10 FREE WAYS to MORE POWER in a TWO STROKE Engine! DIRTBIKE/SCOOTER/MOPED | 2 STROKE TUNING
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- Опубліковано 21 лип 2024
- 10 ways to gain power in a 2 stroke engine for free!(or very cheap) You can buy alot of "go fast parts" and you can nerd out on complicated two stroke technology and finicky porting techniques but here is a few simple fast tips that wont breake the bank or your brain!
These easy tricks can be applied to most two stroke engines. Mopeds, motorcycles, scooters, sleds/snowmobiles, boats, rc cars/boats/planes, mx bikes, dirtbikes ++ If your the lucky owner of a East German two stroke car you can even use them on it too.
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If more people would do their (info vids) like this instead of wasting time crowing about their selves to cover the fact that they know little or nothing about the subject, youtube would be much better place
utoobuser206
Yeah, very informative.
+farinrscollective Thanks!
Yeah when i see 10:01 minute video i don't even watch it cuz i know that there will be nothing that i'm looking for.
Welcome to scandinavia. No stupid "Hello how its going" stuff, we like to do things (and speak less), not vice versa.
@@betav47 GREAT! So now i need to move there to get a girlfriend!
Sounds awesome! Less chat more action! Thanks for the heads up
I port matched my cylinder widowed the piston and made my squish gap as small as I was comfortable with had a buddy mil out a stubby intake as short as we could go. Got an mz65 clone and sleeved the inside pipe as shown in the vid and just from those mods I jumped from 26-27mph to 38mph consistently. Using a 40t sprocket and it runs like a squirrel on speed
Years ago i heard about the rc car fuel trick from a riding buddy, he would use it in races with his 125.
Fast forward about 20 years, i bought a house with a bunch of dead trees.
I spent a little too little on a 50cc chain saw that did not quite have the power to make it through some logs.
Remember the rc car fuel trick, i tossed maybe a little too much into the chainsaw.
It worked like a charm!
I made it through the last few logs that i needed to make lighter, but the engine got super hot, it would not shut off, ended up choking it with paper towels and water and finally got it shut off!
I'm pretty sure the spark plug was acting as a glow plug at that point lol!
The little husqvarna 50cc engine survived, and i ended up doing some slight modifications to the exhaust system that then allowed me to run the saw much richer, that then allowed me to run a little nitromethane in the fuel.
Here in the states, we can get 100% nitromethane, but it is a "watched" item...
I now run two large capfulls per 2 gallons of 40:1 premx in all of my two stroke equipment.
I love that nitromethane idle growl it gives everything!
.....so there wasn't any ring damage from the overheating? I think a sthil would have gotten ring damage .
I once got my 125 2 stroke racing bike so hot that it started dieseling. I pulled the spark plug boot off and it kept running. It turns out I ran it with no coolant for about 20 minutes... fail
You had me at cheap"-
Squeezing every drop of horsepower out of it,,, when almost detonation , back off a lil bit. Lol
if youre just after power for short periods of time thats how to do it
Awesome stuff. True quality content, no fluff. That's what success in any project or engineering situation like like - got to do the due diligence
great video man! quick and straight to the point, I like it. Think I'll set up my next build to run nitro. I have run 99% isopropanol mixed with 2t oil before, just to get to the gas station. Definitely more power, definitely a different smell and sound.
+Kosmoto Thanks! Do it!
Its could be a stupid question... my english is maybe not so good.
But...that ring you put on the cilinder, where's that for?
@@marcello033 to raise the cylinder in order to get much more aggressive port timing. Measure first and decide if there is enough to gain. I go up to 170/122/155 degrees port timing for cylinders with piston controlled inlets. This is fine for 50-70ccm
Very nice advices i only knew about a few before ur video! I can also add a bit of my experience to the preparation of the cilynder ports into the engine block. Many smaller 2 stroke blocks have very small wall thiknesses in these areas. You can just take your caliper and stick a little drill to it (f.e. just with duct tape) and you have a great tool to measure all the smaller spots of wall thiknesses you are about to process without buying expensive instruments.
+P33TMusic Thanks! Great tip!
Thought you were going to talk about stuffing the crank.That was a thing back in the day.Don't know if it still is.That's where you fill in all the holes in the crankshaft with some lightweight materiel,like cork or foam,then epoxy over it to seal it. I did it to my '76 360 Husky,and it made it almost as much of a torque monster as my friends YZ400E,and I could still smoke him on top end.That Husky was blindingly fast.
I was told by an old school two stroke tuner that he done similar in the piston, cramming cork inside it above the wrist pin, do you think this is likely to do a similar job or worth trying?
most modern moped cranks in the aftermarket/tuning segment do have either aluminium ore plastic filling to not lose crank volyme.
I made good power on a lot of 50 and 70ccm Mopeds with 40-45mm Stroke with a gap of 0.7-1mm from the Piston to Head. On my Daily Driver i ran a gap of 0.45mm wich was insane but it started to ping a litte at about 30mph (Stock Puch maxi wit 18mm Pipe, 12mm Carb and 1.2hp Cylinder, Stock topspeed of about 20mph)
Awesome video! I love all the pro tip stuff. You should go over all the mods you make on your engine when it is complete.
+FORCED-INDUCTN Thanks, I will!
I am one of those lucky owners of two stroke cars. I've been following your builds and films. I sure wish we could talk. I figured out how to make great 2 stroke power reliably from 2500 -to- 4500 rpm. which is really good for a heavy car that needs torque. However at the sacrifice of top RPM. I'm frustrated with the power cut @ 5000 rpm. And want more top end. It'd be great if we could chat some how or some way and send me in the right direction. Thanks Mark
+2stroketurbo Sure, send me a mail on 2strokestuffing@gmail.com You know I used to own a Wartburg 353, really miss it. Need to get another one and tune it!
Time to start messing with gearing?
Port timing and a proper exhaust can make or break a 2 stroke. And since you probably can't or won't want to mess with port timing, experiment with different exhaust setups. Problem with 2 strokes is you can tune them to operate best in certain rpm bands, but all other areas will suffer for it. That's the nature of the beast.
when are you finna start tuning am6 and Derbi motors. i bet youre going to be the best if you pur your mind to it!
Drill a hole in the stinger, weld a nut in line with the hole and screw the bolt in to tighten it up. Us a jam nut as well
If you could show am6 engine tuning, that would be gold💪🏻
You're better off getting 70cc sport kit and a new carb for your yamaha dt because if you tune the stock engine alot the power will be at really high rpm and its not that nice to ride on the street the 70cc sport cylinders have way more low end and high end power than a 50cc cylinder
AM6 motors was 2 stroke last time i checked ;)
Do what he said in this video. But make sure to thorouhly research every single aspect of it through other means before you do anything. You do not want to explode your engine.
If you want the quick and easy way to gain some exstra hp out of it and have some cash to spend, look fore a 70cc big bore kit and a new crankshaft.
But the cheep and easy way he mentioned in this video, get a new main jet in the carb. Changing the stock air filter for a high flow/power filter propably wouldnt hurt eighter.
And again, follow the tils in this video, just make sure to research it alot first and read as much as possible about how a 2 stroke work.
Good luck to you my friend 👉
@@laurisorvari4981 thats boring you whant it to rev high that will be much more fun and nobody whants a 4 stroke power curve on a 2 stroke
@@laurisorvari4981 in some places people are stuck with 50cc bikes until they're older :)
80cc pink top cilinder with a doppler crank and a 19mm ali carb
Nicely done fella, keep up the great work too.
Man I've had so much of that rc fuel in my times I never though once to put it in the ol 125 though considering I usually have 110 octane gas in it but I did run a little but of that mixed in my 1/5 scale rc truck and it loved it
Would like some of this back to basics stuff again
Stinger outlet, basic rule (Jennings rule) do not reduce the outlet size to any less then 0.58 times the cross sectional area of the header inlet pipe, that's area not diameter. Any smaller may melt a hole in the crown of the piston. Fact is the exhaust inlet size does not always correlate to the actual port size or volume of gas coming from it so that rule is pretty fluffy but its a start.
To do it with any degree of accuracy you need to have CC temp and EG temp.
First sign is a light ash on the piston crown you can see through the plug hole with a torch, by then the piston is dead but if you replace the piston then at least it wont hole out causing damage down below and mashing bits of it into the cc.
+AuMechanic Good info!
I would say, tune it with a pressuregauge.
0.3bar is quite good pressure in the belly.
+Patrick Wetterskog That's good advice!
If you are prepared to weld a pressure tap in it that's a good method to use. Just watch the CC temp whichever way you do it.
I sanded my head unroll I had 135psi compression and it ran too hot. I backed it down to 110psi and it ran much better than the stock 100psi I had on a new scooter. There was still .07 mm left in the squish band. I used lead solder to get my squish measurment.
Brilliant vid, can't beat a small bore 2stroke and nerding out an extra 2hp. Men in sheds tuning. Win.
+Dave Spooney Thanks! Cheers to nerding out!
Hello, I have a problem, I have a Peugeot Speedfight 1 100cc that recently seized up/heat seized. It was not tuned. I then changed the cylinder, piston etc. It now starts up right away, but after a while it dies all of a sudden (as if you had turned off the key) and then I can start it right up again, this usually happens when I go over 60 km/h or uphill.
When I changed the cylinder etc, I also cleaned everything thoroughly, such as the carburettor, intake, new air filter, new fuel filter (there was no fuel filter before) new spark plug. I also removed the oil pump and put a metalplate with a gasket over the hole instead, I now mix the oil directly into the gasoline.
Some other info that might be important.
- When I drive over 60 km/h, it starts to make a noise from the variator (CVT), it´s sounds quite a lot.
- When it died, I tried to start it again while it was rolling and then it started right away, but it made a noise from the variator, like something "let go" that had been seized up, like a rubber sound, maybe from the belt.
- The variator belt touches the variator cover on the inside and has grinded a cut in the metal.
- In the variator, where the weights are, the belt does not go down to the bottom of the wheel.
- The clutch bell had turned blue from the heat.
- The place where the connecting rod attaches to the crankshaft had turned blue from heat.
- There was no fuel filter on it before. But i now saw there is an internal fuel filter in the gastank, can it affect the vacuum if you now have 2 fuel filters.
Please help me.
Regards
Andree.
I have the 2017 ktm 150 xc w I went with the lectron carb v fore reeds and RK Tex head insert carburetor much more responsive in a little bit more of good power all over was the result
Sounds like an excellent mod list.
Thanks! Great video again!
I did a lot of these and have a badass mower.
Very good video! I love learning about 2 strokes since they are different from 4 strokes. Do you have any recommendations on how to make a good exhaust for a 25cc weed wacker / trimmer?
Now this i liked.
Got the barrels of my kr1 nikosil plated and ported.....cost me a fortune at the time but cheap compared to today.
Miss that bike so much...especially when i see hiw much they are worth now....was in a dark place and gard times and sold it for 500😢😢😢
Think i need counciling🤣
Which variable ignition time system do you use? I need one for my highly tuned 55ccm 2-stroke moped.
how about exhaust wrap,bigger carbs,lightened parts like piston-flywheel, remove oil pump-kickstarter mechanism to reduse friction looses,make the reed stops wider to give more open area and maybe put carbon reeds?
+kostask18 All stuff that can help, I tried to pick a few that weren't that common.
I really do hope that in the future one day? You take a comon leaf blower like the Ryobi at 38 cc and go into how to improve it or sell a kit in the future.
👍 Søker motorsag trimming og den første video er norsk 😀 knallbra, keep it up.
The stinger size is interesting just changed the pipe on my huffy the new pipe looked larger but seamed to be down on power but at the same time swapped from 44t to 36t so assumed it was the gear change will look into it and see if I can recover some power
derk nobit put the old sprocket on it and see if you have got more power. You should do things one at a time to find out what works and what doesn’t
RideSouthWest ya should have but didn't.
derk nobit yeah haha I’ve done the same many times. Just things you pick up when tuning engines and stuff
but it gonna reduce the torque
Hi ! There was no mention about jets ; for instance, in a Vespa 90cc , the Dell Orto original Main Jet is 63; replacing it with a 65 or 67 Jet, wouldn't produce more power, without affecting reliability ? Thanks , oscar
Curious why I do not see more videos from you working on larger displacement bikes like the motocross in the back of this room . You seem to do great work and would be interested to see how much power you could squeeze from say a rm 250 or a cr 500 .
Small CC bikes keep the cost down. Everything is relatively cheaper than mx bikes and the same principals apply. Theoretically all mods would apply to larger CC bikes.
Could you do multiple videos go more in depth for each of these
+GOONCITY I'll put it on the list!
2STROKE IS LOVE
Yes!
Is posible put this recomendations in motorized bicycle 2 stroke?
Nice going to do all this to my kx 80 with big bore kit
Thank you by the vídeo!
Dude you rule! love your channel
Thanks man!
you are the man!!!
Oh yeah...you're the man!
+utoobuser206 Thanks!
Great video.. You know of a exhaust mod cheap i could do on a 1996 Polaris trail boss 250?? Thanks.
Long shot but would you know best roller weight for a speedfight 50cc 2t all standard apart from stage 6 viriotrator
Could someone please explain whh a smaller exhaust makes more power? Is this due to higher exhaust velocities increasing exhaust scavenging?
a smaller exhaust will not make more power, but i you decrease the size of the stinger (the pipe after the expasionchamber) you will have more backpressure but you engine will overheat more quickly, as far as i know
on a piston port engine figure out which skirt on your piston is the intake side and cut it as short as you can. that keeps the port open longer and thus more fuel. then on the exhaust side run the piston all the way to top dead center and mark the bottom of the port on the piston then remove the piston and cut the skirt of the piston off just about a quarter inch below that mark.
"as short as you can" is very dumb. If you take too much you will lower the speed of the transfer ports as some pressure will go back out the carb
@@KalLanPIDT only doubled the hp on a kt100
I have a dt400 I ported it by widening and raising the ports. The pipe has a flat crude reflector plate in the wierd shaped convergent cone area. No cone really at all. Do you think removing that plate would make more power. Also there is sound deadoning material in there that must go.
Legend cheers mate
You can use a 2 stroke engine as a Stirling engine, just put it up side down, apply heat on the head, plug the holes.
Thx man
What ratio of 2 stroke oil to fuel would you use when running nitromethane methanol?
nice video but lifting the block with spacer ,needs the port timings also to be changed as well
I am wondering what would be the effect of 2 tesla valve on a two-stroke, one at the intake flowing forward, and one at the exhaust (smaller than the intake one) counterflowing, to have the effect of back pressure right back in the cylinder. Would the intake valve flow be accelerated by the pressure built in the cylinder ? Does anyone have an idea ?
With the optimax RTR20 do i have to mix with 2stroke oil
Husqvarna CR 125 2012 som står bak der? Så fryktelig kjent ut! :)
your videos are so cool
I'm big fan and watched all your video's . just wondering how i can tune a Suzuki AX100 to the maximum performance , i would appreciate your experience in this
New sub. Good content. ❄️ thank you from Alaska
What engine should i use to build a small scale bucket wheel excavator with about 100lbs torque, how much torque can a typical 2stroke bicycle engine output?
U are the best , sir
+Humanoid Thanks!
3:23 is there a point of using a combination of base cylinder spacers and port job at the same time?
Great video man, quick and to the point..
+Motozing Thanks!
If you raise the cylinder you increase the exhaust port duration but won't you decrease the intake port duration? Won't these two changes offset each other?
Can use rc fuel for 2 stroke??
but if you lift your cylindr to increase volume, but also tske of the same at the top, than the volume stays the dame right? so what are the gains for this then?
Sir, I need such a help. I want to ask about the port of such a cylinder, how can we increase the speed from its port. Please help me. Please tell me.
In the 80s I throw in some home distilled boos at 40% together with the gas. It didn't work, probably since it was made for drinking and had orange juice with fruit meat in it... ;)
@2STROKE STUFFING
Can I use your tricks also on old 2 Stroke Outbord Engines for Ex a Yamaha 55 PS?
yep
Great video. Can you recommend any books for the beginner to the advanced two stroke tuner?
AZ0960440 two stroke performance tuning by Haynes
awesome vid bro
Thanks!
any time bro.... i do pocket bikes for my vids ...would love to see how fast you could make one go
Does rc fuel have any problems with non castor 2 stroke oils? How about needing to drain the fuel system between uses (like alky drag cars)?
+ludditeneaderthal yes it does but some synthetics and ester based works. You need to "purge" the system after use just like with alky drag cars, methanol is corrosive and hydroscopic.
running methanol and nitro you need to go almost 3 times as rich as you were on reg fuel then come down a bit till she starts running warm n go up a hair !!!!
gonna cut up my leovince TT in a moment... now that i know it i cant put it back there... hated the welds anyway
Does pre detonation not happen with high compression??
Love it
My 2 stroke engine is from IAME (I don't have any vids of it yet, didn't consider recording any videos regarding that engine, and it's all the way in Florida), 60cc race TAG kart engine. That sandpaper method might work though! Thanks!
No need to sand it. The head of IAME 60 cc engines have a copper gasket in it. Removing the gasket will increase power.
@@davidgutierrez3312 Huh, okay. But won't that likely kill reliability as well?
@@LukeAsOneRogue More heat and more revs.. so you'll have to do maintenance sooner. Instead of changing the piston after 100 hours you'll change it after 80 hours.
Even better: changing the exhaust restrictor for one with larger diameter will improve performance too.
Those two modifications wouldn't ruin the engine and make it perform like a water cooled X30 Mini.
Those engines are made for young kids (5-7) competing in karting in Europe and come with those restrictions to limit power, but can safely be removed.
@@davidgutierrez3312 Okay then. Thanks for the tips.
Hey my friend
I have a question, i installed a 70cc Zylinder kit and when the piston is in the lowest position it does not open the exhaust port completely like 3-4 mm left to open completely... but the squish is ok like 1mm
Can i grind the piston on the exhaust side a bit? Or what can I do?
Thanks
I have heard that you can but it's best if you don't go more than like one millimeter maybe two I think your best option would be to raise the ceiling of the exhaust Port but if you're doing that you have to do the same thing to the carburetor side except on the floor
Have you tried Amsoil Saber 2 stroke mix? As it allows up to 100:1 ratio it could well have power benefits.
I've used it in my sihl weedeaters and chainsaw and haven't gotten any noticable power gains.
i need to make a adpter plate. from 66cc motorized bicycle engine case to ts400 cylinder . i need a plate 6mm thick. any help would be great
Frank lol
Just build a 660
Hey how would you recommend making the intake shorter? Shave rubber boot down that carb mounts to? Sand Reed block down? Please help!
Probably he.meant to get rid of the gasket between the Reed.block and intake. I think it really might help with primary compression.of the crankcase as well as what he said about gaining response in.the intake tract. Not.really too much power to be.gsined on the top end power, just response.i am thinking. Good luck. Also, I really do think the best thing he said was the closing of the.squish band of the head. Always check that your compression is not to high to run pump gas. On my 400 dirt bike I run 145 lbs compression and so far no problems.
In the old days you just had to replace the head gasket with a thinner one to decrease the squish band but shaving a bit off the head is probably just as effective
But inserting ah spacer on the base modify the powerband curve. IT depends on your demand
What's a good pipe for honda dios
Thanks I’m going to try the smaller exhaust stinger on my tomos 65cc 😎
Great name :D
65cc did not exist, but did you get any power on it?
yes for sure that modification is usual here but is wrong, you get torque for riding with two but loose all higher rpm, and all these videos are about high rpm power original piston is 38mm and up to 39mm is 50cc (if we want to be in 50cc class)
forgecro pretty sure exhaust flow is what matters.. If you can go just as fast at 10k why bother going to 12
Great! 2 questions. Squish band: why don't the manufacturers design this in to start with?
Reduce internal ID: How does this work? why does it increase the chance of detonation? I understand the basic concept of pipe design...
Bigger squish band clearance means they don't have to be as precise when machining the cylinder, head, piston and rod. Precision is expensive.
how many cc is the husqvarna in the back?
What's your opinion about boost bottles?
Hi,
What are your thoughts on a full cone pipe compared to a stamp pipe.
With all the increments does this help exhaust flow of a cone pipe not only they look good for more performance.
This is for a Honda cr250r 2stroke dirt bike
Thanks again and keep up the good videos from Australia 🇦🇺
+Andrew Byrne It depends on how well the cone pipe is welded, and how "sharp" the stamped pipe is. Sharp, clear transitions between the different pipe sections = sharp pulses. This is the downside to hydroformed pipes - the transitions are kinda smeared and this smears out the pulses too.
2STROKE STUFFING So it’s actually better to have distinct transitions, not a smoother “flow”? Not doubting you, just trying to learn a bit on expansion chamber selection.
Hey Stuff, Is the RC fuel already mixed sufficiently with oil, should it be used during break in period? If so should more oil be used?
Years ago, there was an aftermarket gizmo called "Snuffernot". It was basically a washer mounted in the end of a straight pipe on a 4 stroke dirt bike for the purpose of running it in town, I suppose; to keep the noise down until you could reach the boonies and open it up. It was installed on the end of the pipe like a butterfly in a carburettor. It had a knob on the top and it could be pivoted to be open or closed or any place in between. I suppose something like that could be mounted in the end of the stinger to "tune" it?
Gp bikes actually have a butterfly valve in the exhaust system to tune the exhaust
It usually has like 9% castor oil, methanol RC engines always spit a bunch of oil out the exhaust.
does this work with the motorized bikes
1% of your stroke , mine shows .4mm of of squish required, is it safe? planning to use it on my 106cc 2stroke engine meant for short run(201m)
Very cool channel
Please build a small 9.9 evinrude/Johnson outboard they have becoming very popular in small boat racing I would love to see a build
Im running a 9.9 Johnson from 1977 and its a beast.
I run it on 20% rc fuel and make sure you got a good propeller. Also upjet it.
Usually thats enough to smoke most people.
Hey bro i have one question. For racing crankshaft should be light or heavy in 2 stroke? Please help me I will wait for you answer!
+Fayyaz. Mad. Heavy is my advice, or more specifically high inertia. But some disagree, the jury is still out.
Sir i have two stroke cylinder i want to increase its power,rpm please help me how i can increase the speed from its ports. Please help me tell me sir 🥺😕
When tightening the squish band you need to replace the gaskets or adjust the gaskets to make up for space?
you can lower squish clearance by running a thinner gasket or by milling down the head
At 0:59 you say if: if you insert de-restrictor it will increase power... i think you mean decrease power, more exchaust and air will Flow thru without it and you need to put a bigger main jet in.
Can you please show me how to make a on/off speed limiter i have tried every tingh. Maybe some tingh dath blocks the air way
Best way is to retard ignition timing
When I was a kid (early 70s) we stuffed our 2-stroke crankcases to reduce volume and increase scavenge pressure. Is that still a practice?
Hej, jeg er fra Danmark. Har et spørgsmål du måske vil kunne svare på? Eller skal jeg skrive Engelsk?
Det om squis gap og karburator for flest HK 🤔
Jeg kører 70cc med stroke på 39.90 (40mm) - squis gap 0.39mm nu.. vil 0.2 være bedre?
Og er en 32mm karburator bedre en 28 for flest HK?
- Tak :)
what does he mean about portmatch? could someone simplify it for me?
Missed out one obvious tip..... make sure the tyres are correctly inflated, especially on 50cc bikes as under inflated tyres will take a bite out of tops speed.
Another "old school" porting method, from back in the 1950's and 1960's, that's even simpler than adding a cylinder base spacer, is piston head edge indenting.
I bought (and later sold) a late 1950's Jawa 250 competition motor, back in the mid 1980's, and the only difference between the stock road issue piston and the competition motor's piston was the indented "ramps" in the piston head to increase transfer port duration.
It kind of makes better sense than butchering a cylinder block. Porting mistakes only cost a replacement piston compared to ruining a cylinder. Also back then it allowed the motor to have a selection of indented pistons tailored to suit different circuits and race conditions.
I've been recently experimenting with an indented piston on one of my son's 2 stroke road bikes and managed to go past the "just perfect" into "f**ked the port timing" BUT it only cost me a replacement piston and redoing the indents back to the "just perfect" dimensions.
I could, of course, port the cylinder block out to the dimensions used on the indented piston and use a normal piston again, now the measurements are know. However once ported a cylinder can never be put back stock, unlike running with modified port duration / timing using an indented piston.
+Andy Reid Good tips!
it is hard to do so if you have piston with L-ring!
@@jozseffarkas1767 take a die grinder using a blunt foot ball shaped carbide but and remove all the imperfections inside the ports left from factory casting until you have resurfaced every square centimeter of all the ports without cutting clear into the cylinder bore ..but match up the exhaust port as big as necessary to the pipe adapter and the polish it to a mirror finish ..and nothing else ..you with feel a bike length jump ahead of a stock bike of the same after a jet size bigger for the carb and a higher flow air filter like a "twin air" brand foam filter and perhaps a FMF fatty tuned expansion chamber or a Yoshimura tuned pipe if you got the bucks ..cause no body ever out tuned "pop" Yoshimura who I spent a week with in a two stroke tuning school on the Honda Elsinore as it was "pop" Yoshimura who designed developed Honda's very first two stroke engines ever made ..that was the game changed from that moment on ..as "pop" taught me everything there ever was or ever will be about tuning port induction two stroke engines as to how they make boost , horsepower , power bands and the essential of a tune expansion chamber ..as so far none of you in these comments have not a clue ..including the video ..
I used to run my kdx on 20% rc fuel. Big HP gain.