I'TS FIXED!!! Kx80 Big Bore Now Rips (Kind of)
Вставка
- Опубліковано 8 вер 2024
- I end up replacing the jets in my 1989 Kawasaki kx80 big bore. I still have to get it fine tuned, but progress is being made on it.
Instagram: 2_vintage_
Website: lap_two on Instagram
Merch: 2vintagemercha...
Thanks for watching and subscribing!
New videos every week!
Hey man just wanted to say I really like how you actually listen and read what viewers are saying in the comments and show it on the video. It’s a better connection between you and us as viewers and I appreciate that and your content!
The problem is you’re riding and not Charlie but keep up the good work
Not a weird powerband that's what a 80 should do go from a bog to holyshit lol she's running much better now
thats how 2 stroke feel low rp dead, high rpm hell a power
Mm
João Baltazar Not big bore 2 strokes. Even 250s have plenty of bottom end.
PC Master Race yes big bore 2smokers are all low end and mid range agreed tons of bottom end power
Luke Combs I was able to get a little more top end out of my 1990 CR500R by taking the engine to get ported by Pro Circuit, and running a Pro Circuit pipe/silencer combo along with a 40mm TE SmartCarb 2. It definitely makes way more power, not like it needed more, I just wanted more. lol
That powerband ain't weird, thats what its supposed to do that. Minis without powervalves do that and they're supposed to.
Make sure your carb has been put together as was, make sure you haven’t mixed up carb parts! I made this mistake, wouldn’t rev up til past 15mph, accidentally put wrong needle jet in
Sweet! No sooner than I toss my 2 cents in on the last video this one comes out. Now it just sounds like it's trying to foul the plug. The burble burble stumble, then suddenly pull and run clean vibe.
I had a 06 rm85 and the powerband was smooth. I also had a 04 cr85rb and that powerband was real snappy and at the end of the power just like your kx80.
Now you can really feel the power of this bike!!
695 Riders these little kx80’s and small bore 2 strokes haul!! I’m about 230lb and had a project kx80 I was working on. Almost kicked me off a few times and I ride a 250 2 stroke for my daily!
I might be getting a cr80 soon!
695 Riders is that your sled in your profile
Keep up the great work, Im glad you got it fixed! Look forward to your videos every week.
First ride big was working nice small bores is always be screamers.....you need like 45-48 pilot.......main jet like 125-140 needle position clip 2.......air screw 1 1/2 - 2 turns outs....then take it for rip come back and check the plug color should be a tame chocolate color........plz short shift the 2strokes u is be holding gears to long so that offsetting your judgment to... on the bike performance......as i told u these bikes love to scream and when u let off the gas they is have you that jumpy gas straving feeling....normal for a 2stroke bud......now tune the carb to the specs i gave u and have fun.....
A real man admits when they are wrong and says "I stand corrected". Stator seems good. Your main jet choice seems good. It was the correct thing to go smaller. Your issue on the pick up is the Pilot Jet. Sort the Pilot Jet and get a new Shift Shaft and you have a quality runner.
Go to 135 Main
Check your spark plug
Text Josh per plug
Nego result
Shut up more gas law
I hope u see this man but I picked up a cr80 having the same type of deal not as bad I took the reeds out the looked the same as yours they had little opening on them out solved my issue
So the reeds looked fine, but you got new ones and that solved the issue?
The 80s bikes did actually have powervalves. It started with Yamaha then Honda with the 2 stroke competitions. I dont know alot about the Yamaha bikes that had it, but I have a Honda 1984 CR125. Thats the first year Honda was testing out Powervalves, I think Kawi had them aswell, you're gonna have to look that up. Powervalves act as another exhaust port, for example, if you're trying to get up a hill, that power valve provides that low end tourque to get up that hill while your are in that powerband. My bike didn't have that I ordered it, but im pretty sure Kawasaki had the same idea. But now they are all built in
Change both crank seals and base gasket. Both are cheap and will help with your mixture issues. Have also seen this issue when the clutch side crankcase seal is leaking.
And that’s the way it’s supposed to run sounds really good
My buddy has a 1988 yz80 and it did the same thing until we cleaned the stator clean the stator you have a bad connection
Definitely to rich on bottom end. 32:1 or 40:1? I would try to lean it out with the pilot screw. The top end sounds pretty decent. Low to mid sounds boggy. Start with one thing at a time.. don't do pilot, needle and main jet and then try it.. Once its warmed up and cleared out put a new plug in and adjust for the pilot. Get it to where you can rev it in neutral and she doesnt hang and has a nice crisp rev. If you're leaned way out on the pilot screw and shes better but not great then put 1 size smaller pilot in it and start over with the pilot screw in the stock position. Once the rev is nice and crisp then start working on mid with the needle.
Also please don't adjust the oil mixture to try and make it not as boggy. You can run any ratio you just have to jet for it.
Hey bro so I searched online & found that the 1989 kx80 had a 132 main/55 pilot jet. The air screw should be 1-1/2 turns out.
We bought a 2003 kx85 & it did something very similar to this. We bought a new expansion pipe & repacked the silencer.. she ran perfect after the exhaust
If the gap on your shifter is completely closed then what you can do to get a better squeeze on it is take it off and get a thin file and file the gap bigger so when you tighten it it will pinch tighter and not slip use to do that to all my dirtbikes back in the day
What position was the clip on the needle on the last ride? It seems rich on the needle. To lean it out, you want to move the clip up, which should drop the needle down. I would try the top most position. If that doesn't clear it up, you may need a different needle. What are the letters/numbers on the needle? I would be surprised if you werent still rich on the pilot as well. If you get those fixed, you will probably end up being lean on the main jet. Get the pilot and needle dialed in first, then focus on the main jet, as those two affect the main jet. Main jets should be dialed in by doing plug chop tests. You can look up how to do those if you arent aware.
The only other thing to add is bad reeds will make it seem like you are running rich (well because you actually are). Did you try flipping the one that had a little gap? It would suck to go way leaner on jetting to just realize its rich because of a different problem.
Just put a new spark plug in it now. I had the same problem and after I went down in jets the powerband was late. I put a new spark plug and it was perfect
If the air screw doesn't make a difference, check the owners diagram and see if therebis an o-ring on your air screw. If there is, take air screw out and make sure the o-ring is there. If it's missing and is supposed to be there that could be it. I've seen this problem before.
That’s the way those little bikes run , zero power and then it comes on all at once . Sounds like it’s running great .
It sounded like it was running fine except for when it was doing the sputtering thing . It’s either your spark plug or mabye your pilot yet to lean
i think you might need to try a 40 pilot jet and 120 main at 1 and half turns on air fuel mixture screw
this is a nice bike
They are meant to have the pissed revved out of them . Need high revs to stay into the powerband.
E3 diamond fires are the best plugs try one and i promise ull love it they make a huge difference
locktite on the shifter screw and splines may help since the bite is diminished
Salut l ami ! Regarde l avance à l allumage (rotor and stator advance), bobine Allumage (ignition coil) and antiparasite and bougie br10eg is verry nice for your cylinder big bore... Sorry for my english, i am fan frensh ! Good Day bro ! 😉 💨 💨 💨
Dude that thing is so close to running perfect the way it sounds I would stop messing with jetting and mess with the fuel air mixture screw and maybe turn the idle down just a tad, in the higher gears it sounds pretty good but first and second are it quite there yet so I would guess it’s only fuel air mixture screw now
I would try jetting especially main jet if that doesn't help it. Try doing a lower crankcase compression test. A compression leak in your crankcase can cause the engine to lean out at higher rev's and cause you problem going into powerband or getting on the pipe.
Finally he learned how to hit powerband! Now just do the same thing on every other one of your two strokes.
My rm 80 use to have the same problem. It was the Eletric!! Check your cdi and bobines
Sounds good you can hear the power band kicking in wants to stand up with you you got just a little bit more to do not much you will have it the way you want before long great bike you have it enjoy watching your videos keep the great work up
I run br8eix hotter iridium plug in cold weather on my sons as standard 10.5 ngk cuts out under hard acceleration, its 2005 kx85, yours sounds lean, i like running clip up from standard leaned out in our 28mm carb as very smokey, not so bad now but always akways use 32to1 putoline mx7 or 9 but most mechanics will say mx5 is fine.
Your bike lovely man, my pal had exact bike kx100 with big nore kit on it could have been 121cc as can be done, was fast he said
Check float level? I feel like changin the displacement would change what your spark should be. and the expansion chamber should be different like size or shape i guess. Im not sure about anything never dealt with a big bore.
You will get it.i have faith in you.
Key thing with the kx 80 the ring gaps go twords the reeds regardless of which side the arrow on the piston is
Based on the fact that the bike was low on engine oil and that the exhaust pipe silencer was drenched in oil, I would guess the crank seal between the crank and the clutch side of the motor is shot. Had this issue on my KTM 125SX and the bike ran so much better once fixed, also jetting hardly made any difference until that was fixed. On the ktm it was possible to replace the seal by removing the clutch cover/right side of the motor case with it still in the bike.
Clean powervalve check for damage also
Well it was a lil better, those things are normally wheelie machines and shooting rooster tails 12ft lol
@2vintage dude put the original jet back in and move the needle up clips not down...down is rich...up is lean...it was rich before...and now that you've went with the smaller jet it runs better but it's too lean.
keep letting it warm up see how it runs then i would check the air flow and do little adjustments on the carb and see how it’s runs
This happened on my 110 I took off the float bowl and rebuilt the carburetor and it fixed it
Looks like they had it set up for a kid so they don’t get too hurt with the whiskey throttle
This thing rips. Keep up the good work. Love your content. Keep it up
I ran splitfire plugs in my kx 80 and it had a 104 big bore kit
Moving the clip down towards the needles point will richen the mixture
I still think it’s that pertruding spark plug hitting the piston and I know that because only Polaris uses bpr9es pertruding electrode spark plugs
Reel Life no they still have clearance. BPR is always an upgrade to br
Vacuum leak on the crank seals check with aerosol cans, CDI box coil failing float bowl level? Check all
Scott Peck I agree on the crank seals.
Make sure the slide in the carb is opening all the way up, and make sure the carb is the correct size, it looks to big in the video, someone may have changed it at some point
Your on the right path. When looking at your choke..... is it seating all the way down? They do have adjustment. Man i hope that wasn't your problem. At the beginning of your episode i got a good look at it. 🤔 but yeah your rich. Does that bike need a oiled filter? Just little tips and second thoughts.
Put a 130 or 135 Main jet in it’s not getting enough fuel in the power ban, also make sure that your needle is in the middle position
Clean out the power valve👍🏼👍🏼👍🏼 it really works
Also what are you mixing your gas and oil too? I would suggest 40:1 that’s a good middle area, if your running any less than that like 30:1 or something then it’s getting to much oil which could cause the rich condition, you can try 50:1 if it’s recommended in the service manual or on any forums but I would try 40:1 as a good middle ground
My yz125 once got a little tear in the head gasket and was slightly leaking coolent on the piston and it had the same exact symptoms as yours
Your right we love the build. I’ve had the same problem and couldn’t tune carb and thought it was something else so I built my 94 kx 80 with all new parts like v force reeds, piston and rings and pipe and all new seals and gaskets cleaned carb a thousands times and no improvements and it’s weird cause it ran perfect than swapped throttle cause I put bigger bars on and it hasn’t ran right since but I’ve been trying to tune jets could you do a detailed video?
Try air screw 1 turn out. Needle clip on the way top position
In one of the videos you richened the clip position on the needle, maybe return it to stock clip position it should help with mid range
80 s are a little mushy on the bottom then hit hard as hell I write a CR85 and all of its power comes on in about 4,000 RPMs and don't stop pulling till I get to the top
if you have a good used spark plug in a other bike slap it in there you’ll be able to read it faster deposit take time to bild up on a new or previously wet plug i would try second clip position and 110 main 1-1/2 out on the screw(your on the right track)
I had a problem like that once with a old 4stroke I would lean out the carb but I kep fouling spark plugs .. finally gave in and changed the ignition coil it stopped fouling spark but still running kinda rich on top end ,so it could be something to consider if u can't get the carb right 😁
Your air and fuel mixture screw used to be 3 1/2 turns out if it does the same put the needle all the way up hope this helps
I bought a 93 cr80r and it did the same thing but once I order the vforce3 reeds it woke that thing up for sure
It’s a two stroke man that’s how they run, definitely mess with the jetting since it’s easily accessible but the power band doesn’t kick in till your way up in rpms that’s why you have to constantly shift, compared to a four stroke
That's one of the dumbest comments I have ever read....
from sound i think your needle and pilot to rich but high in rpms its bit to lean try smaller pilot and lower needle down litle bit im not 2stroke ekspert so i can be wrong👍nice vid bro
Hey buddy been watching what you got going on I believe your problem is going to be exhaust you are going to need a bigger expansion chamber you need one for a big bore kx80
could be somebody has advanced the spark pickup plate to much or could leaking crankcase pressure
JOCKATEO that's what I was saying a couple videos ago I have a kx60 and it ran the same way I adjusted the timing plate behind the flywheel and she would scream again
i have a 1998 Kawasaki kx80 big bore and i'm pretty sure it has a 4 stroke lawn mower plug lmao, we went through two 2 stroke ones that were for that bike but it just kept breaking down.
You have electrical issues. I have had bikes run like that and some needed a CDI and or coil or had loose connection.
It is a bit expensive but u could try lectron carborator its like one of the best it helps with overrev and bogging it will also make it run more smooth. But I'd probably use it as a last resort because the carborator can cost up to $400.
The power band kicking in late may just be because it is bored out because some bikes act different when bored. If you keep going down in the main it might get better tho👍
Getting closer !! Bike will actually try to take 1/2 to 2/3 throttle. Beware though of it being too lean '.
Spark plug sounds fouled
The bike sounds fat down low with a mid range bog. The needle controls a lot of the midrange fuel control, in other words it controls the transition from the pilot jet to the main jet. Might want to take a quick look at the needle and make sure that it is an OEM needle, not one from a so called "jet kit". The taper of the needle controls the transition from the pilot circuit to the main, the clip adjustment controls when the transition happens. I would try a smaller pilot jet and set the needle a bit lower in the main, one slot. Ultimately the engine sounds and acts like it needs a right main seal.
Still running way too rich. Can hear the engine being choked. Might have too keep going down in jets or something. What carb is on it ?
Also think you need to go up on your main jet 122 is the stock size for a kx80 so thats why its falling on its face when you get on it hard might need like a 130 main your pilot jet seems right but if you want to try different one stock pilot jet is 55 for a kx80
That power band is pretty normal my old kx was the same way
Stator needs sourting or wen he did the pip did he put the ring gasket back in or a new one and the rubber one or jetting just out check for air leeks with easy start wen it's running spray it around the gaskets to see if it starts hi reving if so u got a air leek
Try cutting the fuel on off valve closer to the off position that might make it run a little but better in the begging until it hits power band it should bog down then if it's the pilot jet
Check your coolant THE bike not reving out van also be THE coolant mixing with THE gas
Move the needle clip to second or third position, do you know the year of the bike? it will help identify the original jet sizes then you can work from there
I reckon it is your leads because my dad has a gsxr 1100cc and it wasn't running right and it was the leads
ryder goodwing what are leads
Check the cylinder too for chip or a nick of some sort
Lol sweet sounding
Reeds toast ? Chief
Needs a new China carb fir sure
Use iPhone camera to check piston just take the spark plug out turn your phone on video turn on light check it most definitely going to be jetting you can probably find the original carb settings on the internet 👌
Let’s straighten out the handle bars mate
Needs to be wormed up for longer and change the carb to a yz carb as they have a better throttle with the power band
@2vintage the power band isnt catching right you need to set the powerband up happend to my 92 rm125
I would say lean it out a little bit more and that should fully fix the issue of the power being delayed or just really let the bike run and warm up for a while before my yz 85 would do that when not fully warmed up.
Yeah that's all right welcome in two stoke man haha .. vtec !!!!!
Fix the reeds the flow in the engine and this makes it rich
says he will take it easy as he rips the ars out of it!
i would say the main jet is pretty much there but pilot jet is still wrong. you may want to check air filter and check exhaust is not full of oil.
whilst the carb is off look through the inlet port and check there is no oil in bottom of crank area or full of fuel
clean air filter and de coke exhaust.
When it does it want to hit the power band hold it it just needs cleaned out
I noticed on the air intake from the airbox to the carb it wasn’t on properly where the hose clamp is u might have a air leak
Also have you checked ignion timing? The stator is most likely adjustable and may have been messed with. Try retarding it a smidge and see what it dose taking note where it was
Try leak down testing the motor, very easy to do. Sometimes air leaks can make bikes run very weird. Leakdown kits for a 2 stroke are around $15
Make sure the reeds are clean
Hopefully whoever did the last topend rebuild did not put the piston on the wrong way. That can cause major issues.