Aprilia RS 125 | Dellorto PHBH28 Carburettor Basics Part 2 - Roadside Tuning.
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- Опубліковано 2 січ 2022
- Thank you for watching Tom Did It.
In this Part 2 I complete some road side tuning on my Aprilia RS 125. This Dellorto PHBH28 carburettor comes standard on the later model of Aprilia RS 125.
My current Dellorto PHBH28 SETTINGS are:
Fuel screw - 2 3/4 turns out.
Needle - 2nd clip from top.
My current Dellorto PHBH28 JETS are:
Pilot jet - 60.
Emulsion Tube - B40.
Needle shape - X2.
Mixer tube - BN266.
Main jet - 125.
Float needle - 250.
Choke jet - 70.
Thanks again, Tom Did It. - Авто та транспорт
As an Rs 125 owner im so happy to see these videos. Very informative and helps me to tune my bike for next summer season. Thank you and keep the channel going.
Thank you for your comment!
Glad the videos are of some help.
One of the best carburetor tuning videos ive seen!
Thank you Juho!!
I have also had people stopping to check if i'm ok when I had standing on the roadside for adjusting carbs! It's a good thing of course, there is still some hope for humanity :)
And I have been taught for about 30 years that you count needle position from bottom and up, and I think it says the same in Dellorto's documentation. So it's a good thing that you wrote that you count from top so people cant get confused. I'm currently fixing a friends RS and this video was interesting for me to get some settings to start of with. But I live in sweden so climate differs a bit I think. But the bike has gone from undrivable to be pretty much as yours is in this video. Last 125cc 2-stroke I drove was a RD125 many years ago, so testing the RS was fun. Biggest difference is no doubt the handling and brakes! It's like night and day :) No wobble and sway here :)
This is quite impressive to see u tune it roadside as I just use the dyno for it , nice to see the old proper way of doing it being used for once ahaha good job mate
Great video thanks for taking the time and putting the effort to make it
Very good video I have been playing with 2 strokes for over 20 years and that was a great clear video spot on really well done and clear
P.s nice to see these bikes looking in great condition
Hello. And thanks for your comment.
It nice to know that experienced people like you think the content of the video is ok. I really appreciate the feed back!
Im really lucky to have an RS in such good condition. What do you ride?
Man.. you're the beast. Thanks a lot for this lesson, it will be very helpfull!
Tom great video it's really good to see modern videos on the rs 2t
Very informative and lovely looking wether out there don't think it's stopped raining here for about 3 month's 👍
Hi David.
Thanks for your continued support on the channel.
We’re in summer now so may make some riding videos. Show people around Sydney (if anyone is interested).
The UK weather can be terrible at times mate, especially at this time of year through to March/April.
Thanks again.
Tom
@@tomdidit4216 I'd love to see more riding videos and blue skys for Shure
@15:40 : The structured way of opening and closing you underseath compartment is more structured than my whole life
greeting HJ D
I had to rewatch it. Very methodical indeed…. 🤣
Otherwise, I hope the video is of some use👍
@@tomdidit4216 Yes it is! Just bought a RS125 as a hobby project with 18k km. Will be driving it a little this summer and then it's time for a rebuild/engine revision. Will be only driven a few times a year, more a looker than a driver for bikes. And the Spains No.1 is one of the best bike livery's out there I would say
Nice!
Good luck with your project👍
Wonderful Job Mate! should have known this years ago
Howdy Andrew.
Thanks for your comment.
Glad the video is of some use to you👍👍.
Cheers,
Awesome video pal!
Cheers mate. Glad you like it.
But seriously, what idiot puts an 8 in a 9 box?
Answer: Tom Did It😂🤣😂🤣.
@@tomdidit4216 happens to the best of us🤣
That tank support is a great idea
The little metal stick comes with the bike as standard.
Hope you find a suitable RS bike soon👍
Happy hunting.
Happy New Year Tom!! Bloody hell that thing is a weapon!! Mate you should open up a mobile mechanic business for bikes!! Nice video mate we’ll done 👍
Howdy Nick. Happy new year to you mate.
Don’t think I can tune it any more - she’s gonna blow…..😂🤣😂.
Glad you like the video mate. Take it steady👍
Great videos mate
Cheers mate👍
congrats
Excellent video's buddy, clear calm instructions, good editing, top job man. Where are you based? Looks lovely?
Hello and thank you for your comment.
Glad you like the video!
I’m in Sydney, Australia. The warmer months are upon us now so will hopefully make a few more riding videos👍
Do you ride Suzuki?
@@tomdidit4216 thanks for the reply man, yeah got the Suzuki in my profile pic, am restoring a 1997 rs 125 so your vids are great !
Ok great.
I have 3 other videos backed up on my computer so look out for those👍
Cheers
very good video, im probably going to buy an Aprilia Rs 125 2007 as my fist motorbike
Hi Mattia. Thank you for your comment.
The RS is a great first bike. Good power, light weight and smells good 😀
Good luck with your purchase!
Tom
Btw Tom.
Can you do a video on your phone mount and charging for your phone?
Regards :)
Hi mate, I'm looking for my second bike and have ridden a 4 stroke cafe racer before. This time I want to get a sportsbike and was wanting your opinion on the 2 stroke rs 125 and how it handles as a commuter aswell as a wee racing bike around the streets aswell as maintenance expesnses etc. Thanks
Thank you for the lessons!
Now I'm mad at the algorithm for recommending this to me only after I took my new to me 1986 Garelli 125GTA (my first ever 2-stroke, a bike that had sat for years, just 1600km on the clock) for a ride, only to kill the engine in 100km because I didn't do a proper check of the shitty rubber between the carb and engine...it had cracked and killed the engine. No replacement cylinder and piston to be found anywhere. And because I was not aware of the symptoms of an air leak there, nor the consequences. 😢
At least now I know. I hope others see it and educate themselves before they kill their bike like I killed mine.
Cheers!
Tsvetan, thanks for leaving a message.
I had to Google this bike. It looks fantastic, and what a great find with only 1600km on the clock!
That’s bad news about the air leak my friend. It’s a common problem with old bikes, regardless of the mileage, the rubbers seals throughout the bike start to harden and deteriorate. As I found with my low mileage 2010 Aprilia, the engine is not mechanically worn out, but the seals need replacing.
Not sure what to suggest with your Garelli…. Is it badly damaged? Bent rod, piston exploded, scared barrel?
Good luck 🤞 finding the parts
Tom
@@tomdidit4216 Both piston and the nikasil surface of the cylinder are scratched. The spark plug was melted. I'm told there's a machine shop a couple of hours from me that specialises in this sort of engine repairs. Cylinder machining and matching pistons. I hope they both can and will agree to rebuild it! I saw the bike and immediately loved it so I hope I can revive it. Those 100km before its motor seized were a great and very different experience from my 650 Transalp, '19 S1000R and other 4-stroke bikes I've been on.
Cheers!
Update: They can't fix a cylinder with ports as the ones on our 2-atrokes so I'm stuck until I find new parts. 😢
Full power
Spillo Conico X25 3° tacca dal basso (da acqustare se non presente)
Valvola Gas 50 (da acquistare)
Getto Emulsionatore minimo B65 (da acquistare)
Polverizatore BN266 (da acquistare)
Getto Avviamento 70
Getto Massimo 120 (da acquistare)
Hi,
very nice video, mate. It helped me a lot.
But i have a question. Which Gas Valve do you use. I think it should be 40 or 50 in your case.
Hi m4
I use 98 premium unleaded. Seems to do the job👍
Thanks for watching and commenting
Cheers
Tom
Hi, what main jet are you using? I'm currently struggling with main jet issue. Read that in unlocked version main jet should be 128 but i can't get bigger than 115 beacuse engine just won't go over 8k. Any ideas?
Hi there Maester.
In the video I’m using a 125 because it’s suit the weather and my riding conditions. I tend to swap between a 120 & 125 main jet depending on the season.
I once tried a 128 main jet however it caused my bike to run too rich, bog and drip oil out of the exhaust.
Maybe try the 125 main jet and see how you go.👍
What did you have your air and fuel screws set too as a base line? Thanks
Thx you the best 🤜
Hope you like the video Mecenas.
Thank you for the comment!
Tom
hello, what phone mount or holder do you use? looks solid
Greetings Andrasik
Sorry to disappoint, but it’s actually a knock up job. I drilled the back of my phone case and cable tied the phone to the handle bars.
I would not recommend doing this as the image stabilisation on my phone is breaking, and I think this caused it.
Thanks for the comment.
My rs125 has just passed its mot yesterday 😊
Awesome stuff bro my bike keeps blowing out spark plugs it's really boggy when pulling off but once it's gets going it's fine it's just in first when pulling off and I'm guessing it's a bit rich on top end aswell
Anything i can help with
I have aprila videos on my channel about idling problems
hi any idea why turning both screws on my carb whilst running dont change the revs at all? also if i give it a big rev in neutral
and release throttle the revs come down and then dies? cheers
good video but you really schould use the ngk br10es or similar. I was wondering that you changed for a 9. That sureley will damage the engine and influence your performence in longer use!
Hi Martin. Thank you for your comment.
My Aprilia work shop manual recommends 8,9 or 10. I believe the 10ES is the coldest operating plug and is usually used for racing. As they burn colder, they are great constant wide open throttle conditions. As the plug number decreases 9,8 they operate a bit warmer, with 8 being the warmest recommended plug (according to the manual)
I found the 9 is fairly cheap and works best for me.
If your bike runs best with a BR10ES, continue to use it👍.
Thanks again for your comment and for watching.
Tom
@@tomdidit4216 Hi tom, ok honestly i didn´t know that thing with the manual :-) maybe depends on the type of fuel, aprilia recommends 98 Octane fuel= best 10plug. For my part i prefer to run her like that to get the best power ;-P wish you a good day and ride my friend!^^
hi I noticed this video, my bike starts to accelerate by itself without opening the throttle. First it starts to stay at 2k RPM and when I accelerate it tightens to 6k / 7k RPM. could you tell me the cause of the failure? could it be the throttle sheath or the screws didn't screw well?
Hi there.
It sounds like your getting a lean condition.
Try something - the next time the rpm goes high, turn the choke on. The rpm should settle down as the choke will richen the mixture.
Hope this helps👍
Tom
Fährst du die Maschine "offen" oder gedrosselt? Will meinen Vergaser auch demnächst einstellen.
Hello for some reason my aprilia rs 125 is boging when i twist full thorttle and it hardly gets to high rpm i tried turning the fuel screw and turned it out like 5 or 6 turns out and then it gets a little better...
I want to change my original exhaust for a gianelli. Which jets should I get in order to set up my carburettor? and where? do you have a link?
Hallo, great video 's
I have a tdr 125 with the same carb. After cold start it stays running like it is on choke ( hand ) but its not. I can see and feel the choke plunjer going up and down. After a while , sometime short or long ( 10 min) the bike runs great, snappy like a 2 stroke should be and go,s to the red line in every gear. Do you have any idea where to start looking. Already changed the crank seal at the oil side. Thanks
Hi Wietze.
Thanks for your comment.
I’m experiencing the same problem with my new carb.
I am checking the float plunger make a tight seal using compressed air. Also constantly adjusting the jetting and float levels. My similar issue is still not fixed but will share any diagnosis on my video.
Thanks again
Tom
@@tomdidit4216 okay thanks. I think iff it runs good at one point the jetting is oke. I only did 1 size up from stock when i fit a gianelli exhaust. I think i order a complete gasket set and clean and rebuild the carb and try again.
Good idea👍
@@tomdidit4216 rebuild the carb with new seals. Adjust the float level. After a few runs it is still good. Starts good and when warm it runs great in every gear. 140 km/h at 10.5 k
Hi
I’m just waiting on a B36 pilot jet. Unfortunately it’s taking a while as it’s being delivered from overseas.
My next video is ready, all but this tiny component and tuning.
Sorry for the wait guys!!
Hey man I have a Aprilia mx 125 but I have a problem I start in 1st gear and let go of the clutch it does give full power from the begging how do I get full power from the start what’s wrong with it can you help me
Hi Tom, just recently purchased a rs125 when revving the bike I’m noticing a vibration coming up through the petrol tank/handlebars any tips on what this could be? I was told engine was rebuilt only 300 miles ago? Thanks Andy in the UK 🇬🇧
Greetings Andy.
These bike do tend to vibrate a bit more than modern 4 strokes.
Excessive vibration could be one of many things….
You mention the engine has been recently rebuilt - I’d suggest checking the engine bolts are tight. Worst case, the bottom end may be worn out?? Otherwise, I’d have the mechanic check it over.
Good luck 🤞!!
Tom
@@tomdidit4216 Thanks for your reply Tom, yesterday was the first time I have properly had the bike ticking over, it seemed quite sweet, but things like the air box and the petrol tank were very loose which I tightened up, I’ve been told the bikes been in storage for around 8 years before being recommissioned maybe everything is a bit rustic? next week is the week where I’ll be riding the bike properly so I’m going to see how it is out on the road, I’m going to have another check over today and see if the engine bolts are tight as you say. Many Thanks Tom
All good Andy.
Take it steady👍👍
Hi Tom,
So just a quick one what controls our full throttle position so I feel as tho the bikes not getting enough fuel after around 7.5k and I’m relying on the powervalve but I can feel a struggle between 6-8k like on your video here when you pull the throttle back your bike takes off I can see a difference for sure because round town under 6k the bike is fine but when I want to open it up it’s like it’s struggling for fuel and I’ve noticed that mine won’t even go into the red limit where as I’ve seen some Ed’s rev to 12-13k but mine kinda won’t go past 11k? I have fitted a new air filter recently but a put a 128 main jet in to try and compensate for the bigger air intake? Just wondering if you have any thoughts
Cheers pal
Hello, it seems to me that you tighten the spark plug a lot and it is not necessary. If you keep doing it like this you may have problems with the thread. Try to tighten it as much as possible with your hand and then turn it a maximum of 1/4 turn with the wrench.
Hi Fidel. Thank you for your comment and I appreciate your concern.
I realise it may seem that way on camera👍
Rest assured I’m always careful with the plug and bolts around the engine.
Thanks again.
Full power rs drivers
Spillo Conico X25 1° tacca in alto (da acquistare se non presente)
Valvola Gas 50 (da acquistare)
Getto Emulsionatore minimo B65 (da acquistare)
Polverizatore BN266 (da acquistare)
Getto Avviamento 70
Getto Massimo tra 125 e 130 (da acquistare)
nice!
but wear a jacket!
brave man. I would certainly lose the needle retaining clip. I can't imagine trying to find a tiny piece like that on the ground. Too risky for me.
I agree. Very risky. Not doing it again. Especially so far from home!
Cheers
Tom
I used to work in north Sydney and lived in surrey hills next to central station. I totally miss driving on the wrong side of the road. @@tomdidit4216
hi tom i cant figure out my carb its running lean, its stuttering at around 6k rpm then it wont rev past 8k i think there is a problem with my powervalve and my air to fuel mixture i just installed new reeds hoping that it would fix my issues but didnt! do u think it could be a vacuum leak i dont want to ride my bike because im worried about a siezure im gonna try messing around with some different jets i am running a pipercross airfilter with the box with the snorkel still in stock exhaust and boyesen dual stage reeds im just praying that i havent screwed my engine up! any help would be greatly appreciated
Hi there.
This is strange… Has the bike been running ok and suddenly started playing up??
I’d get the power valve operational. If it is stuck in the closed position, it could alter the port timing and cause a restriction.
Then I’d be cleaning the carb and restore to standard jetting.
Other than that, it’s hard to diagnose a fault without having a look.
Fingers crossed you’ll sort it mate
Cheers
I would guess you have too big main jet, buy a set and check each. Normally in the unlocked version main jet should be 128
Hey man Can i put same plastics as you have on rs 125 1999 2t. If yes what year plastics you have put on?
no, they don't fit, same as the later 4 strike model plastics don't fit the 2nd gen 2 stroke ones
I think Zvonimir Tomić is correct, they will not fit.
If they did fit, I would probably go back to the 1999 shape😀. I really like the rounded model.
Thanks for your comment Armands.
Hi Zvonimir. Thanks for your comment mate.
Hello, can you show us how you mounted your mobile phone on the bike?
It looks like you gave glued a phone case on the bike
Hello and thank you for your comment.
You are almost right…. I drilled the back of my phone case and used cable ties on this occasion 😀. Works well, but super annoying to take on and off👍
For my feeling a little too mich engine break usage for a two stroke but otherwise a very good video mate :)
Cheers
at 7:32 you state that there is no stutter through the middle RPM. My aprilia the same model as yours, stutters at middle RPM. How do i fix this?
Hi there Biconnecc.
In my case, the stuttering around the middle RPM was caused by a rich condition. I was able to fix this by moving the C-clip on the needle up a notch. This procedure can help make the midrange mixture leaner.
Try this if you wish, with care. Monitor as you ride and adjust accordingly.
Cheers Tom
@@tomdidit4216 This is exactly what I thought I should do. That means you explained it well in your video! Thank you man. Will try today!
Good luck and take it steady.
Small adjustments and monitor is the key👍
@@tomdidit4216 hey man you aint gonna believe this. I opened it up and the circlip fell off as soon as i pulled the needle out. I carefuly adjusted it to the second setting and put everything back together. Now the bike runs like butter. Its acceleration no longer stops for a rest at middle RPM it just steadily shoots up like it should. Couldng be happier. Thank you so much for your thorough explanation. You caused me a better riding experience and so much knowledge!
Awesome news Biconnecc 😎! I’m happy for you mate.
Petrol aral ultimate 102 👍👍👍
Nice 👍
My RS 125 had an 62 Pilotjet but i could not get good Idle mixture so i increased it to 65 and it was much better but not perfect now i will try 68.
One Tip if your Bike is completely open you should maybe get an Sparkplug with an Thermal value of 10 not 9. 9 Might be ok but i saw already knocking on some bikes.
Hi David. Thanks for your comment.
Good luck with the tuning. It sound like you’re heading in the right direction. Jetting the carb is all part of the fun😀
I may try a 10 spark plug in the winter? Just to see how it goes.
Cheers
Tom
@@tomdidit4216 Yeah I am tuning 2strokes. For a decade but your vid is realy good in explaining it.
Good to hear mate👍
Ngk iridium br10eix is the spark plug you’re supposed to use in a full powered bike
@@thesweeneyboys2974 ITS not absolutely necessary to get a Iridium Sparkplug.
what does plug chop reading do/reads?
Hi Roronoa.
My very first video was about the plug chop process. Check it out if you haven’t seen it yet.
Basically, the spark plug will create a small carbon band around the porcelain insulator. This bad will tell you if your main jet is too rich or too lean.
It’s a very important step of tuning a 2 stroke.
Thanks for your comment.
Cheers
Tom
Hola
A ver, cada vez que se hace cualquier ajuste en la carburación hay que cambiar bujia
Y tu bujia es la br10eg
Yo uso br10eix, que es de iridio
Además, le tengo hecho el squish que quiero👍👍👍
Hi Jonathan.
No need to change the spark plug with each carb adjustment. I use the same spark plug when tuning the pilot and needle circuit. I only use a new plug on the main jet (plug chop).
I believe the BR10iex plug is a premium racing plug that will give you a good strong spark. Continue to use it if your bike runs well and it suits your adjusted squish band.
Happy riding mate, and thanks for your comment.
Tom.
Yo uso br10eg también
what is the phone support for rs125?
Hi Asier. Thank you for your comment!
Unfortunately there is no phone support on this channel as I am not a licensed mechanic or professional. I simply maintain what I own and share with you guys. Sorry if this appears misleading.
If you write your problem, I may be able to help if it’s something simple?
@@tomdidit4216 ok nothing happens I just found it curious the support for rs 125 I looked but did not find a suitable one👍🏻
what support to use for the phone?
Hi DiBari
It’s not an offical phone holder. I simply drilled the back of my phone case and cable tied it to the handle bars. The charging system is a separate battery pack.
(This was a temporary setup for filming only)
@@tomdidit4216 oh ok thanks
I have an equal with arrow today in the 99db inspection 🤦🏻♂️🙈😂
Good luck I guess 😀
@@tomdidit4216 today if I pass with original exhaust 🤦🏻♂️🤦🏻♂️😂🙆🏻♂️
Hi Asier. Did your bike pass?
@@tomdidit4216 yes friend👍🏻 ✊🏻✊🏻💨💨
Thanks mate UA-cam are grate
Please use irridium plug not cheap plug for big bike😂
FIRST :D
Cheers Phillip.😂
Good to be first 👍
THis bike remindsme of my SR50 scooter.... not much quicker either lol
Replace carburetor lectron bro
Hi Piw
You have got me thinking…..
A premix RS would be awesome. And it will swap out the crappy standard carb- which I think is the weak link on these bikes (fuel emissions)
@tom did it what size aprillia standard carburetor?
greeting from Indonesia bro
Greetings from Australia, Piw.
The later Aprilia bikes (like mine) came with a 28mm carb. The earlier rounded model of RS bike came with a larger 34mm carb.
According to Aprilia forums the 34mm carb is the way to go as it adds power throughout the rev range👍
It seems the older bikes were not as restricted as the newer bikes.
@tom in Indonesia rarely aprillia bruh sorry I don't know anything about aprillia motorcycles
Keine Ahnung!!
I really do love your videos but I cringe seeing you riding in a shirt I can tell it’s hot, stick a jacket tho. mate my arms bad scares from a 70cc ped when I was young
I hear you loud and clear Jamie👍
Thanks for the comment.
Hi there could u show a video on the fuel vacum setup cheers
yours is abit newer then mine i have a 22year old Aprilia RS125