Spare parts thread 2 strokes Yamaha RX family

[SriramEfunds]

@ all, can anyone show me some love with a 17.5 Pilots pls??

Why do you need that? I thought you have 5 speed carb on yours.

[dual disc 200]

^^ Yes, i do have a 5S carb Sriram, as i couldn't source the 135 mains and could only get the 165 main's, the bike feels kind of rusted at 60 and refuses to go above that after putting in those 165's, hopefully thinking that the pilot might be lean as it has 15 in it. So planning to plonk in the 17.5's and see. Hopefully that should settle these once in for all for a stock bike and that's what Arun also told when discussing about it today...!

[aargee]

^^^ At 60 your main jets work not pilot

[SriramEfunds]

^^ Yes, i do have a 5S carb Sriram, as i couldn't source the 135 mains and could only get the 165 main's, the bike feels kind of rusted at 60 and refuses to go above that after putting in those 165's, hopefully thinking that the pilot might be lean as it has 15 in it. So planning to plonk in the 17.5's and see. Hopefully that should settle these once in for all for a stock bike and that's what Arun also told when discussing about it today...!

You are amalgamating the 4 and 5 speed carbs here. Either you plonk 4 speed carb with said jets or try to source 5 speed jets. Reason is, they both are not the same mm carb. If you face an issue, might not be able to trouble shoot as you have mixed up parts inside.

[dual disc 200]

^^^ At 60 your main jets work not pilot

Ok, it was an experiment to settle the issue Aargee. If that should be the case, what might be the problem though?? Forget about the clearances, it's all good there.

[dual disc 200]

You are amalgamating the 4 and 5 speed carbs here. Either you plonk 4 speed carb with said jets or try to source 5 speed jets. Reason is, they both are not the same mm carb. If you face an issue, might not be able to trouble shoot as you have mixed up parts inside.

Very True Sriram...! It's like me eating dessert before the main course, the way it's mixed up. But, the same set-up is running on Arun's bike and the bike is as good as possible without any glitches...! Arun is running on 4TL420 with 165 Mains & 17.5 Pilots...! Btw. both the 135 4s & 5s are on the same VM22 Carb's Sriram, just that the 5S has Oval Venturi whereas the 4S has a round.

[aargee]

Ok, it was an experiment to settle the issue Aargee. If that should be the case, what might be the problem though?? Forget about the clearances, it's all good there.

What is the issue? Going through prev page, I only found you installed a new jet & have parked the bike due to rains.

[dual disc 200]

What is the issue? Going through prev page, I only found you installed a new jet & have parked the bike due to rains.

Here it is Aargee,

• My Bike is a stock 5 Speed with 4TL20 carb which is the stock 5S carb. I was in the mindset that the bike was running on the stock Jet sizes, but i was completely wrong when i found out that the Mains was of Rx 100, "115".
• Finally found some sources who got me the 165 Mains jet of the 4S but failed to get the Pilots of 17.5 which is the stock for 4S.
• The bike initially when it had the 115 Jet, used to be fast from standstill to 50 but will be way too strained if i push it a little further. SO decided to plonk in the 165 mains which i did off late 2 days back.
• Took the bike out for a spin today morning after waring up the engine, the bike felt a bit sluggish at lower speeds, was happy that it will be quite peppy once i cross 60, but all my dreams were busted seeing the bike feel really strained at 60's.
• Didn't push the bike further as i didn't want to run it lean (My guessing of Pilots) as the 165 mains should be matched with 17.5 pilots and not what i'm using now "15"

Being the above said points and what u've said that the Main jet is only responsible for speeds above 60's what might be the issue? Arun also had asked me to have a check on the Reed's which according me should be fine, but will also have a check on that.

To sum up, the bike has a 5 Speed carb with 165 Mains & 15 Pilots, with the slider needle in the middle clip.

Any suggestions??

[aargee]

^^^ Will keep these in mind; color of spark plug pls?
Strained at 60 means...are you unable to cross 60 OR able to cross but with struggles?
Meanwhile...
- Are you having starting trouble?
- Are there fluttering? If yes...is it during idling or upto 60 or above 60 (incase)
- Are you able to idle without trouble?
- Check the condition of the float + the gasket on the diaphram

[dual disc 200]

^^^ Will keep these in mind; color of spark plug pls?

Dark Brown in Color, although Golden Brown is the way to go, there is little excess oil pumping in cos of Autolube which will be rectified soon.

Strained at 60 means...are you unable to cross 60 OR able to cross but with struggles?

Not just struggles, but seems like a one hell of a struggle, but i can cross for sure just that i don't want to forcefully push her to know the unknown.

- Are you having starting trouble?

Absolutely not, earlier with 115 Mains i need to use choke during the first start, but now with 165's no need of Choke & she fires up in just one half kick.

- Are there fluttering? If yes...is it during idling or upto 60 or above 60 (incase)

Absolutely no fluttering, just that the bike gets shaky when I hit 60. Rpms hitting back & forth...

- Are you able to idle without trouble?

Absolutely...No trouble in Idling with & without Headlights ON.

- Check the condition of the float + the gasket on the diaphram

Very Clean & seems just about fine

[sixspeedtwin]

Ok, it was an experiment to settle the issue Aargee. If that should be the case, what might be the problem though?? Forget about the clearances, it's all good there.

What Jets u need? Gimme some time ...

[dual disc 200]

What Jets u need? Gimme some time ...

I would require 17.5 Pilots Alok, if you could also get me a 135 Mains nothing like it..!

[aargee]

^^^ From your readings I don't see any issue with the bike; if you're skeptical, just change the jets & keep riding.

[dpak89]

@ram:my wild guess(partly sure too) carb is not the issue with your bike!! i have ridden it before it was rebored...it did nicely above 60 with the standard size piston on it!!and my suggestion would be try comparing the 60 plus speeds of your bike with a same stock 5speed with catcon...like try driving some other bone stock bike..then you would know how big the difference is!!or even in worst case there wont be one

[dafc]

Here it is Aargee,

• My Bike is a stock 5 Speed with 4TL20 carb which is the stock 5S carb. I was in the mindset that the bike was running on the stock Jet sizes, but i was completely wrong when i found out that the Mains was of Rx 100, "115".
• Finally found some sources who got me the 165 Mains jet of the 4S but failed to get the Pilots of 17.5 which is the stock for 4S.
• The bike initially when it had the 115 Jet, used to be fast from standstill to 50 but will be way too strained if i push it a little further. SO decided to plonk in the 165 mains which i did off late 2 days back.
• Took the bike out for a spin today morning after waring up the engine, the bike felt a bit sluggish at lower speeds, was happy that it will be quite peppy once i cross 60, but all my dreams were busted seeing the bike feel really strained at 60's.
• Didn't push the bike further as i didn't want to run it lean (My guessing of Pilots) as the 165 mains should be matched with 17.5 pilots and not what i'm using now "15"

Being the above said points and what u've said that the Main jet is only responsible for speeds above 60's what might be the issue? Arun also had asked me to have a check on the Reed's which according me should be fine, but will also have a check on that.

To sum up, the bike has a 5 Speed carb with 165 Mains & 15 Pilots, with the slider needle in the middle clip.

Any suggestions??

my take the pilot jet doesn't play a much bigger role after you're almost 3/4th on the throttle but the jet needle and the position of the clip is a HUGE factor and so is the mains.

edit: heck the mains starts kicking in once you go almost near 1/2 the throttle, a little by little after that the mains becomes the deciding factor on what your jetting is like