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RS 125 adjusting carb, engine cuts off when pulling away

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Runeazn
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Joined: 27 Dec 2014
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PostPosted: 15:58 - 16 Apr 2015    Post subject: RS 125 adjusting carb, engine cuts off when pulling away Reply with quote
So I finally was able to adjust the idle speed, now it's running at 1.2k.
However when it was running cold, I was driving it for a while then I went back home to adjust the motor while warm. It was driving well.
Now it is idling really well, unlike before it would just die out.

Now whenever i'm blipping the throttle it will just bogg instead, let say, i throttle slowly to 2k blip it then it will stay at 2.5k .

So when im in gear, no prob till 2-3k but once at 4 it will just kind of die off till i lower my throttle?

It has a new 122 main, there was 128 main in there before when I bought the bike and took it for a drive. However I did a top end rebuild and decided to put the right main in there.

So I thought because of the strange phenomenon it sounded like the engine got flooded or something? So I put needle clip from richest(lowest) to highest(leanest) setting but nontheless it doesn't work.

Anyone an idea what this is? I mean it shouldn't be this bad I can't drive with a 122 main.

Its a PHBH28 2006 rs PY
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spriddler
Two Stroke Sniffer



Joined: 15 Jul 2014
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PostPosted: 18:46 - 17 Apr 2015    Post subject: Reply with quote
Runeazn wrote:

So when im in gear, no prob till 2-3k but once at 4 it will just kind of die off till i lower my throttle.


The main jet only comes into play from about 3/4 to full throttle.
So, it sounds like the 122 main jet mixture is too weak which will cause overheating, poss seizure and/or a holed piston.
So, have you removed the air filter? If so it will need a larger main jet than with the filter fitted.
So, whether a 128 is correct or not, refit it.
So, then you'll have to experiment to find the best needle position.
Quite so.
____________________
1954 Matchless 350. 1947 AJS 500. 2012 Kawasaki ER6, 2014 Honda CBF 125 (aka The Grudge Special') 1926 ATCO motor mower, Motorhome, People carrier....and vintage bicycle.
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Vincent This post is not being displayed because the poster is banned. Unhide this post / all posts.

Runeazn
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Joined: 27 Dec 2014
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PostPosted: 22:12 - 18 Apr 2015    Post subject: Reply with quote
Vincent wrote:
Do you have the standard air filter and exhaust? If so, I'd deffo stick with stock jets and needle clip setting for now.

Throttle slide fitted correctly? (some can be fitted backwards with similar results).

Has a sports exhaust.
122 is stock for the unrestricted RS. 128 is the mainjet for a restricted bike. Old owner derestricted the bike while leaving the old jet in there.

It shouldn't be overheating, temperature seemed alright.
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Runeazn
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Joined: 27 Dec 2014
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PostPosted: 18:42 - 19 Apr 2015    Post subject: Reply with quote
Seems 128 main is better.
I also noticed i'm leaking black watery stuff, i think this is coolant. Not sure how I'm going to solve this as it has a fresh gasket...
Also it the motor doesn't idle when it's cold, only when it's warmed up it is able to idle?
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Old Thread Alert!

The last post was made 10 years, 296 days ago. Instead of replying here, would creating a new thread be more useful?
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