Rpm drops on idle

[swehollow]

So. I have this gasgas 250 from 2003. I just renovated the engine With new connecting Rod, all gaskets, piston, piston ring, main bearing etc. The bike was not idling before the overhaul and I still have a problem.

I have a ne1c needle set to first position, a 40 pilot and a 168 main. Nr 6 slide. Ive set the slide height to 1 mm, set my float level, put AS to 1,5. Idle screw out.

Here is what happens. It fires up, and as Long as i keep reving slighty its ok, when i release it Will idle fine for a few seconds, after That time the rpm suddenly drops. Way low, to a Point where its barely staying Alive. And most Times it dies.

What is this? Happens evvvery time.

I cant figure it out.

[gassergrant]

Maybe worth trying the needle in pos 2 or 3 ??

[Todd5774]

You have played with the idle screw?

[swehollow]

Originally Posted by gassergrant

Maybe worth trying the needle in pos 2 or 3 ??

Had the needle on third to begin with. Same story

[swehollow]

Originally Posted by Todd5774

You have played with the idle screw?

Yeah ive toyed with it a little but no real results. Doesnt the idle screw just push your slide up/down? How high can u set the slide, and what happens if you go too high ? I would have somewhat better result idling with the slide higher. But it ends up dying from too much gas it seems, so not really an option

[Todd5774]

Do you have another needle to play with, as my 300 won't idle unless it has the JD red needle in, and then will idle all day but when it was a 250 it didn't like the red needle and would die after 30 seconds or so..

[swehollow]

Actually i dont.. Would you recommend me one ? I would appreciate an ebay link or something similar.

Originally Posted by Todd5774

Do you have another needle to play with, as my 300 won't idle unless it has the JD red needle in, and then will idle all day but when it was a 250 it didn't like the red needle and would die after 30 seconds or so..

[Todd5774]

Sorry no, our resident forum jetting juru (jakobi) will be along to recommend the right needle.

[Jakobi]

I know nothing about the early models. I've posted loads of info on how to fine tune your bike based on how it behaves though.

Check the jetting database for ideas of good starting points.

[swehollow]

I Will defenitly read through it. Just sometimes the language acts as a barrier for Deep understanding.