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2008 GASGAS EC 250 sticking idle and rattle


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Hi guys, I have EC 250 2008 racing and I have kind of rattle when idling and sticking idle.

I set my mixture screw 1,5 turn out from fully closed and idle screw a lot in. Bike idles really fine no matter if cold or hot, but when I blip the throttle idle sticks higher and remains until I put gear and loose the clutch a bit or plug exhaust with my hand, than idle is back at normal speed. Can it be because air leak? I have sprayed chain lube on carb manifold and no change, so there is no leak, but maybe crankshaft seal??

Although I have rattle on idle that I think is normal for 2T but maybe not. I have very similar rattle on Husqvarna WR 125 which is after engine rebuild. Is it normal or not? Maybe rattle from reeds?


https://www.youtube.com/watch?v=AIytJVgRp44

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Google spanky's jetting guide for proper air screw adjustment and to test pilot circuit to make sure it is the right size 

got to set the air screw with the idle as low as you can get so it is not acting on the slide and bike has to be fully warmed up 

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