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agree dirt sticking in needle and seat causing flooding make sure when fueling bike use a funnel with srceen to keep the crap out.

From the beginning Now has it happened from new or was it running right when you got it and now have the problem. Answer this and I'll help you through it.;)

Hi I have a 10 week old 125cc Ji-pin engine and blows blue when de-accelerating and think it will be cracked piston ring ? Now the engine looks like a ducar engine but with the starter motor on top instead of under the engine. Does anybody Know of where I can buy parts for these chinese bikes...

Yes once its past the mid range poping and back firing it tends to run OK on full throttle.

Are any of those Jap engines water cooled if so will produce more power ,Known Fact!

:( Received new bike 250cc Zongshen. Doesn't run to well any ideas. It idles good but when third 1/3 throttle opened it pops and back fires but if at full throttle it disappears and goes good till you back off again.Bike is new and has done it since new ridden only twice. Rang supplier and...