Jonway yy250t By gnoik (Read 887 times)

[gnoik]

Hello everybody.
I have been reading your problem, to find out whats wrong with mine. It was stalking and when i held my hand on air intake it was running much better. The solution was too small main jet.
So if anybody will have this problem, check your main jet.

Thanks for all the information i get here, i will try to help you guys as i can

Regards Peter

[widehide]

Welcome, gnoik, thanks for the info. What size main jet did you go to?

[scootaway]

Did you hold your hand over the intake whilst riding or whilst idling? If at idle then it is not the main jet, if it was whilst riding then perhaps but I have never heard of a main jet been tested by blocking the inlet. Just a thought

[Alleyoop]

Scootaway, is correct, if it idled better with your hand over the air intake that means your running LEAN at Idle you either have to richen up the Air/Fuel Mixture or go up 1 size on your Pilot Jet NOT your Main Jet. Your Main Jet does not come into play until your at least half to 3/4 and WOT.
Alleyoop

[gnoik]

Idle was ok, but didnt rev

[widehide]

gnoik, it sounds like you could have had a vacuum leak. it would idle ok but not rev up, good vacuum is required to pull the carburetor slid up and rev up the engine.