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would not be any older then 5 years, Thats a great guide i will have a crack, I dont have the caps on top of my engine, would they be under the rocker cover Maybe its a push rod engine and not OHC, Does anyone know how to tell the diffirence????? I did read that the zongshen 250cc...

Hi guys and gals I have a thumpstar with a 250cc zongshen engine, bike starts ok but wont run without choke on, I took the carby to a motorcycle repair center and they cleaned the jets for me but still wont run unless choke on, It some times runs without choke but soon as you rev it it...

Hi guys, what is the valve clearances on a 2500cc zongshen motor for the OHC engine and posh rod engine Also what tension do u do the head back up to on both these engines??? Also how much oil do u use??? ive been told 800mls and 1200mls wich one is it?????

Hi guys I have a 250cc zongshen engine, I tried to find the bolts on top of the engine for where the valve clearances are, could not find them, there was only one small bolt that goes horizontal to the engine, do these engines have covers on top and there under that Or is it a push...

Hi Guys Thumpstar 250cc starts easy with choke on but the bike will only run with choke on, it will idle with choke of 85% of the time but soon as you give it revs it dies, I have taken carbie to a shop and got it cleaned properly, new fuel lines, but still wont run with choke off...

Thanks for the replies guys Would like to keep this a cheap project as it is a present, im going to tackle changing the rings my self, is this a hard job, never done it before tho I am pretty handy careful and patient, I would also like to adjust the cam chain and re-adjust the rocker to...

Hi guys I bought a thumpstar dirt bike with a 250cc atomic engine (ZONGSHEN) pretty cheap For my wife’s brother as a present, just sorting it out before I give it to him the compression on the bike seems started within a few kicks with a new spark plug and fuel, starts 1st kick every...