Motorcycle Repair: no compression??, valve adjustment, thumpstar

Question
i have just bought a pitpro 125cc trail bike and it has no compression i have tried and tried to kickstart it and nothing will work it wont even rollstart. it is an 09 model pitpro 125cc thumpstar what should i do???

Answer
Carl, my experience is limited to Hondas but if the bike doesn't have compression it won't start under any circumstances.  You need to find out why it doesn't have compression.  It could be a bent valve, a hole in a piston or just improper valve adjustment. CHeck the valve adjustment first.  If you find one valve that has  alot of clearance that's the bent valve. Take the plug out and see if it's covered with oil.  If it is, most likely it's a piston or ring problem.

Regards,
Rich