could someone tell me the minimum compression on this quad ? it is a 2001 two stroke it started running rough after this weekend ride it wont idle changed plug, new air filter and cleaned carburator still wont crank without holding throttle at half position and will not idle.

 

Minimum of 90 psi,but can loose compression when warmed up. If you can place your finger over the plug hole and wont blow thumb away from hole when turning over,just tear down(very easy) and check top end,may just need a fresh piston. OPT

 

When I get one of these I check comp and if less than 100psi I get on Ebay and get a topend kit that has piston,cylinder and gaskets for less than $200 and it is set to go.