trx250 fourtrax low compresson

[Mark S]

i have a trx250 with low compression, does anybody have any suggestions on how to do the top end? do i measure the bore and choose a piston and ring to suit ?

[Grizzlebee]

you'll need to get the top end rebored or get a new cylinder then match the piston to that.

[spock58]

Don't forget to examine the valves closely, this may be where the loss of compression comes from.