I just picked up a 98 blaster for 350. Has a newer top end but compression Is low I have not did a compression check but the kick starter goes down pretty easy by hand.. so I pulled the head off and everything looks to be in good shape . The guy says he didn't use a torque wrench on the head or cylinder . I plan on pulling the cylinder off later. And checking the rings. What would cause low compression besides bad rings or leaky head gasket?