I bought a cheep 2 stroke a while back, ( 93 kx 80) and fully rebuilt it top end and bottom new seals bearings also a completely new cylinder since the old was scored, all stock OEM specs no big bore kits or anything but I put it all together and no start check compression since it seemed low on the kick starter and it was I got 75 psi from roughly 5 kicks, so my question is with a new top end what else is making my compression so low? leaky seals on the bottom end? Help!