I have a '85 TRX125 that I recently rebuilt. it sparks, has some compression (Can't be specific, tester broke the other day) and I'm manually inputting gas. It won't fire, any ideas? when I bought it, it was apart and rusty internally. the cylinder has some light pitting at the topmost portion of the cylinder. I cleaned as much rust out, and have added oil medic to clean whats left. everything else appears to check out. The motor has new rings and gaskets, and the cylinder head valves look ok. Again, anything to help get it running!