[wilkin250r]

I also suspect spark.

My test is starting fluid. Spray some into the carb and try to fire it up.

-If it starts for a couple seconds and dies, then it means the engine is ready to run, but you have a fuel delivery problem. Check carb, fuel pump, ect.

-If it doesn't start, it means something in the engine is goofy. On engines where it last ran fine, no catastrophic bang, bent rods, cracked blocks, or other major problems, it usually boils down to a spark issue.