'94 503LTR, burned up a piston hauling firewood on old gas last year. OH'd the bad cylinder/piston with new and reassembled. Ran strong right on start up.
This season, the newly OH'd cylinder has compression, fuel and spark but doesn't fire. Once the rpm gets high enough (3/4 throttle +) the cylinder comes to life. Thought it might be a spark issue (higher rpm, hotter spark) But am not sure a stator works like that.
It has the three basic components and no go. Anyone want to take a stab at this? I have built a number of auto/aircraft engines but this is the first two-stroke I've ever done. The spark is not a bright blue but I've seen much worse fire. The compression was not checked with a gauge but seems equal to the other cylinder. I completely disasembled the carb and cleaned every orifice and passage. Bowl looked clean and floats were OK.
While the engine is running, I can pull the carb slide completely out with no effect. I can see the fuel running through the carb and the plug is wet.
BTW, this is a cabin machine and hasn't been out of the bush in almost 10 years.