Update… My motor didn’t actually fail the leak down test, I re tested with the motor locked at TDC and both cylinders passed. I think I’ve tracked the problem down to a bad crank seal at the top. The top spark plug stays perfectly clean, and the bottom plug gets soot on it. I installed a tiny tac and ran the motor for 3.5 hrs today. The max RPM I get is 3,400RPM.
The reason I think it’s a bad crank seal is because if I spray the top of the block (under the armature plate) with brake clean, the motor will stall. This also would explain the clean top plug (running lean).
Motor running and being sprayed (you can hear the RPM’s drop, didn’t spray it long enough to kill it)
https://www.dropbox.com/s/y44llm7isc6g4 … 2.mov?dl=0
Is this tool the only way to change the seal without taking the case apart?
