OK, well I am confused about what you have reported, doesn’t seem like the cylinder with low compression would be the one that is firing OK… But, anything IS possible.
Let’s start with the compression though. First, recheck it, perhaps your gage is messed up. Are you cranking the engine with the electric starter when checking compression, or with the recoil? Using the recoil will activate the compression relief system, which may explain your strange compression readings. Trying checking compression with the electric starter.
