I would pull the heads and have a look inside, mid 80's omc and upwards motors didn't have a lot of compression to begine with. Main concern is what is causing the 0- low compression, could be something as simple as a head gasket. I would worry about the low compression right now before getting to the spark. Compression test should be done without spark anyway.
If you pull the heads and see scoring on the cylinder walls and/or pocketing on the head(s) a rebuild is in order. Some at this point would trash the motor depends on your mechanical capability a rering and hone isn't beyond most backyard mechanics.
Brian
|