" My mechanic informed me this
" My mechanic informed me this spring that the bottom two cylinders on my 1991 Johnson 88SPL had low compression. He said I could keep running it with no problem but to not run at WOT (which I never do anyway).
Recently it started running really rough. I pulled the plugs and two looked pretty normal, if a bit worn; one had stuff (carbon?) in the gap and on another one, the ground electrode was bent down towards the center electrode. I see no evidence of anything actually hitting the electrode, but it sure was bent out of whack - my mechanic says this may be from water seeping into the combustion chamber and hitting the hot plug tip, causing it to bend. I tried to look into the cylinder, and see no evidence of anything being in there that shouldn't be. Is my mechanic right?
I replaced all the plugs but haven't tried to run the motor yet - I was told they are factory gapped, but I've always gapped them myself in the past - do I need to check the gap, or are they good to go?
Is there anything else I should be doing?
Is this motor worth trying to rebuild? It has gobs of hours on it (at lest 1000), I'm certain. "
" My mechanic informed me this spring that the bottom two cylinders on my 1991 Johnson 88SPL had low compression. He said I could keep running it with no problem but to not run at WOT (which I never do anyway).
Recently it started running really rough. I pulled the plugs and two looked pretty normal, if a bit worn; one had stuff (carbon?) in the gap and on another one, the ground electrode was bent down towards the center electrode. I see no evidence of anything actually hitting the electrode, but it sure was bent out of whack - my mechanic says this may be from water seeping into the combustion chamber and hitting the hot plug tip, causing it to bend. I tried to look into the cylinder, and see no evidence of anything being in there that shouldn't be. Is my mechanic right?
I replaced all the plugs but haven't tried to run the motor yet - I was told they are factory gapped, but I've always gapped them myself in the past - do I need to check the gap, or are they good to go?
Is there anything else I should be doing?
Is this motor worth trying to rebuild? It has gobs of hours on it (at lest 1000), I'm certain. "