Re: mark 75 issues

[motoscott909]

Hey all,

I took the powerhead apart because it had been sitting since about 1970 and some of the rings were stuck. The rest of the internals looked very nice. I split the rod caps to inspect the journals and they looked brand new along with the rollers. I replaced the upper and lower seals along with the upper and lower main bearings only because i was in there and didn’t want to have to do it again.

Frank- I think that your idea about water ingestion is very good, because honestly im not sure what else it could be? Cylinder #3 spark plug always looks "wetter" than all of the others, which really makes no sense to me, because cylinders 3&4 share one carb. Cylinder #4 is always golden brown along with the others.

I guess my next question is, How do i determine if it is indeed ingesting water, and where could it possibly be coming from? When i had the powerhead apart ,i replaced all the gaskets including the top cover and the large exhaust plate cover. The inner exhaust plate did seem sort of "warped" but i figured it would flatten out when i tightened the exhaust cover bolts.

Thanks again for any input!

Scott