[SEL] 40 hp Y

[bill boyce]

a 40 hp Y verticle fairbanks followed us home from an auction the other day, and after finding it low on compression, we discovered the
top ring is stuck. what is a good product to pour in the top that may disolve the gook/rust/whatever? the lower rings are free, and every 
thing else appears to be in order. i;ve seen this engine run in the past, but it set idle for about 3 years.,,,,    any ideas will be
appreciated.

bill boyce