09-08-2021, 08:03 PM
I have a similar issue, max rpm is 3700. I went thru everything as previously mentioned. Engines sound great even at the lower wot. My compression is low, even but low. 115-118 across the board. My engines tho are 32 years old with roughly 2100hrs. They’ll be coming out for an overhaul this winter. Hope you have a simple fix

