This one is a stumper to my boating pals and maybe someone can help. I have an 89 17' Bluewater with a new 4.3 with Thunderbolt ingnition. Rebuilt altenator and rebuilt 2GC Carb. Timed out at 8 BTDC when I had it running in the yard and will rev up but not a snap rev up. Take it out to the...
