DrLivingston
New member
Ok so here is an update. Its been some journey. I want to share again how/when the problem started. After the boat running great for several outings I maybe overloaded the boat in weight with people and at 3/4 throttle it started losing power and i would have to keep 'bumping' it forward to keep speed. Then i settled on the current problem.
Here is where I am at.
I took apart the carbs again and dunked and soaked for 24 hours even after the recommended 20 mins. I got new gaskets etc and I rebuilt the mechanical fuel pump. I reassembled everything and had a helper on the water. After the soaking of the carbs again I idled great and smooth throttle up until 2500-3000 RPM again with that severe miss. So with my helper keeping it at throttle speed enough to 'miss' and previously removing engine cover I watched what was going on by the engine just as she was keeping throttle where I said to. Then I looked and realized at 'full throttle' only going 3k max and having this miss my butterflies on the carbs were barely cracked nevermind wide open. So I manually with my thrumb advanced the linkage from my top carb and sure enough she started taking off on plane as if nothing happened. It was running a ton better but only when my thumb advanced the linkage to match the throttle position otherwise it would bog down.
So my question is this. On a mechanical pump (on the 86' its the christmas tree looking version' what could of got out of sync? What do I have to link and sync to have the matched fuel pump,throttle and butterflies be in unison. I guess in theory that is what's out of whack but how that even happened is beyond me.
Here is where I am at.
I took apart the carbs again and dunked and soaked for 24 hours even after the recommended 20 mins. I got new gaskets etc and I rebuilt the mechanical fuel pump. I reassembled everything and had a helper on the water. After the soaking of the carbs again I idled great and smooth throttle up until 2500-3000 RPM again with that severe miss. So with my helper keeping it at throttle speed enough to 'miss' and previously removing engine cover I watched what was going on by the engine just as she was keeping throttle where I said to. Then I looked and realized at 'full throttle' only going 3k max and having this miss my butterflies on the carbs were barely cracked nevermind wide open. So I manually with my thrumb advanced the linkage from my top carb and sure enough she started taking off on plane as if nothing happened. It was running a ton better but only when my thumb advanced the linkage to match the throttle position otherwise it would bog down.
So my question is this. On a mechanical pump (on the 86' its the christmas tree looking version' what could of got out of sync? What do I have to link and sync to have the matched fuel pump,throttle and butterflies be in unison. I guess in theory that is what's out of whack but how that even happened is beyond me.