I am 99% sure I know what was wrong, but as soon as I open my big mouth . . . I'll probably jinx the motor. Basically I believe that it wasn't getting enough fuel at high rpm.
The hose from the merc male plug to the fuel pump is 1/4" ID and it was kinked a bit by a tie wrap. I put that tie wrap on to keep the hose away from the linkage (when it was near full advance). Anyways . . . to make a long story short . . . I had MJ working the throttle while I was watching the linkage near the hose. 1 out of every 5 times the throttle was advanced to near WOT the linkage bumped the hose and kinked it (cutting off the fuel). I rerouted the fuel lines and fittings to the carbs with a old school three way fuel pump nipple. I pulled apart the fuel pump just to look for any shaving on the filter screen and replaced one of the check valves that wasn't very snappy. The motor seems to have like the changes, so I'm happy that MJ's happy and the boat is running well.
I'm pretty sure that's this will one of the final chapters in the MJ motor fiasco series. Well change the poppet valve and rebuild the carbs in the spring . . . just to be safe :)
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11-12-2008, 08:08 PM
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