Merc-45-classic
Recruit
- Joined
- Apr 10, 2022
- Messages
- 4
I have recently purchased a merc classic fifty 45 horse power. Bought it and was told it runs good. Started it up hooked to a hose with muffs and runs fine. Idles well and will throttle up in forward and reverse. When I put the boat in the water motor seems very lacking in power. Cannot get close to being on plane ( about 5-8mph) but will still idle fine and shift in and out of gear fine. Redid the timing with a timing light and had it set for 28 degrees at WOT (manual calls for 32 while in the water but subtracted four since I did the timing out of the water with no load). Nothing changed after resetting the timing. Have not pulled the carbs apart yet. Cleaned the fuel filter and still have the same problem. Going to take the carbs and fuel pumps apart next weekend ( they are combined on this motor…. One pump on each of the two carbs). Just looking to see if anyone has any ideas on what the issue could be. I also was able to rev the engine up in neutral while hooked to the muffs and ran great. When the boat was in the water, I did the same thing and the motor wanted to bog down and die out? Not sure if that has something to do with the back pressure from the exhaust when underwater or if that has something to do with part of the reason it won’t run like it’s supposed to
