OK, my newly rebuilt 55hp has a running problem that really has me frustrated. It runs great at full throttle, idle and throttles just above idle. But when accelerating onto plane there is a 5mph range where the engine runs poorly - its sputters/misses in this range (it is a very small range of throttle), but if you just nudge the throttle a bit higher, it smoothes out nicely.
To me it seems like the issue is in the low speed circuit, as certainly when the engine is running on the main jets, it runs perfectly. I have taken apart the carbs (twice) and sprayed them out, with little benefit. Could the timing be off? Can this be checked safely out on the water?
The shop who rebuilt it is so untimely that if I drop it off there, it will sit for weeks, so I have tried to tackle this myself. They think it is in the ignition system (amplifier, but it is new), but I dont see how this can be, given that it runs good over most of the range.
Any suggestions would be GREATLY appreciated.
To me it seems like the issue is in the low speed circuit, as certainly when the engine is running on the main jets, it runs perfectly. I have taken apart the carbs (twice) and sprayed them out, with little benefit. Could the timing be off? Can this be checked safely out on the water?
The shop who rebuilt it is so untimely that if I drop it off there, it will sit for weeks, so I have tried to tackle this myself. They think it is in the ignition system (amplifier, but it is new), but I dont see how this can be, given that it runs good over most of the range.
Any suggestions would be GREATLY appreciated.
