69starcraft
Petty Officer 2nd Class
- Joined
- Jul 11, 2007
- Messages
- 169
I've just done extensive work to this motor...
1. New CDI electronics powerpack upgrade kit (moves powerpack out from under flywheel)
2. New Coils (while I was figuring out powerpack issue...old coils were fine)
3. Have pulled carbs twice now, but think I might again...
The issue: Everything was running fine after all the work I did. We went out 3-4 times and all was fine.
Last time out we hit a wave (nothing major actually) at WOT and suddenly the engine dropped to 4000 RPM (from about 6000 RPM) and ran rough.
Throttled back and it runs fine at putt putt cruising speed. So we cruised back to the dock.
Came home, pulled the carbs cause it seemed like a fuel issue. Back to the lake for a load test (on the trailer) and still bogging and only 4000 rpm. Came home and pulled and checked carbs again, and pulled fuel pump to see if diaphragm was bad and its fine.
Checked Spark and it seems good, nice bright blue...
After a lot of checking things I ended up calling a "reputable" mechanic. He said I should check for holes in the block (???) and that maybe I broke a piece of piston off??? I explained I did a compression test and got (I'm guessing now, can't remember exact numbers) 125 or so on both cylinders.
He also said to start it and pull one plug at a time. I did so.
#1 cylinder (top) causes the engine to die if you pull the plug
#2 cylinder (bottom) the engine stays running
From another posting on Iboats I read that you should cover one carb at a time and see what that does.
#1 carb covered and the engine died
#2 carb covered and it spits gas all over my hand, but engine stays running (??)
Engine seems to run fine at idle.....
I need a little help interpreting my "test" results...
He also said maybe I sheared my flywheel key. However when I changed out the CDI I ordered and installed a NEW flywheel key, and although I didn't pull the flywheel this time. I stuck a screwdriver in cylinder one and turned by hand to verify that TDC is lined up o I don't think thats it.
I don't have the meter required to test DVA (for stator and etc...) but I'm hoping that's not it either...
1. New CDI electronics powerpack upgrade kit (moves powerpack out from under flywheel)
2. New Coils (while I was figuring out powerpack issue...old coils were fine)
3. Have pulled carbs twice now, but think I might again...
The issue: Everything was running fine after all the work I did. We went out 3-4 times and all was fine.
Last time out we hit a wave (nothing major actually) at WOT and suddenly the engine dropped to 4000 RPM (from about 6000 RPM) and ran rough.
Throttled back and it runs fine at putt putt cruising speed. So we cruised back to the dock.
Came home, pulled the carbs cause it seemed like a fuel issue. Back to the lake for a load test (on the trailer) and still bogging and only 4000 rpm. Came home and pulled and checked carbs again, and pulled fuel pump to see if diaphragm was bad and its fine.
Checked Spark and it seems good, nice bright blue...
After a lot of checking things I ended up calling a "reputable" mechanic. He said I should check for holes in the block (???) and that maybe I broke a piece of piston off??? I explained I did a compression test and got (I'm guessing now, can't remember exact numbers) 125 or so on both cylinders.
He also said to start it and pull one plug at a time. I did so.
#1 cylinder (top) causes the engine to die if you pull the plug
#2 cylinder (bottom) the engine stays running
From another posting on Iboats I read that you should cover one carb at a time and see what that does.
#1 carb covered and the engine died
#2 carb covered and it spits gas all over my hand, but engine stays running (??)
Engine seems to run fine at idle.....
I need a little help interpreting my "test" results...
He also said maybe I sheared my flywheel key. However when I changed out the CDI I ordered and installed a NEW flywheel key, and although I didn't pull the flywheel this time. I stuck a screwdriver in cylinder one and turned by hand to verify that TDC is lined up o I don't think thats it.
I don't have the meter required to test DVA (for stator and etc...) but I'm hoping that's not it either...
