riverventures
New member
Hi everyone,
I have a 1996 Yamaha 50HP 4 stroke that is giving me fits. She starts up fine and runs fine at different RPM's. Might idle rough like it is missing on one cylinder but smooth out with a small tweak of the throttle. Seems to smooth out under higher RPM's and at WOT runs like a top. Idle or go slow and the motor runs rough, it might quit and then start hard after being run. After an extended period at idle you can see quite a bit of droplets of gas hitting the water, spitting out the exhaust. Can smell gas from the time the motor cranks up, its pretty strong right out of the gate. I didn't notice and gas under the cowling, just spitting from the exhaust.
Looks like the top cylinder is the culprit, which is also the one that has the oddball carb. The carbs have been rebuilt with no difference. Compression is good on all 4, the only thing not done at this point is to have a new carb installed on the top cylinder.
Any ideas where I should look? I hate to drop $400 on a new carb if its just a shot in the dark.
Thanks for your suggestions.
I have a 1996 Yamaha 50HP 4 stroke that is giving me fits. She starts up fine and runs fine at different RPM's. Might idle rough like it is missing on one cylinder but smooth out with a small tweak of the throttle. Seems to smooth out under higher RPM's and at WOT runs like a top. Idle or go slow and the motor runs rough, it might quit and then start hard after being run. After an extended period at idle you can see quite a bit of droplets of gas hitting the water, spitting out the exhaust. Can smell gas from the time the motor cranks up, its pretty strong right out of the gate. I didn't notice and gas under the cowling, just spitting from the exhaust.
Looks like the top cylinder is the culprit, which is also the one that has the oddball carb. The carbs have been rebuilt with no difference. Compression is good on all 4, the only thing not done at this point is to have a new carb installed on the top cylinder.
Any ideas where I should look? I hate to drop $400 on a new carb if its just a shot in the dark.
Thanks for your suggestions.