Hello Everyone,
I am completely new to this forum and new to boating. I picked up an old boat with a 1973 mercury 402 (serial- 3594641). It had good compression, but I had to put a new water pump, trigger, and carb rebuild. I got it running and it idles very smoothly. However, when I take it out to the lake and give it throttle it runs extremely rough then dies. It will then start up again and idle just fine. Any help on this issue would be greatly appreciated. My thoughts are the main jets? If the thought is the jets, is there a way to determine the size the main jet should be?
Thanks again in advance for any feedback.
I am completely new to this forum and new to boating. I picked up an old boat with a 1973 mercury 402 (serial- 3594641). It had good compression, but I had to put a new water pump, trigger, and carb rebuild. I got it running and it idles very smoothly. However, when I take it out to the lake and give it throttle it runs extremely rough then dies. It will then start up again and idle just fine. Any help on this issue would be greatly appreciated. My thoughts are the main jets? If the thought is the jets, is there a way to determine the size the main jet should be?
Thanks again in advance for any feedback.