I just took out my new boat, and had an issue with the motors which had previously run great. They are 1992 Johnson 140s, and both have had new powerheads within the past 3 years.
When I'd get above idle speed (seems like good cruising speed is 4000 rpms, sound right), one of the motors would start jumping around RPM's and wouldn't hold rpms at all. For example, it would jump up to 3500 and then back to 4500, etc. the other motor would doing it too for, but stopped after awhile. When I first statred going I was playing with the trim, so thought that was the cuase, but later realized it was happening when I left it alone.
Any ideas? Thanks.
When I'd get above idle speed (seems like good cruising speed is 4000 rpms, sound right), one of the motors would start jumping around RPM's and wouldn't hold rpms at all. For example, it would jump up to 3500 and then back to 4500, etc. the other motor would doing it too for, but stopped after awhile. When I first statred going I was playing with the trim, so thought that was the cuase, but later realized it was happening when I left it alone.
Any ideas? Thanks.
