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1985 Yamaha 200 on 20' Mako. Starts and runs fine under load. WOT 5100rpm.
When on trailer and running on flush muffs with moderate throttle applied, engine rpm pulses between 3-4k and has a few misfires. Below 2900 rpm runs fine and holds steady. Plugs are fresh, but carbs have not been cleaned or adjusted in 6 years.
As it runs well, I am inclined to do nothing for now. Any thoughts?
When on trailer and running on flush muffs with moderate throttle applied, engine rpm pulses between 3-4k and has a few misfires. Below 2900 rpm runs fine and holds steady. Plugs are fresh, but carbs have not been cleaned or adjusted in 6 years.
As it runs well, I am inclined to do nothing for now. Any thoughts?
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