1974 merc 20 hp cuts out at high speed

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Posted by bill ( on August 18, 2005 at 18:35:35:

Took carb apart found gummy stuff and cleaned, put back together and had a heck of time getting started again. Finally got it started and adjusted low idle screw and runs good at low and fast idle, reverse gear low and high runs good. When I go in foward gear low throtte runs fine but when I increase the throttle it cuts out and then surges. It did this before I took the carb apart too.

Is there a high speed idle too? Or am I off base. Thanks for any help.

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