20 hp mercury outboard

[Billy1955]

wont start with out squinting gas in carb,,after it starts one crank,,will run if you reave it up or keep putting gas in carb at idle,,but will not idle

 

[racerone]

Year / serial # must be posted.

 

[QBhoy]

Carb rebuild required, if you have already verified the fuel delivery is good...as in not blocked, contaminated or restricted

 

[Scott Danforth]

Welcome abord

in the past 70 years there have been about 15 generations of Mercury 20hp motors.

as racerone asked, year and serial number will help us help you.

what exactly are you working on.

as for the carb, Qbhoy is in the right direction with a carb cleaning / rebuild

 

[flyingscott]

Regardless of which one you have the first thing to do is a compression test.