Need some help with carb adjustment, 90 Merc 2-stroke

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cwag911 · #1 Post by **cwag911** » Thu May 30, 2013 11:32 am

This is a friends boat with a 2000 Merc 90 hp. The carbs have been rebuilt, all fuel lines replaced and the fuel tank cleaned. He hasn't taken it out for a ride yet, but idling in his slip, about every 10 seconds or so it spits then idles fine then spits again. A marine mechanic friend thinks it's running lean. I was going to have my friend take it for a ride, then check the plugs. Any info on carb adjustment would be helpful. TIA.

MPosey519 · #2 Post by **MPosey519** » Thu May 30, 2013 12:05 pm

If it's just during idle, the idle adjustment screw should be on the side of the carbs. start with them 1 1/4 turns open and adjust from there.

curtiscapk · #3 Post by **curtiscapk** » Thu May 30, 2013 12:08 pm

Carl,

normally one and a half out....

cwag911 · #4 Post by **cwag911** » Thu May 30, 2013 12:14 pm

OK, is out leaner or richer?

MPosey519 · #5 Post by **MPosey519** » Thu May 30, 2013 12:16 pm

richer, allowing more fuel in

cwag911 · #6 Post by **cwag911** » Thu May 30, 2013 12:47 pm

Thank you

cwag911 · #7 Post by **cwag911** » Sun Jun 02, 2013 6:19 am

Just an update. Richened up the carbs (1/4 turn) and it runs fine. Thanks again guys.

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Need some help with carb adjustment, 90 Merc 2-stroke

Need some help with carb adjustment, 90 Merc 2-stroke

Re: Need some help with carb adjustment, 90 Merc 2-stroke

Re: Need some help with carb adjustment, 90 Merc 2-stroke

Re: Need some help with carb adjustment, 90 Merc 2-stroke

Re: Need some help with carb adjustment, 90 Merc 2-stroke

Re: Need some help with carb adjustment, 90 Merc 2-stroke

Re: Need some help with carb adjustment, 90 Merc 2-stroke