new carbs

O

olibass1

Cadet
Joined
Jun 16, 2003
Messages
12
hello,<br />i just put 2 brand new carbs (straight from mercury factory) on my 1988 60hp mariner and i need a few tips on tweeking it. i had it out on the water and did some adjustments with the idle mixture screws and got it running pretty good but not quite right. it seems if i adjust to get it to start right up, it will hesitate a little on acceleration. if i adjust to get rid of the hesitation, it will not start as good. should i be adjusting the carbs one at a time or should they be adjusted simotaneously? lower carb has a .072 jet and upper has a .074 jet. any help?<br /><br />thanks
 
J

jim dozier

Lieutenant Commander
Joined
Jan 8, 2003
Messages
1,970
Re: new carbs

Open the idle mixture screws 1.5 turns from lightly seated unless the manual says otherwise. Warm up the engine. Set the engine idle speed to spec, should be around 700 rpm in the water (not muffs) in gear. Work on 1 carb at a time. Adjust the idle mixture screw for best idle then open 1/8 turn more. Reset idle speed to 700 rpm. Do the next carb the same. Reset idle speed to 700 rpm. You should only need to choke a cold engine. Since you replaced the carbs you probably need to do a link and sync to synchronize you ignition timing to throttle position. This is different for every engine and you need a manual, you do have the manual don't you?
 
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