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#1
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merc 90 hp 4 stroke carb question
90 hp 4 stroke on a pontoon. It has a stumble at low rpms and I was thinking of pulling the carbs off and cleaning them. But cant find a carb rebuild kit. Buying all the o rings and parts from merc is expensive. I really don't want to clean everything and reuse float and intake o rings. Any ideas? Or just deal with it? Its not my boat, just take care of it and a small cabin on the river for some friends.
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#2
04-29-2018, 09:01 AM
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One of the smart guys will be along, but i d run some sea foam through it. I never had much luck with ***8220;mechanic in a can***8221; products, but sea foam has helped on some issues like this. I m guesssing your using non ethanol and have put in fresh fuel filters.
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#3
04-29-2018, 10:41 AM
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I reuse those o-rings all the time. If you need parts, its probably easier to get them for a Yamaha 90(same power head) Clean the needles and seats. IF you don't have a vacuum gauge set up, don't try to do it without one. They are very finicky. Dont use harsh chemicals to clean them( I use an ultrasonic cleaner). I you carry it to a shop, be prepared for sticker shock. BTW, those carbs are $700 each new.
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#5
04-29-2018, 06:10 PM
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if you know how to use one, then it shouldn't be a problem. Bottom carb is the master carb, set the idle mixture screws back in the same place
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#6
04-29-2018, 08:51 PM
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looks like it has a plug over the fuel (idle) mixture screw. Drill and put a screw in and pull out is what I did on bikes. Supposed to be warm this week I might get time to pull carbs off. In 2 weeks the boat will be in the water for the summer and I don't want to do it sitting at the dock.
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