merc 90 hp 4 stroke carb question

[oteps]

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.

[phatdaddy]

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.

[spareparts]

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.

[oteps]

I have a vacuum carb sync tool. I used to work on motorcycles, I would think its the same thing. I have a bunch of different adapters to screw into intake.

[spareparts]

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

[oteps]

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.

[THEFERMANATOR]

Pay CLOSE attention when you do them to get ALL the fuel circuits cleaned out when you do them. Some of those carbs have 4 fuel circuits(my Honda had 4, talk about a PITA). Sometimes there will be 2 or even 3 fuel pickups for the jets too, so make sure you get them all.

[steplift20]

Hey ferm let me know if there is a house for sale next to you, I'm going to move there with my 1988 merc You can keep her running for ever

[THEFERMANATOR]

Hey ferm let me know if there is a house for sale next to you, I'm going to move there with my 1988 merc You can keep her running for ever

Not right now there isn't.

[oteps]

pulled carbs off today between rain storms. Will clean them tomorrow. Thanks for all the advice. Docks at marina go in Thursday and have a week to get boat out of their storage lot and in water.

[oteps]

got the carbs cleaned. 1 float is lower than the other 3. I cant find any info on what the level should be. Im just going to adjust it to the same height as the others. ??

[oteps]

Im going to leave them where they are at. THey are not as easy to adjust as motorcycle floats. Looks like they will break.

[oteps]

Took boat out, runs great. Thanks for all the advice.

[bradford]

Glad you got her going.