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Author Topic:   How often to clean carbs
SWarren posted 03-21-2002 04:18 PM ET (US)   Profile for SWarren   Send Email to SWarren  
I use my boat pretty much all year round at least once a month in the winter and several times a month during the spring and summer. I have johnsons 115's on the boat. How often should the carbs be be cleaned? I have had the boat for over 18 months and never done the carbs. When I first got the boat it ran rough, but it cleared up and runs great now, since I burn probably 60 gallons of gas a month through the engines. Any opnions?
Bigshot posted 03-21-2002 04:24 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
I periodically ran Berrymans B-12 in my tank to "clean' them out. You can do the same with Techron. Just follow directions and it will remove any varnish inside.
Salmon Tub posted 03-21-2002 05:01 PM ET (US)     Profile for Salmon Tub  Send Email to Salmon Tub     
If you are a 2 stroker, as it sounds, then I would say use Carbon Free in the gas. I use it and it keeps cylinders clean. If you have some build-up you can even double up the portion according to guys at Carbon Free and it will work like the stuff you spray into the carbs. With regular use your carbs should stay clean anyway. Carbs get fouled when you don't use engine and gas still in the carbs evaporates and leaves a film.
Ron Brassord posted 03-23-2002 09:21 AM ET (US)     Profile for Ron Brassord  Send Email to Ron Brassord     
Is it wise to run an engine dry when it will be out of service for a month or two? I recently acquired a 1993 70 hp Johnson and the manual says do not disconnect the gas and run it dry.For many years I have run small outboards, and ALWAYS ran the carbs dry to keep them from varnishing. Those engines all had gas/oil mix, and the new engine has remote oil injection. Does this make a difference?
Ron Brassord
flwhaler posted 03-23-2002 01:59 PM ET (US)     Profile for flwhaler  Send Email to flwhaler     
Yes If you have VRO or anything of the like you will fill the carbs with oil. I am from the same school of thought concerning running the gas out of the engine. I have done it to my 70 since new. The only thing one can do with the oil injected motors is keep a fuel stabilazer in the tank.


EddieS posted 03-24-2002 01:24 AM ET (US)     Profile for EddieS  Send Email to EddieS     
If you are not going to use the VRO for a couple of months drain the carbs. There should be a drain screw for each bowl on the carbs, this is standard winterizing procedures. Just make sure you catch the fuel with a bilge sock or some other absorbant material to protect the environment.


DJS posted 03-25-2002 10:14 AM ET (US)     Profile for DJS  Send Email to DJS     
Ron Brassord and flwhaler. I own a 200 H.P. Mercury. A long time friend of mine, who has owned a certified Mercury repair facility for almost 30 years, told me the same thing. DO NOT run the carbs dry. He also said use a stabilizer in the fuel, recommending that I put stabilizer in every tank of gas, not just when it is going to be stored in the winter.

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