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Author Topic:   Fuel additive
Ben posted 06-19-2001 08:26 AM ET (US)   Profile for Ben   Send Email to Ben  
I have a question on fuel additives. I have a 1977 200HP Johnson and want to run some carburetor cleaner through the gas. Is this recommended? If so how often? What brand do you recommend?. Thanks
Dick E posted 06-19-2001 11:11 PM ET (US)     Profile for Dick E  Send Email to Dick E     
You need to decarbonized that baby.
Go to your friendly OMC delaer and pickup up 2 cans of engine tuner.

With the motor in the water(no ear-muffs)take off the cowling. Then take off the cover plate over the carbs.

Then at idle 1000 rpm spray tuner into the carbs until about 1/2 is gone.
Best to have a can in each hand and spray into 2 carbs at the same time.
Then increase idle to 1600 rpm then finish spraying the balance trying to bog the engine down. Put plates back on let set at least 3 hours but no more then 16.
Take her for a spin at WOT for at 5 min.
You will see alot of smoke(carbon)coming out.
It will probably run rough at first then smooth out
If it has not been done you will probably want to repeat it.
These instructions are pretty much on the can.
This should be done every 50-75 hours or at least once a year.
Hope this helps.
Dick E

Clark Roberts posted 06-20-2001 06:36 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Ben, Dick gives good advice and the proceedure he describes will remove carbon from combustion chamber (and hopefully from the piston domes and rings) but will not clean dirty, gummed up carbs. The best way to do that is to remove carbs and put them on the work bench and carefull disassemble and clean all parts and passages with carb cleaner. This is really an easy task but messy and careful removal and cleaning takes some time... maybe 2 hrs or so... good luck... Clark.. Spruce Creek Navy
Bigshot posted 06-20-2001 10:51 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
If it is running ok and you just want to make sure, go to Wal-mart and get a can of Berryman's B-12 and follow directions. Not the spray, the liquid that you add to tank.
Whaletosh posted 06-20-2001 04:14 PM ET (US)     Profile for Whaletosh    
While I don't anywhere near the experience as Clark, I would agree that cleaning the carbs by hand is pretty easy. I did this once on a 1974 Johnson 4 cylinder. Just be carefull. I would suggest removing one carb at a time if possible. Whatever you do make sure that you don't mix the parts from one to another, and put them back on the same place you took them off.
Hank posted 06-21-2001 12:36 AM ET (US)     Profile for Hank  Send Email to Hank     
I did a carb overhaul on my '84 Evinrude 4 cylinder 90HP about 2 years ago. My recollection is that I was prepared with a carb repair kit before I attempted the job. Disassembly of the carb involves removal of gaskets, seals, jets, etc. Many of these parts should be replaced. I would check to see if carb repair kits are available for your engine from an OMC dealer. I'm not familiar with your engine but removing the carbs will probably involve disconnecting the linkages. These have to be reassembled properly for proper operation of the engine.A manual would help here.
I agree the job is not difficult but I would suggest preparation before starting.
JB posted 06-21-2001 03:26 PM ET (US)     Profile for JB  Send Email to JB     
Another small tip - if you disassemble your carb(s), jot down the number of turns it took to remove adjusting screws, etc., so you have a good place to start when you reassemble and before you adjust or sync...

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