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Author Topic:   Question on carb cleaner or decarb?
cmarques posted 03-31-2004 10:47 PM ET (US)   Profile for cmarques   Send Email to cmarques  
I have a question on using additives (techron/ b-12, etc.) in a 2 stroke engine- I did a search of the web site and am a little confused. I've had my 90 2 stroke about a year and a half and replaced plugs after a year and new filter- I want to run a carb cleaner through or do a decarb. Will adding several bottles of chemical to the fuel tank be sufficient enough to do any real cleaning? I read some past posts about running a strong mix through but don't really want to start disconnecting fuel lines and stuff. Should I just get some auto stuff and pour in or spend more $ on marine specific cleaners. Will these affect the gas/oil mix or dilute oil for improper lubing when run through. Don't want to play 20 questions but don't want to throw money away or do something stupid either.
Thanks in advance.


bigjohn1 posted 04-01-2004 05:52 AM ET (US)     Profile for bigjohn1  Send Email to bigjohn1     

Last time I did that, I used Mercury's "Power Tune" spray. It said to bring the engine up to operating temperature then let it idle and spray about half the contents directly into the carbs till the engine coughed and died. Then you continue spraying into the carbs until all the product was gone. You wait about 15 minutes, then fire up the motor and run it WOT for I think 15 minutes. It worked I think as the engine had some hours on it and seemed to run and start a bit easier. The downside in using this product was the amount that naturally gets deposited in the water around you (not environmentally friendly I suspect).

You're question.....will the above affect the gas/oil mix while the product is running through your system - yes. The better question though is, will it negatively affect lubrication...I would think not for the brief time it is running through the system. Of course you also mention the additives poured into your fuel tank....the jury is still out on them but in general, I'd say they do some cleaning of the carb/fuel system like similar products do for automotive engines.

Regarding outboard motors (whether 2 or 4 stroke), one of the best things you can do to ensure your carb does not get plugged up over time is to run a fuel stablizing product (such as STA-BIL)through your fuel system late in the season close to when you will lay her up for the winter.
This tends to cut down on the fuel turning to a gummy state while she sits there for months without being run. Its extends the "life" of gasoline which will naturally gum up and turn "stale" over time.

Understand though that even STA-BIL will not eliminate simply prevents (or lessens) the tendancy of gas to turn gummy (or leave gummy carb deposits) as it gets old. Carbon is a natural bi-product of the combustion process.

Big John

Chuck Tribolet posted 04-01-2004 07:58 AM ET (US)     Profile for Chuck Tribolet  Send Email to Chuck Tribolet     
In the OMC product line, there's a spray to remove existing
carbon, and a gas additive to prevent carbon. They say that
if you haven't been using the additive and want to start,
use the spray first to get the existing carbon out.


jimh posted 04-01-2004 09:02 AM ET (US)     Profile for jimh  Send Email to jimh     
There are many articles which mention TECHRON or other cleaners in the REPAIR/MODS or PERFORMANCE forum. The POST-CLASSICS forum tries to localize discussion of Boston Whaler boats first designed after c.1990.

It would be greatly appreciated if this discussion moved to that forum, and to facilitate that I have closed this thread here in the POST-CLASSICS forum

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