Posts: 3504
Location: Elk River, Minnesota | The other option to get a really good deep cleaning is to get a can of sea foam that is pressurized.
Remove the air box so you have access to the carb throat after bringing the motor up to temperature. Then, perform the following:
1. Set your motor to high idle
2. spray sea foam directly into the carb throat in short spurts. The motor will start to sputter and blow white smoke.
3. After about 2 - 3 minutes of short spurts, start a continuous spray into the carb until the motor kills. Continue to spray more into the carb for a short time.
4. Let the motor sit for 30 minutes to an hour.
5. Take the motor out and run it clean. You will have a bunch of white smoke to begin with, but it will burn off in short order.
6. When you are all done, replace the spark plugs. At times, this procedure can kill a plug due to all of the carbon you are burning out. Easy, cheap, and is good insurance.
This should get at gunk in the carb as well as clear out any build-up in the combustion chambers.
You may want to try this first before adjusting the needle screw. If it just a touch of varnish, this should take care of that...
Steve
Edited by VMS 4/14/2013 7:07 AM
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