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Yeah I've been doing that every 5,000 miles for the last couple of years. Haven't been using any specific brand of additive, just whatever catches my eye on the store shelves. One bottle is usually good for 20 gallons of gas, so I just dump a little in for 5 or 6 tankfuls. But without pulling the head, I have no idea what kind of carbon buildup I might have.
An Harley mechanic teached me two tricks to clean carbon residues from thermic group.
One is the use of nebulized water. A common spray bottle with water sprayed in front of carbs mouth without airbox or with airbox open, and engine running at mid-revs.
After a while you'll collect a black cream from exhaust pipe.
You've to repeat some times.
The other one is the additivation of carburant with acetone.
Acetone is a good solvent used for paint and cleaning.
Lot of people add acetone to obtain better power like the use of a 100 octane premium carburant, clean engine, and better fuel mileage.
http://peswiki.com/index.php/Directory:Acetone_as_a_Fuel_Additive
Ah it's also important to relocate oil vapors out from airbox. Lot of carbons comes from burned engine oil.
The first thing I do on an Harley is to mount an horse shoe pipe with pipe and breather filter to let heads free breath oil vapours.
Last edited by Mechano; 03/19/2007 12:55 PM.
