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Granted….I’m not terribly ‘politically correct’ with use of solvents, etc…. (I’ve been known to use dirty lacquer thinner as fire starter, too…) I use regular old toxic, evil and nasty carb cleaner that you soak carbs in prior to rebuilding them. On small tanks I’ll fill ’em right up….with the remote tanks I’ll put a gallon or so….let it set a couple hours (overnight if they’re really foul), go after it with my hot-water power washer, and repeat if necessary. When it’s clean, get a small bottle of good dry-gas, put it in and shake the daylights out of it, pour out, and that gets rid of the residual water. You can go to Napa and get a Mac’s p/n 6402…it’s a gallon with a little dipping basket for about $20. Pour it back in the can after use (don’t throw it away…works just fine when it’s filthy) and use it and the basket to clean outboard carbs better than you’ve ever seen. I even use it to clean small parts & hardware. Great stuff. Don’t drizzle it on paint or decals, if you do, rinse w/water ASAP. Don’t get it on your hands…it’s caustic….and yer’ hands will stink for days.
Jim
I say "pardon me" a lot. I had a 20H, then raced open mod sleds.