The pistons on my 77 GS-550 had nearly 2mm of carbon build up (presumably from crummy gas ;-). Last night I sprayed them with SeaFoam deep creep.. and used a brass brush and got nearly all the carbon off in less than 5 minutes. There were some spots of heavy deposits, so I'm letting them soak now.. I expect it'll be super easy to finish up in record time ;-).
The regular SeaFoam (non spray can version) is used as a fuel system cleaner, fuel stabilizer and probably other things. You can pour it in your intake (preferred method is suck it in via a vacuum line), let it soak and when you start up 10 minutes later.. you'd be amazed at the cloud of crud that comes outta your engine (stay upwind!).
It seems to be available at a lot of places, Napa always carries it (AFAIK) and I've noticed it almost hidden at chains like AutoZone, way up high..
Good for loosening up bolts too...
And no, I have no affiliation with them...;-). The Bandit mailing list introduced me to SeaFoam years ago.. and I've been a convert since. I usually try to run a can through all of my vehicles once a year just for the heck of it.
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