I'm with you -- I hate badges and stickers on my bikes. There are different methods, I'll just list how I did it.
Use a hair dryer (NOT A HEAT GUN) and warm up the decal. This could take a couple of beers. After about 15 mins. of this, start to try and gently lift one end of the decal off the surface -- it will be goopy and tough. Use some dental floss as a 'saw' and use it behind the decal to sepaerate it from the surface, only a BIT AT A TIME. Then do some more heat, then floss, then heat, then floss, etc.
Eventually, the whole thing will come off.
Then, you have to take off the goop that's left.
Soak it in some kind of chemical. Many will suggest WD40 and/or Goo Gone (latter found in Crappy tire). I've tried these. They result in a lot of finger work, calluses, etc. If you go this route, aim for a couple hours heating, then rubbing with fingers (a cloth won't give the same type of gentle, yet effective abbrasion).
However, I did find a miracle chemical called "super degooper". It's found in the paint solvent ailse in the Home Depot. Honestly, I tried the WD40 and Goo-Gone with a cloth -- and nothing happened. Then I tried the two chemicals with my fingers and eventually it came off, but 3 weeks later, my thumbs still don't have all their skin back (seriously).
With this Super Degooper, I soaked the gummy stuff, let it sit for a couple minutes, then rubbed it circular with a "degooper" soaked rag quite gently, and you could see the stuff coming off instantly.
Turned a 2 hr. job into 15 minutes. I used it on both the tank and some plastic -- no harm done, no marks. Mind you, as soon as it was all off, I gave the surface a good scrubbin' with soap.
I rubbed it a bit with my thumb to warm up the glue, then I peeled one end up with a finger nail, then striped it right off, a little gentle rubbing with my thumb took off any extra glue, then a quick wash and a fresh coat of wax. Can't even tell it was there.
Of course I'm generalizing from a single example here, but everyone does that. At least I do.
Fishing line works better than floss IMO...seems floss these days just aint made like it used to be.
2002 Buell Blast 500 /¦\
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[url=http://www.totalmotorcycle.com/BBS/viewtopic.php?t=11790]Confessions of a Commuter[/url]