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I recently traded my atv for a 2000 gp1200r millenium edition. 23.5 hours on it. The deal is it has say in a shed covered up since 2001. I have drained the gas tank and replaced with fresh gas. New plugs,new fuel filter,new battery. Turns over great,has good compression,but it won't actually fire up unless I remove the plugs and pour some gas in the cylinders. Being the fact that it has spark,and the new fuel filter has fuel in it,my only guess is the carburetors. I'm planning on removing the intake and pulling off the carbs.

I don't know too much about these carbs. What should I do? Soak them overnight in the yamaha carb soak solution? Or do I need to dissasemble them,let them soak,and then replace gaskets and diaphrams?
 

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I think you're on the right track with the carbs. Gas has probably gelled in the carbs and you'll need to disassemble, clean and rebuild them. I don't think soaking the entire carb in cleaner will help - it's hard to clean your butt if you take a shower fully clothed. :D

See if Yamaha offers a carb rebuild kit so you'll have new gaskets - some of the existing gaskets/o-rings may not survive disassembly and if they do, may not re-seal on reassembly.
Alternately, you could pull the carbs and take them to a dealership for cleaning-rebuild. I had a 97 1200 and remember what a pain it was to rebuild the 3 Mikuni carbs.
 
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