weird...

Have a carb off an '07 Big Bear 400 that sat a couple of years, probably more.  Friend asked me to clean it, which I did, soaking the jets and spraying out all of the ports with carb cleaner as best I could.  Replaced o-rings, needle valve & seat, tweeked float level.  Bike starts and idles well but doesn't want to pick up above 1/4 throttle.  That would appear to be in the slide needle range.  Main jet is clean, needle is clean and straight, diaphragm good.  It seems I saw (in a diagram) a port that comes into the slide needle area from the side.  This would be in the carb body between the main jet and the throat of the carb.  I would like to soak the carb in Gunk Carb Cleaner, the gallon paint can with a little basket.  Curious what Mikuni uses for bearings and seals in the throttle shaft.  I'm guessing HDPE or Delrin, or maybe brass; not sure what effect Gunk would have on the polymers.  Has anyone actually soaked a carb in Gunk??  First hand knowledge, please, and what effect, if any, on the carb.  Pulling the throttle shaft out would be a last resort.  Getting the butterfly screws out and staked back in would seem to be a nightmare.
Thanks
Jim

I have a mid 2000 sportsman 700 that only works in low gear.  Any thoughts?

Hey guys, I know a 2000 Yamaha Big Bear 400 4x4 5 speed single range transmission is model: YFM400FM
But what is the model designation for: 
2000 Yamaha Big Bear 400 4x4 "Professional" 5 speed dual range transmission...   YFM400F??
VIN decoders don't seem to work for this Yamaha I picked up.

Just bought this Honda quad and when I first drove it the steering seemed very hard.  Those that I talked to said that's normal as it's full time 4 wheel drive.  Well yesterday while looking from the front is looked like the front tires were pointing out quite abit.  I measured the toe and was toe-out by a little over an inch.  Yikes so this morning decided to try an adjustment and after an hour or so had the toe-out to 1/4".  Took for a test drive and the steering was alot easier, still not like driving a 2 wheel drive but made a huge difference.  There are differences as to what the toe should be set to but so far this seems to do the trick.

Anyone know how to change our display names ? Is search on the forum but can't find anything.