SOURCE: 1998 yamaha bear trackers 250cc , What causes gas
The float is stuck open. Try tapping the side of the fuel bowl to see if you can dislodge what my be in there making it stick. The best thing to do is to take the carb off the bike and disassemble it and clean it.
And when you put the carb back on put a in line fuel filter on and this will help out in the future.
SOURCE: I have a 2003 yamaha
I suggest you check where the ground cable connects from the battery to the frame - this is a common point of failure. This sounds like a connection issue to me and since it affects the entire machine, it's likely a common connection high up in the electrical chain of command (so to speak). Possibly even the connections at the battery.
SOURCE: why does my Yamaha bear tracker rev high after starting?
Sounds like a bad air intake gasket going bad
SOURCE: HY DOES MY YAMAHA BEAR TRACKER REV REAL HIGH WHEN IT STARTS
If above does not help, also check throttle cable isn't sticking wide open - I had one bike which water got in and my throttle jammed every time the weather turned cold, the water froze, and the cable stuck! (can also be grit etc)
SOURCE: How to remove valves on a Yamaha 250 bear tracker
REMOVE VALVE RETAINERS VALVES SLIDE RIGHT OUT..
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