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Sound`s like the float valve in the carburator is sticking or not seating properly,allowing the bowl to flood and run over into the intake tube from the carburator to the engine.

When you have it parked for a few days,is there any gas on the ground under it or is there any kind of a gas smell around it before you crank it.
If so you probably need a new float plunger valve.After letting one sit for a long time with the gas valve opened on the side of the motor,the rubber tip on this valve will develope a ring around where it has been up against the valve seat.And it will not seat right when the wheeler is parked for a few days.

Until you get it fixed! I`ed just turn the gas valve to the off position when you park it for awhile to keep it from flooding.It will eventually get bad enough that after you stop riding ,and let the wheeler idle for a little bit it will start missing because of the flooding.
 

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I have had the same problem, It happened when spinning 360's on the ice, it took about 3 times of this happening to figure it out, I could get this grizz spinning so fast my you would almost get sick.....no kidding
bob
 
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