Your oil ring is definately blown, one easy way to check is put the front of the quad against a solid object like a wall, put it in gear and slowly let the clutch out (putting a load on the motor) if oil starts to pump out profusely then thats your problem, needs new piston and rings.

 

Gaskets are around 25
Piston/rings 75-100
bore/hone 40-45

Think of it this way, you will gain a hp or two if you drop a better piston on there [img]i/expressions/face-icon-small-happy.gif[/img]

 

We got the stalling problem fixed on my dads warrior. THe yamaha shop told us it was the inner coil. So now it runs just fine and doesnt stall. But the bad thing is that it still blows oil out the crankcase breather filter. Does anyone have any idea now what the problem could be? THanks for any help.