Alright,i have many quads 350 raptor,400ex,250ex and smaller ones!!
But my 06 250ex has a pro circut T-4 pipe on it and some nice holeshot tires.but it for some reason revs the gears out and it like revs out and you can hear it and it does it to anyone that rides it..it still rides,but it also backfires like when you let off the gas..What should i do?or get?

 

did you re-jet with the pipe?? recheck the jetting. The pilot circuit sounds lean with that backfiring.

also the clutch may be slipping, check the adjustment

 

Did your brain realize that your tire size is smaller, effectively decreasing the engine-to-ground gear ratio? My brother did the same thing with his 250 (holeshots too!) and now I beat his pants off. Even more than before. It's not even funny. Now hes spending 270 dollars on a pipe and still won't even be close. I just slapped a 14T on the front with my tires and now it's all good. mmmmm... shaft drive....

 

Yup, sounds like you changed tire size with those new Holeshots, and the backfiring is usually a lean condition somewhere. Either the jetting is off or you have an intake/exhaust leak.