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rear tube keeps popping

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hello, yz 450 rear tube keeps ripping under valve stem nut, i used duct tape to wrap rim but still gets flat , also read in magizine that if you loosen the top nut half way on stem it helps, but still rips in same place, i only run heavy duty tubes, anybody have advice or hints that will help, thank you for your time, ---jah lives---

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Do you use any baby powder in the wheel? It's suposed to let the tube shift around some without binding. Your rimlocks should be snug not super tight.

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Have you checked that there are no "burrs" or rough edges on the valve stem hole on the inside of the rim?

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Had the same problem with my 426... Every time I would go out to the track almost, I would come home with a flat. Mostly happened to me in the whoops, put a hd tube in and made sure there were not any rough edges in the rim and didn't have a problem after that... Make sure to check the inside of the tire for a sharp piece of something that could have made its way in there :) Good Luck :)

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Also I would chuck the valve stem nut. If the tube/tire move on the rim then the stem can go along for the ride.

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