Dirt Bike Tube Valve Stem Nuts
Doing that can pull the valve stem too high into the rim and cause the valve to tear away from the tube and or cause a rip or puncture.
Dirt bike tube valve stem nuts. You do not want to tighten the valve stem nut down to the rim because the tubes walk inside the tire. The valve stem is vulcanized to the tube and can be torn off if the tire spins on the rim so be sure the rim lock is properly installed. Adam jason show proper positioning of the valve stem nut on dirt bike tires. I suppose to keep the tube off the inside hole edge if the tube moves round.
I use nuts on road bikes even if they aint too fast and no nut on dirt bikes so valve stem can move around it s no fun trying to race on a flat even if you are in muddy conditions never tighten nuts right down though it can stress the stem to tube connection finger tight plus one flat should be more than adequate. Never tighten the nut on the valve stem down to the rim. When i changed the rear tyre the valve stem nut was on the inside of the rim done up to the bottom of the stem. This will keep your tubes from ripping at the valve stem in the case of movement in the tire.
The guy i bought the bike of raced enduro events and was quite good. Using a presta valve on your mountain bike.