Just in case anyone doesn't know about these; I've recently discovered flush mount valve stems are an easier way to flip your front wheels around, rather than drilling another hole in the rim, and they look trick too. They have a cover that screws off then an adapter that screws into the valve to add air, any sort of specialty auto parts store (the ones that cater to all the chrome gizmos and performance parts) should have them, around $15 US for 4. I'm actually not sure if I can get that adapter into the valve while it is on backwards, but I flip mine back to normal for woods racing.

Rod
86 250R