Hubert rode the highest motorable road in the world, Khardungla Pass in the Himalayas. His GPS tracked it to 17,610 ft, they claim 18,380, but hey who's counting?
Climbing Khardungla I mainly stayed in 2nd gear, shifting down to 1st on the steeper grades. I adjusted my carbs for the altitude (Main Jet 118, Idle Jet 38) which allowed me to ride the full pass without disconnecting the air filter. Hubert