Yesterday I took my ‘76 CT 90 on a ride up to the top of Mt Bill Williams just North of my home in central Arizona. The road is a dirt Forest Service road about six miles from the base to the top of the mountain. Not particularly gnarly as far as Forest Service roads go in terms of rocks, ruts, and roughness but challenging to me. The beginning elevation is about 7200’ and the top is 9259’ which is just a very crowded antenna and fire tower site. The bike performed as I expected, pure grunt and amazement. Can’t be sure from my notes but it has either a 58 or 62 main jet on the middle clip with a 35 pilot jet. Regardless, it runs flawlessly at my home elevation at 5200’ and similarly at above 7000’ where is spends most of its time on trails. Really nothing substantially unexpected at the 9200’ level, it still has the grunt in low range to go wherever I want to roam. Most of the altitude gain/loss occurs in the three mile section where there is a gain/ loss of the majority of the 2000’ difference. Rough calculation of about 12,000’ density altitude with above normal temps, 72°. Not too shabby for a seven hp (new in 1976) unmodified CT 90. Ride and Grin.
