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440 snopro for the mountans
we snowmobile at 9000 foot usually give or take 1500 feet. I bought a 440 snopro 05 to let my son jump and beat up on, rather than my newer mountain sleds 2010 hcr and snopro. any advice as to what fuel and jetting I should be using, also I don't have a manual, but supposedly you can adjust the timing while it is running. Anything would help. I am not sure if you were to get an advanced timing/firing situation and it would detonate early w/ 91 octane, would it slow the ignition down at that high altitude, thus no need for higher octane, from my understanding 110 octane holds back the detonation, lack of oxygen may or may not affect the speed of the detonation. again any advice would help. I am having a hard time locating 110 octane locally.