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I Have a 1991 Phazer II STR that I want to make more ridable for a young rider. It hits too hard out of the hole for him. I wondering if I should change jetting(fatten it up) or clutching(spring,wts) or gearing changes, to mellow it out. The sled is going to be used by grandma as well, so I really need to find a way to not rip her arms out!. The sled will be run at 9000 to 12000 ft. thank you for any advice!