I am new to snowmobiling except for the couple or few times that I rode in '79-'80. I've been on dirtbikes, mostly MX, since '72. I still don't understand the reasoning behind the thumb throttle. I went for my first ride of the season today('04 Adrenaline 600 sdi), for about 1 1/2 hrs. I think that it is stupid that I have to take my thumb off of the throttle to put my hand on the front of the bar, then pull it with my finger, every time I brakeslide a tight right hander. What is wrong with motorcycle-type twistgrip throttles? Besides, I am in more pain in the right thumbular area today than Mrs. 00' Machz&mxz claims to be.