Bought an F7 a few weeks ago...rode it one weekend (500 miles) & was thoroghly dissapointed with the sled. Well thanks to all the helpful people on this site the sled has come around for me! Rob & Dan have been great with all of their knowleadge & willingness to help. I had a bunch of problems from lack of top end to suspension/handling issues. I spent about 30 minutes taking advice from this site & made the recommended adjustments. I took the sled down to the lake early yesterday morning. Perfect conditions 15 degrees, no wind, smooth hard pack snow. Well my top end went from a previous high of 90 to 110! I ran the sled pretty hard I made about 10 passes none longer than 1 mile & averaged between 107-110 consistently. The sled is a bone stock standard green F7. Thanks for the help everyone!!