Join Date: Apr 2012
Location: 9000 ft. ASL in Southwest Colorado, USA
Thanked 3,643 Times in 1,938 Posts
While the EFI will adjust the fuel mixture for altitude, you still end up losing about 2.5% horsepower for every 1000 ft above sea level. I live just outside Santa Fe, NM and do most of my riding between 7000 and 10,000 ft. Had mine topped out at 98 MPH yesterday afternoon, at about 6800 ft. At altitude you have to be willing to run the RPM's up where this engine is making its power. I installed an FMF Apex slip on, and pulled the airbox cover, which has helped it to breath a little better. The next change I'm going to try is a 13T front sprocket, to give 3rd and 4th gear a little more get up.