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My HO will do 60 mph at an elevation of 3000 ft. I have never tried it at sea level but I would think it would do around 65 mph. It's about 3% loss of power for every 1000 ft.
Hope this is of some help.

 

I live at 350 abve sea level and it will do 60 mph.

 

Mine does 60 also according to the speedo whether it be a 1/2 mile or 3 mile straightaway.

 

I see this post now Im starting to wonder . My 03 Sportsman500 HO Im only getting 45mph .What max RPMs are you getting out of the tach in Nutreal. I relize Ive only got 3 hours on it but it seems like its starving for something air or fuel no smoke just dsnt sound right.

Kevin

 

I ride at 2500 ft and can do 60 mph according to my speedo and my GPS

 

<FONT style="BACKGROUND-COLOR: #c0ccd8">Mine also tops out at 60 no matter the distance. Could it be that this is all the clutches are capable of shifting out to??</FONT>

 

Wow, I can do 60 quite consistently at 5000 feet (Colorado) with my '99 Xplorer 400 4x4

 

Cheezhead, this is a bad idea!!!!!

 

I had my stock sp500 HO clocked at 67 mph at 500 ft above sea level