Join Date: Nov 2014
Thanked 47 Times in 47 Posts
ATV: 2008700SD and 2002 400 FIS
If you get your 400 running 100% , it will keep up with a 500, or darned close. I had a 500 with a Web Racing cam, 5 degree timing advance key, gutted exhaust, Dynojet stage 1 kit and had the carburetor tuned with a wideband. It was very torquey, and I was able to run 30" Mudzillas. It would top out over 60 mph on the gps. But, I'm pretty sure if you did the same mods to the 400, it would do nearly the same. I think you are right about up sizing the 500, but there is a lot you can do to the 400. Las week my business partner bought a Royal Enfield 500 Bullet, he said let's go for a ride, see if you can keep up. I ran my 400 wide open for 10 miles, it has 27" MST's. My buddy couldn't get by, said I was going 60, and his bike got wobbly above 60. My speedo read 53-55, btw. I only have a Dynojet stage 1 and gutted muffler. There are posts for around 2011 about putting the 650 top end on the 500, you'll have to search. My 500 dynoed at 29.5 rwhp which = 38-39 crank hp. The 650 H1's were only about the same.
2008 AC 700 Diesel and 2002 AC 400FIS
Last edited by Wallamatogus; 06-18-2017 at 07:12 PM.