Today I put on a 15 tooth counter-sprocket (14 is stock) and hit 84.0 MPH on the Banshee. With stock gearing I could hit 82 MPH. Wind resistance is very significant at these speeds so I think that 84 is all I'll get with gearing changes in it's current configuration. And, no, that wasn't down a hill or anything.

 

what mods you have

 

I hope you have some engine mods, because a Banshee with Pipes, filters and gearing will only do about 78-80mph on flat piece of ground.What mods do you have? How did you get a mph figure?

 

Mods are only Toomey pipes, K&N, Reeds and 15 tooth sprocket. Measured with a Garmin GPS III on paved road. I actualy did a few different runs and it came out the same both directions. Ground was flat.

 

ya that sounds about right

 

Hey WYO, who makes the 15 tooth countershaft you are running?

 

Thats real strong for a Banshee, I have almost those Identical mods on my 99 Shee and the best I have got out of it was 82mph, but that was when it was real cold and the engine was fresh. In this summer heat and humidity I would be happy to see it go 79.

 

I got the sprocket from Rocky Mountain ATV. It's made by Primary Drive and cost $6.99.

With the stock gearing I could do 82 MPH pretty easily; the limiting factor seemed to be engine RPM. It just wouldn't rev any higher. When I did that on a slight downhill I still hit 82 MPH; same as level.

Yesterday when I did these tests it was fairly warm; in the 80s and no humidity. I couldn't rev out like I could with stock gearing which tells me that I am now being limited by wind resistance.

Also, bear in mind that these runs are taking place at 7000 feet altitude. While you lose power you also have less air ressitance. Power loss due to altitude is fairly linear but aerodynamic drag is not; it's more of a geometric progression. With that in mind it would make sense that you can get a higher top speed at higher altitudes than lower. My theory at least.

By the way guys, I'm not one to make up stories. I'll take a picture of the GPS and post it on my site later today if that will help. It's not solid proof but is't something.

 

Hey Wyo,
Great Web site. My last trip to St.Anthony I crashed and burned, froze and melted. Still had a good time! It would be fun to see what my Banshee 404 does when I get it back from Vito. While shee is down I've been having a lot of fun with my Blaster. Vito helped me get a bigger blast out of it.
Have you taken your front fenders off during the speed runs?
I was going to get a couple of Primary Drive sprockets this week because they are so cheap. How is the quality?
Ride on..

 

Yeah I'd like to know too, how are the sprockets holding up?