Extending the SBA to a 159 gearing help!

[jake432]

So I am extending my dads SBA to a 159 due to him weighing about 260 pounds, being 52, and he loves that sled and we have had not a single problem so he does not want to buy a 163. We got the kit from tracks usa for 500 bucks (how can you beat that with extensions and track). So my question is being that I am extending it to this length what should I do to the gearing? Will it be fine stock? Should I switch all of the gearing and the chain to a 163 gearing? Or can I get away with changing just a top or bottom gear?

Any advice would be gladly appreciated.

Sorry to edit I just noticed that the gearing is the same for the 163 and the 144 sba so I should be ok right?

Thanks Jake

 

[COP-OUT]

gearing change

I have an 04 edge 800 with a 159. The stock gearing was 19/39. I changed it to 19/43. The reason is because I weight a lot and have added a pipe & can clutch kit Etc. It help with track speed when climbing and keep the belt running cooler. The only thing I noticed is the top speed on the trails was cut down some.
I also have a 13 Pro RMK, if someone ever make different gearing that's a direct bolt on I am going to change it to a final drive ratio of something like 2.40 from the 2.05 or 2.09 forgot which one is stock. that's stock on the 800 pro's with the 163 track.

Hope this helps.

 

[Lind]

the '12 switchback assault gearing/clutching is very similar to the pro rmk gearing/clutching minus the driven helix at 8k-10k feet.

i also run that 159 kit out west using the switchback assault gearing/clutching and it worked great, pulled 8200-8400 rpms depending on conditions.