High elevation clutching

[Kguild19]

Hi all,

I have a 17 Pro-RMK 800 163 2.6 with a quiet can. I originally had 10-64 weights and swapped them out to 10-58 weights. It works great for high altitude 11,000-12,000ft but we also spend a lot of time in the 8,000 to 10,000ft elevation. When in this elevation, I feel like I am getting a lot of belt slip. I have been thinking of going back to the 10-64 weights for squeezing pressure and using the SLP Blue/Pink primary spring for the extra rpm. I am relatively new to clutching and would like to get everyone’s opinion before I head in the wrong direction.

 

[SRXSRULE]

10-64 = 6-8k ft
10-62 = 8-10k ft
10-60 = 10-12k ft

The factory clutching does work pretty good with the correct weight for your elevation, but your not going to be able to have one set-up that will cover a 4,000 ft swing and still have it turning peak RPM. you have to either switch weights for the different riding areas or go with a weight in the middle that will cover both and just know that its going to over-rev at 8,000ft and be down on rpm at 12,000ft.
Clutch for the elevation that you spend the most time at.

 

[M8onEdge]

I'm sure you know you can buy adjustable weights.....

 

[Kguild19]

how would the slp blue/pink spring affect rpm? Is it a minimal RPM gain?

 

[nosman4]

100 RPM on the top end maybe. You are better off with the correct weight as trying to compensate 200 or more rpm with a spring sacrifices efficiency.

 

[Kguild19]

My primary riding area 95% of the time, will be in the 10,000 to 12,000ft elevation. Will the 60 Gram weights make much of a difference compared to the 58 gram weights?

 

[AdrenalineAddict]

One direction you can go that will develop a little more squeeze is to replace the stock 155/222 black secondary spring with 160/240 black/purple, bump your weights back up to 10-60 and all should be well. I ride 10,000 to 11,000 quite often and the 10-62's are questionable at 11,000' depending on snow conditions and air temp. Another huge gain in performance for the Axys 800's is to deglaze your primary and your belt on occasion, makes a world of difference. The black/purple will improve your high elevation backshift substantially, the only difference you will see is sacrificing 1 or 2 MPH in a road race. I have always struggled maintaining RPM at 10,000-11,000, especially in springtime air temps, I finally switched to the black/purple spring and found my clutches stay cleaner longer and I can ride all day without cussing at my sled because of RPM loss. I would also stick with the stock 120/320 primary spring, works great with 10-60's, 62's and the straight 40.