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Help with performance mods I have done so far please

justplaying

New Member
Messages
11
Age
47
Location
Toronto
Country
Canada
Years Snowmobiling
10
Snowmobile
2016 Polaris Pro S 800
Hello everyone . I have a 2015 Rush 800 with 121 track. Last year when I was out with some friends on their sleds (skidoo), I was having hard time keeping up with them. I then bought a few parts to make my sled quicker and here is what I have done so far:

68 gram weights
120-310 Primary
140-200 secondary
Helix 50/44
Jaws pipe-stock can (I JUST ordered the heat shield from Jaws as well)
re-geared for more lower end (geared 1.74)

What I noticed is that corner to corner is works far better, but I can't even hit 100mph now, nor will my rpms see the 8350-8450 that I was told I need to see for this Jaws pipe to work.

Any ideas what I could change to make this better? I am pretty new at this stuff and I know there are a lot of experienced guys on here. Thanks a ton for any help offered.
 
I would dbl check your secondary for binding. Delrin washer under the cup. Put the stock secondary spring back in. How much do you weigh suited up?
 
I like your gear set-up. Check your track tension and be sure it hangs loose about 1/2" @ 16" from back idlers after being warmed up, and then be sure your belt to sheave clearance is .015" and i personally have had better success with the Polaris belts
 
I would dbl check your secondary for binding. Delrin washer under the cup. Put the stock secondary spring back in. How much do you weigh suited up?


I dont have any washer under the cup now. I weigh about 195-200 fully suited
 
What are you seeing for RPM on the top end now?
Several things you can try (48/42 helix / 140-220 spring) but since I assume you still have stock wts, drop them in first n see how it reacts.
What wts / profile are you running?
 
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What are you seeing for RPM on the top end now?
Several things you can try (48/42 helix / 140-220 spring) but since I assume you still have stock wts, drop them in first n see how it reacts.
What wts / profile are you running?


I have 68 gram weights. Not sure how to tell profile.
 
I'd throw polaris 70 series weights at it. These sleds like the weight especially in the cold weather
 
Last edited:
Hello everyone . I have a 2015 Rush 800 with 121 track. Last year when I was out with some friends on their sleds (skidoo), I was having hard time keeping up with them. I then bought a few parts to make my sled quicker and here is what I have done so far:

68 gram weights
120-310 Primary
140-200 secondary
Helix 50/44
Jaws pipe-stock can (I JUST ordered the heat shield from Jaws as well)
re-geared for more lower end (geared 1.74)

What I noticed is that corner to corner is works far better, but I can't even hit 100mph now, nor will my rpms see the 8350-8450 that I was told I need to see for this Jaws pipe to work.

Any ideas what I could change to make this better? I am pretty new at this stuff and I know there are a lot of experienced guys on here. Thanks a ton for any help offered.

You have too much helix and too much weight.

You need to go back to the beginning and change ONE thing at a time. Your gearing is great. Leave primary spring in. Take 68's out and put in 66's. Take 50-44 Full cut out and put back in the 58-44.36 heilx with the 123/202 (blue-black) secondary spring and run it. If she overrevs past the 8350-8450 mark religiously..... you have 2 options....put in the 10-68's and try it.....or back off the primary spring tension to a 120-300 primary spring. Leave the secondary alone until you get it reving where you want it.

You are loading it with the helix and the clutch weights too much.
 
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I would only change the helix from what you have listed as your setup. Go back to the stock helix if you have it, or a 48-44 fp or 46-42fp.
 


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