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Help with performance mods I have done so far please

Discussion in 'Rush/Switchback' started by justplaying, Dec 4, 2018.

  1. justplaying

    justplaying New Member

    Messages:
    11
    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.
     
  2.  

  3. Chiefcheese

    Chiefcheese Active Member

    Messages:
    235
    Location:
    Wisconsin
    Country:
    USA
    Years Snowmobiling:
    45+
    Snowmobile:
    15 Anny Rush 800, 16 PRR LE Switch 800
    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?
     
    justplaying likes this.
  4. Jesusfreak

    Jesusfreak Active Member

    Messages:
    155
    Location:
    Maine
    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
     
    justplaying likes this.
  5. justplaying

    justplaying New Member

    Messages:
    11
    Location:
    Toronto
    Country:
    Canada
    Years Snowmobiling:
    10
    Snowmobile:
    2016 Polaris Pro S 800

    I dont have any washer under the cup now. I weigh about 195-200 fully suited
     
  6. ZR SLEDHEAD

    ZR SLEDHEAD Active Member

    Messages:
    143
    Location:
    TORONTO
    Country:
    Canada
    Years Snowmobiling:
    30
    Snowmobile:
    '16 800 PRO S
    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?
     
    Last edited: Dec 5, 2018
  7. justplaying

    justplaying New Member

    Messages:
    11
    Location:
    Toronto
    Country:
    Canada
    Years Snowmobiling:
    10
    Snowmobile:
    2016 Polaris Pro S 800

    I have 68 gram weights. Not sure how to tell profile.
     
  8. Jesusfreak

    Jesusfreak Active Member

    Messages:
    155
    Location:
    Maine
    I'd throw polaris 70 series weights at it. These sleds like the weight especially in the cold weather
     
    Last edited: Jan 7, 2019
  9. sixpack

    sixpack Member

    Messages:
    50
    Location:
    saskatchewan
    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.
     
    Last edited: Jan 17, 2019
    justplaying likes this.
  10. racerdave

    racerdave Moderator Staff Member Moderator

    Messages:
    1,060
    Location:
    Will County, Illinois
    Country:
    USA
    Years Snowmobiling:
    since 1976
    Snowmobile:
    AXYS Switcher 800,Indy600sp,XCSP600ves
    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.
     
    justplaying likes this.
  11. Polaris man

    Polaris man New Member

    Messages:
    6
    Location:
    Prince Edward Island
    Country:
    Canada
    Years Snowmobiling:
    40
    Snowmobile:
    2016 Polaris Assault
    I have not heard about polaris 70 series weights. What are they?
     
  12. Jesusfreak

    Jesusfreak Active Member

    Messages:
    155
    Location:
    Maine
    Excuse me, they're actually stock polaris weights 10-70's is what I meant
     
  13. Polaris man

    Polaris man New Member

    Messages:
    6
    Location:
    Prince Edward Island
    Country:
    Canada
    Years Snowmobiling:
    40
    Snowmobile:
    2016 Polaris Assault
    Ok thanks
     

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