IRS rear tune
Results 1 to 1 of 1
Like Tree1Likes
  • 1 Post By kiwi-craig

Thread: IRS rear tune

  1. #1
    Administrator KTMATVHQ Guru
    Join Date
    Feb 2008
    Location
    Auckland, New Zealand
    Posts
    4,264

    IRS rear tune

    following the sprint racing I've been further tuning the IRS rear end.

    conclusions, I had to much open gap in the rear spring cross over, result top stiff spring was staying in all the way to the bump stop, this lifted the spring rate ALLOT, okay at this venue which was pretty smooth.


    stock setup, heavier spring no cross over control

    IRS rear tune-p8181756.jpg IRS rear tune-p8301794.jpgIRS rear tune-p8301793.jpg

    revised setup with two different cross over lengths

    IRS rear tune-p8301795.jpg IRS rear tune-p8301796.jpg 140 - 165 progressive main

    updated setup, cross over locked out to provide ride height only with rider on board

    IRS rear tune-p9081823.jpg

    with my two way configuration on the cross overs, put more cross over in so the top spring locks out once I'm on the machine and it's settled down. Swapped out the 140 - 165 lb progressive mains and swapped in 120 - 145 lb progrsssives. Rear end now strokes easier and has a far plusher feel..... banged in a tad more preload to counter and hold the ride height

    IRS rear tune-p9081824.jpg

    getting there....... it's all in the setup guys.....
    owe likes this.
    KTM 505 SX: Web cams / 13.5:1 custom CP / balanced and modded crank / custom Vortex X10 ignition / Ported head / 43.5mm billet centre bored carb / KTM Akrapovic muffler / Mino hi vol water pump / 12 deg flexx's / houser stem / elka 5 / PEP PB1's and PEP LT rear / Walsh Flow A Arms / Quad tech seat & Foam / CF nose / FCI intake / relocated batt box / KTM Bill header / KTM factory SS Oil Pump setup / Manual cam chain tensioner Next round of mods: oil cooler........ the NEW TOP DOG 114 hrs…. best race engine I've owned

    KTM 554 XC
    : sx style crank, light weight SXF flywheel, TT sxf stator, steel linered cylinder, custom JE piston ceramic coating, plus 1 ported head / 807 cam, 43.5mm carb. Mino hi vol water pump. KTM Bill custom exhaust, FCI intake, JB A Arms, PEP PB1s front LT and rear , Lonestar axle, 12 deg Flexx's, CF nose, elka 3 steering damper, KTM factory nerfs, factory white plastic and graphics / gell cell battery Next round of mods: oil cooler........

    gotta stop spending $$$ on these KTM's...…..

    Polaris Outlaw 525 IRS - 2011
    , lonestar plus 2 A Arms, cut MXR front shocks (minus 1 ") with ZPS / ttripple rate, FUJ rear suspension rear shock mount units drops ride height 2", FUJ HD adj sway bar, 1.5” rear billet wheel spacers, Polaris nerfs, bumper and rear rack, Yoshi competition slip on, Pro Taper bars, acerbis hand guards, Trailtech GPS with billet protector. KTM throttle / Honda Front master cylinder and shorty lever / 41mm carb & hi flow intake runner / big filter / Billet FCR transition ring. Modified rear spring package / rear revalve.

    next round of mods: 8/33 cam, Hi Flow water pump and 540 cylinder / wossner piston waiting to go in, fastway 3 steering damper ala KTM setup, custom header using KTM XC header as a starting piece, light flywheel setup.
    gotta have something to modify this year !

    LTR 450
    , My Wife Nicola's ride & my back up mxer - 493 BB / JE piston / special order Yoshi motard cams / custom fueling map / tcs LT ZPS front end setup, TCS rear ZPS revalve / ims tank / TB exhaust / power commander / proflo - K&N / 14 deg flexx's / race nerfs / armadillo bumper/ Denton damper, next round of mods: ported head and carillo rod...... the clark kent of the ATV trio ! 210 hrs and still going strong ! the BB kit transformed this machine, it hauls the mail now !!!!

    A garage full of wheels and tires for them all........ speedway / sand / MX / cross country, over 30 at last count all on rims ready to rock

    NZ # 1 Vets champ 2013
    NZ Vets (40+) North Island MX champ 08, 09, 12 & 13
    NZ TT champ Vets (40+) 06, 08, 09,12 & 13
    Auckland ATV Club Sprint Series Champ 04, 05, 06, 07, 08, 09, 11, 12 & 13
    hope to get a good season in for the remainder of 2014.......finding time to ride being the biggest problem !


 

Sponsored Links

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Search tags for this page

polaris outlaw 525 irs factory spring settings

Click on a term to search for related topics.