ARP head stud kits for ktm rfs
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  1. #21
    Senior Member KTMATVHQ Guru
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    Jan 2011
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    Bella vista ,arkansas
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    Not using a tithing on mine. I'm back down to 40lbs also. But my new head has Oring in it now
    637
    8/10 cam or stage 6 depends on who you but it from
    plus 1 head
    slingshot lock up
    fci intake, 43.5 carb
    plus 8 swingarm
    ktmbill exhaust
    JJ&a play axle
    high flow water pump
    direct drive spindle mounts (thanks nmachine)


    http://s1107.photobucket.com/albums/...rrent=drag.jpg

  2. #22
    Senior Member KTMATVHQ Member
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    Feb 2009
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    329
    Quote Originally Posted by kiwi-craig View Post
    guys are you using moly grease on the head stud nuts or just engine oil ? Slotting mine in today…… just checking………. Think I will stay with 40 ft lbs
    40lbs head bolt torque at the compression you are running is fine. Anything over 13:1 and you need to increase it. We blew several head gaskets at 14 and 16:1 until we increased the head bolt torque past 50 ftlbs. The clamping force needs to be higher with the increases in cylinder pressure that comes from increases compression. The heads are sturdy enough that the extra torque will not warp the heads. a little moly on the threads is a good idea.

  3. #23
    Senior Member KTMATVHQ Guru
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    i use molly lube. blow out the holes and go easy on the case threads. for the top threads i put moly on both sides of the washer and threads.
    99mm thumper cylinder 15:1 comp, Crankworks billet stroker, Custom Carrillo short rod, Racers edge +4ti head, 48mm hsr carb, Shortened and stretched trx fci intake, Custom programmed vortex

    296lbs ready to ride. This might be the fastest ktm duner in the world

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  5. #24
    Senior Member KTMATVHQ Member
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    Quote Originally Posted by 5.0fox View Post
    i use molly lube. blow out the holes and go easy on the case threads. for the top threads i put moly on both sides of the washer and threads.
    I do the same and only install the studs finger tight. There is no reason to tighten the studs beyond that.

    Just and FYI; The newer style stock bolts are torque limiting bolts. That's why they are turned down in the middle they are designed to "break" when you reach 40ftlbs. And why they feel springy if you try and torque them past 40lbs. The problem with this type of bolt is they stretch through the middle. If they do stretch or are over torqued they loose a small amount of there holding power.

  6. #25
    Administrator KTMATVHQ Guru
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    cool thanks guys, all in and snugged down. Need to get this engine up and running reliably thats for sure………..
    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 !

  7. #26
    Member Rookie
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    Nov 2013
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    A small town in Utah
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    Are they available on the 505sx? If so would any of you happen to know the part number?
    2009 KTM 505 SX. FMF KTM PIPE, TRAIL TECH COMPUTER, OHLINS STEERING STABILIZER. ORANGE CHAIN. WHAT MORE DO YOU NEED?

  8. #27
    Senior Member KTMATVHQ Guru
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    May 2009
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    Western WA
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    Travis may be able to get you some. When I originally got these part numbers I measured the stock bolts and head and bought them based off the bolt specs. If travis cant help you out I may be able to get you some.
    99mm thumper cylinder 15:1 comp, Crankworks billet stroker, Custom Carrillo short rod, Racers edge +4ti head, 48mm hsr carb, Shortened and stretched trx fci intake, Custom programmed vortex

    296lbs ready to ride. This might be the fastest ktm duner in the world

  9. #28
    Senior Member KTMATVHQ Guru
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    Jun 2010
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    1,020
    are these direct bolt in or is thier machining to the cases needed?
    2009 KTM 525XC #841

    Brad Mulvey Mod SX arms, SX axle, SX brake lines, KTM Big Nerfs, KTM Hood, Motoworks SR4 slip on, akro manifold, ESR heat gauge, 42mm bored carb, hrc kit, YFZ float bowl w/ adjustable leak jet, FCI "like" Intake w/ RC-5000 K&N filter.

  10. #29
    Junior Member Rookie
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    Feb 2018
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    Vale, oregon
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    2
    Sorry to bump an old/thread but are these available for the 09 and up 450sx and 505sx?
    Sorry I'm a KTM convert/newb.
    09 450sx bone stock, still faster than you boyfriend's Honda!

  11. #30
    Senior Member KTMATVHQ Addict
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    May 2009
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    Yuma, AZ
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    Quote Originally Posted by Supertrav2 View Post
    Sorry to bump an old/thread but are these available for the 09 and up 450sx and 505sx?
    Sorry I'm a KTM convert/newb.
    There is a kit FS on ebay right now:

    https://www.ebay.com/p/KTM-450-SX-XC...50786666&rt=nc


 
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