ARP head stud kits for ktm rfs
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  1. #1
    Senior Member KTMATVHQ Guru
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    ARP head stud kits for ktm rfs

    Just got together with ARP and came up with some studs and nuts that work to replace the factory head bolts. Allowing a little more clamping pressure and less wear and tear on the case threads. Retail is about $50 for the 4 studs with nuts and washers. Here are the ARP part number:
    Stud AM6.770-1b
    nut AMN12-1
    washer AMW750n
    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

  2. #2
    Administrator KTMATVHQ Guru
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    sweet, so just order those # up from ARP direct ?
    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 !

  3. #3
    Senior Member KTMATVHQ Guru
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    Yup those are the arp direct part numbers. If they wont ship international Send me a pm and Ill get you fixed up
    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. #4
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    looks like I'll be placing a order. Whats the TQ value on these?

  6. #5
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    I can't remember the value but we been torquing to 60. I think I'm gonna go back down to 40. Once I get the new billet cylinder
    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

  7. #6
    Senior Member KTMATVHQ Guru
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    I torque these to 45 ft lbs. Any more and you risk warping the head or cylinder sealing surfaces. The studs have finer threads that create more clamping force for a given torque spec.
    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

  8. #7
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    The early 2000 KTM rfs's came with studs. I have a set here with the nuts if you want them. Clamping force will be identical. Lots of threads in the block. Cannot imagine damaging them myself or exceeding the 38 pounds torque but...... Make sure you anti seize or oil any threaded fastener. And tap the case holes and blow them clean. And wire wheel the threads on any fastener. I use anti seize on both sides of the washer under the normal head bolt.Btw the 2007 and up head bolts suck. Too thin in the middle. Pulls torque funny. Removed most of them and use the 2001 to 2006 bolts which "feel" right when torquing them.I have them also if you want. Cannot think of any real advantage for studs myself regardless of threading. O ring the head and cylinder top and use a copper o ring if 14 to 1 is the drag racers way. My liner guys add a .001 lip on the inner edge of the cylinder. You can feel it with your finger. Not flat on the top on purpose. No issues

  9. #8
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    Man free parts. Are you kidding don't you want to mark your stuff up70% ?
    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

  10. #9
    Senior Member KTMATVHQ Guru
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    here you go bob. Also reduces wear and tear on the case threads.

    Head Bolts vs. Head Studs
    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

  11. #10
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    Quote Originally Posted by 5.0fox View Post
    here you go bob. Also reduces wear and tear on the case threads.Head Bolts vs. Head Studs
    How often do you plan to take this down? We studded engines 45 years ago. You must remove the stud to pull the top end. I have worked on a buch of factory race motors. Non are studded. Go ahead. Same thing as the bolt. A normal rule of thumb in aluminum is you need 2 1/2 either turns of the bolt are the same in depth versus the diameter of the bolt. Bolts go way deep in the cases. Harder to drop the cylinder over the cam chain guides so I put them in last. Head on. Also with the studs in and the chain guides in how do you insert the piston pin clips? I have learned to install the piston in the cylinder then slide the pin out to the cam chain side and tilt it forward so I can access the pin to put the clip in. Would be really hard in a vertical position with the studs and chain guides installed. And I use a bux tool c-clipper. Harder to install the studs later as there is not enough threads showing to double nut the exposed stud or use a stud installation tool.Try to install the cylinder over the studs and cam chain guides with a loose piston. Ring compressor is under the cylinder. No gap unlike the ceramic KTM factory ring tool shown in the parts and special tools for your engine. If you are installing a aftermarket piston with its three piece NPR oil ring setup you will break a few before you figure out you need four experienced hands to do the install.So an oil less Pre installation of the piston into the cylinder using total seals quick seat instead of oil which allows the piston to slip out of the cylinder too easily during installation makes it hard to break the thin oil and compression rings during assembly. I could do it my way using studs but you will become frustrated quickly. And remember my post. You would need the bux tool c clipper piston pin clip installation tool to put the clip in with studs in the way. KTM removed the studs after a 1,000 engines as they were a pain.IF you wore the holes out you could Timesert the hole in steel. Last forever. Sorry I do these everyday. I tried the studs for years. That's why I have them here to give away. I remove them from any early 2000 KTM I see.The fiche does not even show them any more. Bolt only. The stud will not hold the thing together any tighter as far as I know. I tried and the bolts will take much more torque than the spec but you may bend the head casting itself. I have seen case tops not flat from over torquing the head bolts. A "dip" between the bolt holes in the case. Put a straight edge across the cases. I have seen some where a .009 feeler gauge can be inserted under the straight edge between the holes. You can pull the cases "up". Was not designed fir more than a percentage over the spec torque. O ring the head and cylinder instead.

  12. #11
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    Well when you don't hold a head gasket you change everytime you ride lol. I also put piston in cylinder first. Then slide onto rod. But I leave my studs in. There's enough room on a ATv to remove head and cylinder. To have to do it in a sequence. I also don't have the c clip tool I wish I did. But it's a doable. My experience with the stock bolts are they stretch some and everytime I've put on a 570 kit with mls I have to add a few lbs to get it not to leak. I don't think there made for alot of torque.
    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

  13. #12
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    Quote Originally Posted by flooringit View Post
    Well when you don't hold a head gasket you change everytime you ride lol. I also put piston in cylinder first. Then slide onto rod. But I leave my studs in. There's enough room on a ATv to remove head and cylinder. To have to do it in a sequence. I also don't have the c clip tool I wish I did. But it's a doable. My experience with the stock bolts are they stretch some and everytime I've put on a 570 kit with mls I have to add a few lbs to get it not to leak. I don't think there made for alot of torque.
    Would you like a set of the thicker older head bolts? Swap for the thinners when you get them out again. Do not use the mls gaskets myself. Have cometic make up a few fibre 102's and use 518 on the gasket. Unless you need copper o rings. 13.5 and up normally needed o ringed parts.

  14. #13
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    Been plenty of quys blowing gaskets in quads of all types when running big bores strokers etc. 660 / 700 raptors. YFZs and others

    ARP studs fix the problem everytime

    SX are also prone to pulling threads in the cases. Inserts are the fix there.......

    Inserts and studs seem to be the needed setup on the 102 / 104 engines to get them to work / last

    Can you still buy the earlier bolts new from ktm ?

    want to find an engines weak points give it to quad racers for a season.....Stuff that works in two wheelers can often fail under quad use pretty quick..?

    I'd sooner work around studs than have to pull this engine again cause off failed shit...... Seen enough failed junk to last me a life time......
    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 !

  15. #14
    Senior Member KTMATVHQ Guru
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    Bob installation and removal of the top end with the studs installed is no problem in the quad chassis. Also there is no denying that the studs hold torque better and are far superior in quality to the factory bolts. Also no need to worry about installation or removal of the studs, ARP broaches a hex in the end so an allen wrench is all it takes to remove them.
    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

  16. #15
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    I cant remember the last time I worked on a engine that I just didnt pull first.

  17. #16
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    My head has timeserts in it so I can use 8mm arp bolts instead of the 6mm stocks ones I can crank them things down
    Last edited by flooringit; 11-22-2012 at 05:27 PM.
    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

  18. #17
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    Cool studs it is for you hp guys. Tested and it works is the correct answer. You will probably get the new bolts if the number has been super ceded but they are inexpensive

  19. #18
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    Quote Originally Posted by flooringit View Post
    My head has timeserts in it so I can use 8mm arp bolts instead of the 6mm stocks ones I can crank them things down
    I am assuming not threaded just where the bolt goes through the head? Good idea.

  20. #19
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    Where you bolt up from cylinder to head. The 3small bolts
    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

  21. #20
    Administrator KTMATVHQ Guru
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    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
    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 !


 
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