The Compleat ATK thread

Discussion in 'Thumpers' started by Gummee!, Feb 8, 2009.

  1. Zecatfish

    Zecatfish XTique Rider

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    7,927
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    260LQ Wiseco Piston Kit # 701M06800 : 3 ounces lighter than stock: faster rev.
    250LQ Wiseco Piston Kit # 701M06750
    Wiseco Wrist Pin Bearing # B1003A
    Wiseco Top End Gasket Set # W5566
    Boysen Reed # 670
    Moto Tassinari V-Force 3 # V306A-M :I use the V-Force 2 (same as KTM 250 93-97)
    Paoli Blue Steel 46mm : Same as 2000 Honda XR650R Flanders Part number 401-90155
    Fork Seal Size: 46x58x10.5/11mm
    Rear Brake Rotor Shark fin: Deval for 99 KTM: Needs minor filing along top to clear swingarm.
    Rear sprockets same as RM 250
    Chain Guide shell: The stock is flimsy caused me to not finish race: Carbon Fiber Shell YZ250
    Paoli Fork bushings, Get Bushing kit for CR500
    Rear Brake Rotor is an ATK specific part. I suggest ordering one as a spare. ATK hasn't produced a new bike in a year or more.
    Front Rotor is the same as a 270mm KTM if I remember right.
    The shifter on the LQ's was custom made for ATK, theres no direct replacement. If you can find the one with the Grey rubber tip buy it. The black rubber tipped ones was CHEAP and easily destroyed.
    The factory has some white plastic in stock, or did have, for the KTM styled side panels, I know where to get the KTM style number panels and rear fender in black. :deal
    #41
  2. Gummee!

    Gummee! That's MR. Toothless

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    Them first pics in this thread are the one that's showing up tomorrow.

    :clap

    We're gonna see how tired the delivery boy is when he gets here. Not tired = Nimbus. Tired = Thunder Canyon. Regardless, there's bike and beer coming tomorrow nite! :clap

    M
    #42
  3. Gummee!

    Gummee! That's MR. Toothless

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    So, I've had the bike since Tues and haven't managed to get a ride on it yet. :bluduh Work(sucks) has been getting in the way. :nod

    WP suspension and not Paioli. :thumb
    Looks as good as the first pics in the thread. :thumb

    I got a headlight assy with it. Also got a pair of turn signals for the rear. Need a tail light assy and pressure switches for the brakes. Making it legal is job 1. After that, adding a starter. :nod I'm a bit short to get my leg up high enough to kick the beast over. :baldy Who has a few inches of leg they can donate?! :ear :D

    Normally, I don't work on Sunday. :nono There's a home show on and the leads are flying fast and furious. :nod Soooo no ride tomorrow either!

    Any of y'all in Tucson have a hitch mounted bike carrier they wanna lend me till I can get my own? :ear

    M
    #43
  4. Gummee!

    Gummee! That's MR. Toothless

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    Since I've been looking at Dennis Kirk... I'm even more :confused than I was before.

    WTF do I need to put brake switches on this thing so I can make er street legal?

    How bout a fender with a light assy on it?

    I'm guessing the answer is 'call Utah.'

    M
    #44
  5. Zecatfish

    Zecatfish XTique Rider

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    You need banjo bolt switches.
    No springs to hookup or worry about.
    Works off brake pressure.
    I used the same thing on my ATK 260 to get brake lights on it.
    #45
  6. Zecatfish

    Zecatfish XTique Rider

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  7. Zecatfish

    Zecatfish XTique Rider

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    IF your bike is not wired for lights already, the stator is pure A/C.
    You'll need a voltage regulator, and the lights use no ground.

    headlight===========stator==voltage regulator===========tail/brakelight

    I ran two wires from front to back, tied it to the headlight switch for hi/lo and the tail with a splice off it to the brakelight switches. The voltage regulator attaches to each wire as does the stator.
    If you try to ground it you'll kill the stator unless you run it through a rectifier to get DC and add a battery.
    The regulator doesn't have to be grounded either. Just just shunts the excess voltage across its self.
    Do it wrong you'll be buying more bulbs. Ask me how I know. :deal
    #47
  8. Donkey Hotey

    Donkey Hotey De Jo Momma

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    Look at any KTM LC4 for tips on this. The brake switches should all be the same (banjo-bolt switches as already mentioned). I also added a front brake switch on mine because I usually use the front brake and didn't want to grab a handful and get rear ended. :eek1

    As for the tail light: if you order through ATK, you're going to have to order their under-fender brace (an aluminum contraption that gives some strength to the plastic). Your other choices are Acerbis or UFO tail light assemblies. I had the UFO on my first ATK. The turn signal melted on the way home. :bluduh If you have a decent deflector on the Supertrap, you'll get away with it, otherwise, forget it.

    Acerbis also sells a tail light, license plate mount. None of them are perfect solutions. Again, I made my own tail light mount for mine. It's far from ideal as well.
    #48
  9. gaspipe

    gaspipe Wandering Soul Super Moderator

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    Looks like you're gonna have some fun, Mike.

    #49
  10. Gummee!

    Gummee! That's MR. Toothless

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    Got her started on my own for the first time today. :clap Hadta go to an appointment, so didn't get a chance to ride it. :bluduh

    Soon,

    M
    #50
  11. Gummee!

    Gummee! That's MR. Toothless

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    I saw Stick Me off to work(sucks) and actually got the ATK started. Took a bit o' doing since this is the second time I've hadta kick this bike into life. :nod :hotandsweatyafterkickingfor10min Rode right past a cop on the way out to the little patch of desert. Not even a wave. :nah

    So what IS the ticket for riding a dirt-only bike on the streets? :ear

    I managed to get to a gate with a 'no motorized vehicle' sign, so I hopped into a housing dev. and went around that section. :patch

    Kept looking behind me for Johnny Law. Luckily, I didn't see him! Also luckily, there's a little trail of sorts next to the roads out here.

    As I was riding down the bicycle lane hoping and praying for that section of dirt to start, I noticed it was getting a wee bit on the dark side.

    Hmmm maybe I should turn back now?

    Nah :nah I'll keep going on a short loop.

    Y'know, its MUCH easier to see whatcher doin in daylight. :nod

    I managed to get home with only one slight mishap with a curb. Hope I didn't ding my rim! No, I haven't looked.

    Observations: its MUCH easier to ride this bike in the dirt than the GS

    This seat is HARD

    Its MUCH easier to ride when you can see

    Did I mention the seat's hard?

    Sand's not as big an issue on a lighter bike. GS = :eek1

    Woulda been nice to be able to see

    M
    #51
  12. atkxr600

    atkxr600 n00b

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    Just sold mine, after 20 years of ownership
    [​IMG]
    #52
  13. Gummee!

    Gummee! That's MR. Toothless

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    You shoved a Honda engine in there?

    How?

    Why?

    M
    #53
  14. Donkey Hotey

    Donkey Hotey De Jo Momma

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    With bolts.

    Because the instructions said so.

    Because ATK's first motorcycle was actually a frame kit for the XL/XR600. You supplied an engine, maybe the wheels and maybe the forks, though they usually ended up with KTM parts.

    That is the best one I've recently seen. Where are you? Was this the one that was on eBay? Midwest? I wouldn't mind having one of those someday. That was Horst Leitner's first complete creation.

    Gummee: technically speaking, the ATK you/I have isn't a real (Leitner) ATK. The last real ATKs were pre-1994. The easiest way to spot a Horst Leitner ATK is the rear disk brake being on the engine. Lots of innovation on those early bikes. I think his best creation was the 406. I need to get me one of those. :evil

    Photos & history here:
    http://www.americandirtbike.com/newpage1.htm
    #54
  15. Gummee!

    Gummee! That's MR. Toothless

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    I had a buddy that rode the wheels off some AMP bicycles 'back when.' I don't remember how many frames he broke. Horst never did like that. :nah After a while, he stopped sending new ones.

    Some of what Horst thunk up: the link that Specialized still uses, etc. are way nifty. :nod The disc on the engine? :dunno

    M
    #55
  16. atkxr600

    atkxr600 n00b

    Joined:
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    Yes, that was mine on eBay. I'm in Flint Mich. winning bidder drove up from Cleveland Ohio. Bike went off at $2,376.00. I thought, I would be lucky to get 1750. I was really just hoping to cover the $1,200.00 in receipts I had from the last rebuild. Thanks for the kind words.

    As to the how, it was a kit that ATK offered back in the day. The kit used the engine, forks, wheels and brakes from your own XR, then the frame, swingarm, rear shock,and body work from ATK. You could actually have bought one from ATK with the Honda mill in it. Motocross Action did a write up in 87, gave it rave reviews.

    Now for the why, in the late 1980's, I was racing Hare Scrambles, in AMA District 14, I was racing my 1986 XR600R. It was heavy and I was looking to put it on a diet. A hard get off, had sent the XR on a long series of endos, that resulted in a bent rear frame section. The frame was straitened, and the bike was ridable, but it was always in the back of my mind.
    I always wanted an ATK, but was never a fan of the Rotax. I absolutely hated the left hand kick start, I had a 1976 Husky CR250 and never liked the LH kick. Add to that the fact that I seem to fall allot, and getting a big thumper, to clear and fire, after a fall, is hard enough, without finding suitable footing on the side of the bike (where you won't get run over by the guys passing you). You guys without E start, know what I'm talking about, the Rotax of the day had you looking through a peep hole on the side of the rocker box, to see a small white mrk come up, to find TDC, then try and just pass that, and kick the hell out of it. If it doesn't fire do it all over again, in a 29" wide trail, through the trees, with every hotshoe blowing past you.
    Anyways, the kit allowed me to keep my trusty XR6 motor, and lose weight too.
    I built it 1989, rebuilt in 2005. During the rebuild my wife bought me a 2006 CRF450R, after riding that I knew I would never spend much time on the 600 again. I let it sit in the back of the garage, for a few years, then just started cleaning out the garage. Just too much stuff sitting around. I know I'll miss it, but thats life.
    [​IMG]
    #56
  17. atkxr600

    atkxr600 n00b

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    Oh, and the sad, or ironic part is, the guy that bought it, has know idea what he got. He was just looking for a nice XR600.:norton:norton:norton
    #57
  18. Gummee!

    Gummee! That's MR. Toothless

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    I had a pretty good idea what I was getting when I spoke with 'the dood from UT.' :nod

    I'd been shopping for a road legal dirt bike a while back and ran across an ATK on Sandy Eggo's CL. Got talked out of that and into a 640Adv. I SHOULD have been talked into something like a 250, but... :norton Had my mind made up.

    So far, so good on the riding... Gotta figger this kicking thing out. :nod 10min of kicking SUCKS! Don't have the $$ for a lectric leg kit just yet. :cry Anyone know any flattrackers?

    M
    #58
  19. Chilipepper

    Chilipepper Baja wannabe

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    I sold my 1993 406 last year. I gave up trying to licence it for the road so I wouldn't have to trailer it out to the riding areas. Somebody up in the interior of BC has his licenced though and it looks sweet. I loved that machine! I'm not sure who it was built for though. I'm like 6'5" and it's a tall bike, I think you could just about squeeze a honda civic under the skid plate. The height of that thing made going over logs idiot proof. It was bloody fast too but oh so friggin loud!

    -Gummee! the rear brake was a very tiny disc brake on the same shaft as the counter sprocket. As small as it was it worked very well and cut down on the unsprung weight at the rear wheel and was nearly impossible to damage where it was.

    And since you're having a hard time kicking yours, mine kicked over easier when I tipped it over until gas came out the overflow on the carb, then stand it up and it went in the first 3 kicks everytime. YMMV
    #59
  20. Gummee!

    Gummee! That's MR. Toothless

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    I think its more technique than anything.

    Maybe jetting too? :dunno I'm NOT an expert on carbs by any stretch of the imagination. :nono

    M
    #60