ATK history

[paul]

http://www.bikepoint.com.au/all-bikes/private/details.aspx?Cr=0&R=3148852&keywords=&trecs=1&__Ns=p_RankSort_Int32|1||p_Make_String|0||p_Model_String|0||p_YearMade_Int32|1||p_PriceSort_Decimal|1&__sid=12700DC416BB&__Nne=15&__Qpb=true&seot=1&__N=1432 604 1430 1429 1428 4294964316&silo=1400

[paul]

http://www.americandirtbike.com/newpage1.htm

[paul]

some off those look realy cool .i might hunt one down my self . the plastics look yamahaish on some models

[cyclegod]

some off those look realy cool .i might hunt one down my self . the plastics look yamahaish on some models

Early ones used a TT600 tank and seat, and some models used yammie fenders too

[Marc.com]

Goldfields Motorcycles used to peddle them back in the day. I had 89 406 for a while, was cutting edge except for the motor which had the power characteristics of a farm tractor.  The only problem it had was a KTM 350 would wipe the floor with it. Final 250 I saw sat around for a while, was sold to Robbie Twyerold for $800 and he got it going really fast which given his background in air colled Yamaha motors and riding ability is not surprising.

[TT]

Yeah, thanks fellas. I obviously got confused between the Boyesen Link and Horst's little project.......... too much red wine under the bridge I reckon..........  

[LWC82PE]

Tanks i do not think are TT600, all the ones ive seen looking quite a bit different but I can see similarities. Maybe someone can prove me wrong though.


Here is an article I just scanned.

It was scanned an uploaded as larger images but i think this forum automatically re-sizes the images. I think you can still just read the article but if anyone needs a larger copy you will have to email me.

[evo550]

The tank and seat from the first 560's are yz 490 K/L units.
I have never seen a twin shock version, the pic Firko posted was the first production version, I have an article of a pre production version, but it was still a single, linkless shock.
Not sure why Walter got upset and locked the listing.

[Tim754]

 ATK Yep one shocker and mounted on one side of the swing arm. Who needs intricate fiddly bloody shitfull linkages!!! Brilliant!!! Sorry about the chain tensioner system and the disk brake rotor on the counter shaft...........

[LWC82PE]

what would the tank in my article be? The cap looks like Acerbis to me, but its a bit hard to tell with out seeing any closer. I can see the front fender is Acerbis and probably the rear too. I wonder what plastics Mainland and Richter products made for the bike?

[GMC]

Drakie had one of the 250 2 strokes, must have been around late eighties?
I did some work on it for him as the pipe was touching on the plastics, the tank i think, so I had to tweak it a bit for some clearance.
He had me weld a few nuts on behind tabs for the guards etc. as everything was nuts & bolts which can be a bit a pain when working on them.
Think I tweaked a few other bits as well but can't remember now

Seemed to me that their must have been huge forces on the top idler sprocket of the chain system when under acceleration.

Didn't like the fact that the hose to the brake resevoir sat inbetween fins.

I noticed it had a few KTM parts on it. Muffler hanger bracket for one, as KTM was cast into it.


Overall I thought it wasn't a bad thing for something that sat outside the square.
I would have liked one of the 400's, interesting to read the 400 wasn't that good a motor.

[motomaniac]

Hey Geoff did you ever go to see Horst at his factory in 85. Some of us did but I cant remember who.

[GMC]

Can't remember visiting ATK, some of the memories are getting a bit vague though.
Seemed to do so much in those 2 months.
I think you & Trunky did a few different things to the rest of us, which is why I can't find any photo's of you from back then.
Do remember visiting DMC & Pro Circuit among others.
Remember seeing metre square boxes of pipe stampings at Pro Circuit that guys were welding together.

You have reminded me though I have a picture of an ATK in the pits at the Hangtown National.
I will have to dig it out for a closer look, I think it was a 4 stroke.

Think there was something about it too. They had to remove the counter shaft brake as the US rules said it had to have a rear brake which was interpreted that the brake had to be on the back wheel.

[holeshot buddy]

i had a 96 atk 605 there are some pictures on the other website
they used ktm plastics
very trick bikes c&j frame  billet triples and brake lever
talon hubs excel rims white power front and rear
nissan brakes answer taper bars magura etc etc all standard
the motors are unreal chrome bore roller cam and rockers
the top end weighs nothing huge dellorto carb
they get 90hp out of them in the us  for flatrack
and you could get fuel injection as well back then
and the japs are only just doing it now

nice bikes wish i kept mine :'(

[Mick D]

WHOO-UP there Boys, WHOO-UP
         Being a VMX site I would consider the best ATK would be the best pre-85 one. So lets not forget the best open class pre-85 ATK thumper ever made!

       
                  ATK-XR500