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Eccentric

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About Eccentric

  • Rank
    TT Member

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  • Gender
    Male
  • Location
    California
  • Interests
    Old IHC Trucks and Engines, Chainsaws, and Motorcycles...

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187 profile views
  1. Eccentric

    XR 650R disappointed

    Awesome!
  2. Eccentric

    XR 650R disappointed

    So how'd it go with your BRP?
  3. Eccentric

    Is Honda making a 2020 CR500?

  4. Eccentric

    Is Honda making a 2020 CR500?

    Now that dude can ride.....
  5. Eccentric

    Is Honda making a 2020 CR500?

    Yes please. 2020 XR650RL, with e-start, backup kickstarter, modern suspension, W/R six speed, cush drive rear hub, same seat height as the original 650R, MSRP of $10,000 USD or less, and street legal in all 50 states. Now that's a pipe dream....
  6. Eccentric

    Is Honda making a 2020 CR500?

    Now stop that! Yer making my loins feel funny...
  7. Eccentric

    Reviving an atk 406 mx 2 stroke from abandoned

    Yep. IIRC, the front wheel/hub/brake are KTM parts. Possibly the forks and tripple clamps. Been too many years for me to remember for sure. Somewhere........I have the Dirt Bike magazine review of the 1990 406 packed away in a box of 'vintage' magazines I kept from my youth....
  8. Eccentric

    Reviving an atk 406 mx 2 stroke from abandoned

    Ehh.... Yes and no. They often remained on the sales floor for extended periods collecting dust. Much of the low-sales problem with the ATK's was due to a sparse dealer network.............and high prices. They were a 'high end boutique brand'. This was all long before the internet/eBay. Only source for parts were the few dealers scattered throughout the country. They also were 'odd/unusual/not like the Japanese bikes'. Left hand kick (which I still am more comfortable with, as the majority of my bikes including the 1983 CR250R were LH kick), air cooling, expensive parts, non-Japanese frame geometry, etc. The European bikes (including KTM) still suffered from low US sales at this point for many of the same reasons. Many younger riders probably don't even know that KTM wasn't always orange............and that Husky wasn't always owned by KTM (and using the same engines as the KTM's). The reasons for low sales of these machines (especially the higher sticker prices) aren't really a detriment to what the OP was looking to do with the bike. ATK never sold many of the 250/406 air cooled 2-strokes. Most of their sales at this time were from the Rotax 4-stroke powered machines. Those were some of the first 4-strokes to be relatively light and powerful.............AND to be available with the magic button. Everything Japanese (2T anyway) and most Euro bikes were liquid cooled at this point. Low sales numbers (no help from the economy of scale), the higher cost of US labor, and the cost of 'premium' components (Magura controls, WP suspension, Answer bars, and even nickle plated frames for a few years like my 1990 406) all raised the sticker prices for their bikes. Towards the end of ATK, the Rotax 4T powered models remained, while the air cooled 2T bikes were replaced by 250/260cc liquid cooled Rotax powered models. I don't see anything in the OP's posts that indicate that he was looking to use this bike as competition for a modern Japanese or Euro machine. As a low investment bike to have some fun on, it'd be fine. He obviously has the mechanical skills and the inclination to deal with the minor quirks that this bike has. Yes he could sell it and buy something like a used Suzuki DRZ400 with electric starting and other 'modern' luxuries.
  9. Eccentric

    Reviving an atk 406 mx 2 stroke from abandoned

    Worked fine for me. A little grabby. That little disk has the advantage of gearing (for torque multiplication) as it's on the countershaft. Supposedly, they had a habit of overheating and fading (which comes from the disadvantage of speed multiplication as it's on the countershaft). That'd be more of an issue in high speed/heat desert riding. The last couple years of these bikes had conventional rear brakes (without the ATK constant chain setup).
  10. Eccentric

    Reviving an atk 406 mx 2 stroke from abandoned

    That looks like the Mikuni that originally was on my 1990 406. With the float bowl off and the floats removed, you'd be able to see if it has a pilot circuit or not. The main jet is in the center of the bottom of the carb body. The pilot jet is smaller and offset from the main. Both are brass. Main has a hex head, while the pilot has a slotted head. If it has a pilot circuit, I'd use it. If it doesn't...........I'd replace it with a Keihin PJ or PWK carb. The Mikuni TM38 in this pic has a pilot circuit. The pilot jet itself is missing. It belongs in the threaded hole offset towards us from the main jet. The non pilot circuit TM's don't have that threaded hole. That pressed-in brass tube near the airbox spigot end of the carb body leads to the air screw. Both the pilot and non-pilot TM's have this. This TM38 carb body is of the non-pilot type. It is also missing the main jet in this pic (it would go in the threadded hole in the center). I have no experience with the chinese PWK copies on eBay (many of which are dishonestly labeled as 'genuine' Keihin carbs from Sudco). This is a pic of real Keihin PJ series carb like I used on my 406. They were on many Honda motorcross bikes and all TRX250R quads. Here's some eBay listings. Some are listings for used, genuine Keihin PJ series carbs. Most are listings for new chinese copies of Keihin PWK carbs. The PWK is an evolution of the PJ. https://www.ebay.com/sch/i.html?_nkw=cr500+carburetor
  11. Eccentric

    Reviving an atk 406 mx 2 stroke from abandoned

    Definitely worth it. Once I got the carb situation sorted she was a sweetheart. Not exhausting to ride at all. Weighed slightly more than a 250 class machine, with a poopload more grunt (yet not so violent that it wears ya out like a 500 class 2stroke). Similar to a KTM 360/380 or one of the Noleen 360 kit equipped Yamaha YZ/WR 250's. I wish I still had mine. The Cross Country variant with the 6 speed and larger gas tank are pretty scarce. Finances got tough not long after I squared it away, so the ATK and my quad had to be sold. I only took it on a dozen or so more rides after I had it set up the way I wanted it. Off it went to pay for non-fun stuff (as the millennials say........."adulting sucks" sometimes). You may not even have to change out the carb. I can't quite see which carb is on your bike in the pics. Canya shoot a couple closeups of the carburetor? You may already have a Keihin PJ, or possibly a Mikuni with a pilot circuit. Those pilotless Mikuni flat slides weren't made very long (thankfully).
  12. Eccentric

    Reviving an atk 406 mx 2 stroke from abandoned

    Yep. First full sized dirt bike I owned was a 1981 IT125. Just about the polar opposite of these 406's. I know whatcha mean about being wiped out during/after a tough race on a 406. I raced my ATK in the Hollister Hair Scramble years ago. Hadn't swapped the Keihin PJ38 in place of the flat slide Mikuni at that point. Damn thing stalled on me a few times while going down some switchbacks on a a very steep and slippery sidehill. Without a pilot circuit, it stalled if I even thought about touching the rear brake at low RPM. Third or fourth stall locked the rear wheel before I could grab the clutch. Put me down hard and buggered my knee. By the time I'd dragged the bike back to the trail and got 'er lit again..............................I was f'n DONE. Finished the lap and pulled off to wrap and ice my knee. Still bugs me when the weather changes. The Keihin swap that I'd been putting off suddenly became far more important.....
  13. Eccentric

    Reviving an atk 406 mx 2 stroke from abandoned

    That's a personal thing. The vintage/evo/retro dirt bike thing is really taking off. Don't know enough about that MX racing scene to know if your bike is eligible or desirable for any classes as it has upside-down forks and F/R disc brakes. I'm not crazy about the decals (they were all absent from my bike when I got it).
  14. Eccentric

    Reviving an atk 406 mx 2 stroke from abandoned

    Just the usual freshening up of an older bike. New brake fluid. Go through the wheel bearings and headset bearings. EBC probably still catalogs brake pads for these. I imagine that the forks and shock could use a rebuild. They're standard WP pieces from the period. Any good suspension shop could rebuild 'em with new seals and fluid, and if needed could respring/revalve things for your weight.
  15. Eccentric

    Reviving an atk 406 mx 2 stroke from abandoned

    Yessir. Mine was able to keep up with a CR500 on a loose uphill, yet was still very responsive and controlable on tight, slow trails. Top speed was pretty good with the 6 speed trans too. I'd heard/read that the 6 speed was fragile (compared to the 5 speed), but I never had problems with mine. IIRC, CanAm had a 500 class version of the 5 speed engine in an early '80s MX bike. I'd forgotten the stiff clutch pull. I replaced the lever assy with an aftermarket one with multiple cable barrel holes for leverage ratio choices. Helped.
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