Added reply in a thread 1989 ATK 406 Restoration 4/12/2020 5:38 PM

Thats awesome bonseff! They were really dwelling on the ATK at 2:51. Also cool to see some banners around the track.

Added reply in a thread 1989 ATK 406 Restoration 4/12/2020 7:03 AM

I actually found the problem last night. The wheel was a little tight to fit before but now it slips right in. I also found out that my A-Trak components are all jacked up. It appears there was a chain detrailment that caught up inside the upper. It ... more »

Added reply in a thread 1989 ATK 406 Restoration 4/10/2020 9:41 PM

And 4 hours later on some of the cheapest equipment that Harbor Freight has to offer, I've got a rotor that can be described as "Not as bad as it could have been." In all honestly I think it turned out pretty good and seems to fit the look of the bike

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Added reply in a thread 1989 ATK 406 Restoration 4/10/2020 11:01 AM

I hate to spend this much time on something that is purely cosmetic, but I really can't stand this solid disc.

Added reply in a thread 1989 ATK 406 Restoration 4/9/2020 8:24 PM

Got the engine cleaned up. I decided to touch up the black engine paint afterall. New bearings in the swinger, fighting with the axle nut and making a spacer for the countershaft sprocket. I need to get the A-Trak componets and chain back on before doing

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Added reply in a thread 1989 ATK 406 Restoration 4/5/2020 7:25 PM

Started cleaning the engine. There are some huge chunks of black powdercoat missing from the cases. I'm not even sure if I'll waste my time touching them up.

Also busted out the "classic" 2002 YZ250F that I did a really detailed build on. It ... more »
Added reply in a thread 1989 ATK 406 Restoration 4/4/2020 7:06 PM

Yeah Im keeping it. I hope to ride it, but thats what I said about the CR500R too and so far I just boot around the yard on it.

Added reply in a thread 1989 ATK 406 Restoration 4/3/2020 7:52 PM

Thinking of cross drilling the rear brake rotor. Basically to just make it look cooler.

Also got the badge reattached to the frame. The blue looks pretty cool from the red frame. ... more »
Added reply in a thread 1989 ATK 406 Restoration 4/1/2020 5:11 PM

Got the frame, swinger and shock spring back from the powdercoater. It looks so much better than the blue IMO.

Added reply in a thread 1989 ATK 406 Restoration 3/31/2020 8:07 PM

Took it apart again. Talked to Kelvin at Cycle Shed Racing and found out I had a snap ring in the wrong position. Once I moved it, everything was much happier. Shes all charged up again, no leaks, and ready for action. The dust cap gets torqued to 35-45

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Added reply in a thread 1989 ATK 406 Restoration 3/29/2020 7:52 PM

Boy it sure would be nice to have a manual. Or some torque specs. Or some pointers. But all I've got is a 45 minute conversation with a guy who gave me a quick rundown of this shock. Needless to say, I spent most of the day fussing with this thing, going

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Added reply in a thread 1989 ATK 406 Restoration 3/28/2020 8:34 PM

I got it together and I'm stumped. It would appear that the oil seal does not seal until under pressure. So you cant really adjust fluid. You add fluid, screw the end cap into place (with loctite?), air it up to 200 psi and your seal head pushes up against ... more »

Added reply in a thread 1989 ATK 406 Restoration 3/28/2020 4:48 PM

Pulling the DU bushing and oil seal from this end cap was a little complicated. I was able to snake a bearing puller in from the outside...just past the dust seal, spread it out to grab onto the bushing, then put it all under tension via the c-clamp.

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Added reply in a thread 1989 ATK 406 Restoration 3/24/2020 12:38 PM

I took your advice and pulled the compression valve. I was hesitant since Kelvin made it sound like it could be a can of worms, but I didnt see anything too difficult. I'll remove this to pull any excess fluid after the rebuild...and use it to help bleed

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Added reply in a thread 1989 ATK 406 Restoration 3/23/2020 9:12 PM

I always welcome your comments so no worries on too much advice. I was thinking the same thing about the shock body. I ran into an issue trying to grip the housing though. I finally came up with something...an old early 90's YZ triple clamp was close

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Added reply in a thread Thin shock oil recommendation 3/23/2020 8:51 PM

Gotcha. Welp, now I guess I get to decide between the Maxima 3wt shock oil that i pretty much use in everything vs. the golden spectro ultra light. Any idea how the two compare? I was told that these old WP's like super thin stuff (like brake cleaner ... more »

Added reply in a thread Thin shock oil recommendation 3/23/2020 9:44 AM

Golden Spectro cartridge fork fluid 125/150? I noticed they also sell an "ultra light" shock fluid but no idea on weight.

Added reply in a thread 1989 ATK 406 Restoration 3/22/2020 3:40 PM

I took the frame (red), swingarm (white) and shock spring (blue) in to the powdercoater last week. I'm looking forward to getting that stuff back so I can start to reassemble some items. I started on the shock rebuild too. This is a WP 4681 Super-Adjuster.

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Started new thread Thin shock oil recommendation 3/22/2020 8:27 AM

I was recommended Motorex sd1 for a mid 80's WP shock. It seems to only come in 5L jugs though. Rather than spend $75 on oil, can someone recommend a very thin similar oil that I can buy in a smaller bottle?

This forum thread has 9 replies

Added reply in a thread 1989 ATK 406 Restoration 3/9/2020 4:38 AM

Man your skid plates look sweet! I only really did this because my peg mounts were so low. For now I'll resist doing wings but if I get into trouble I may need to add some sections. Oh, as for the mounts, I welded the steel lugs to the frame for a nice ... more »