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

... more »
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

... more »
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.

... more »
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

... more »
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

... more »
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.

... more »
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 »

Added reply in a thread 1989 ATK 406 Restoration 3/7/2020 10:13 PM

Finally got the skidplate done.

Added reply in a thread 1989 ATK 406 Restoration 2/27/2020 8:06 PM

I made some spacers and tried to use alumiweld rods to weld them to the skid plate. Unfortunately I was having no luck so I had to bust out the spool gun. This is my second time ever using it and it went about as I expected. It welds, but with a typical

... more »
Added reply in a thread 1989 ATK 406 Restoration 2/24/2020 9:55 AM

Got my $30 sheet of aluminum and trimmed it out yesterday. Its 3/16 thick and as you can see, won't be enough on its own to clear the peg mounts. I'll have to do a little spacing and also go back and trim the peg mounts a little more, but I'm getting

... more »
Added reply in a thread 1989 ATK 406 Restoration 2/17/2020 5:47 PM

Not my finest work, but it will get another white number plate decal and its good enough for a rider.

Added reply in a thread 1989 ATK 406 Restoration 2/17/2020 10:47 AM

Started working on the number plates. The fossilized decals protected the surface so they will just needed superficial sanding. Here is one of them after a little razor blading to clean up the scuffs and 800 grit. Ill post some finish sanding and polishing

... more »
Added reply in a thread 1989 ATK 406 Restoration 2/16/2020 4:41 PM

Working on a skid plate. I ordered a sheet of 18x10 3/16 aluminum. Here is the cardboard template for it

I also shaved about 3/8 inch off of the bottom of the footpeg mounts. I'm going to use a 1/8 inch strap of aluminum to space my skid plate ... more »
Added reply in a thread 1989 ATK 406 Restoration 2/13/2020 2:57 PM

Slow progress, but here is an update:

Added reply in a thread 1989 ATK 406 Restoration 2/3/2020 7:36 AM

Yeah, I must be a foot peg diva now in my old age because I considered the stock stuff unridable.

smile
I haven't done a final measure yet, but I think they are going to be almost 1 inch lower. I'm going to have to come up with a skid plate now because ... more »
Added reply in a thread 1989 ATK 406 Restoration 2/2/2020 10:35 AM

Nice shots K0. Im digging the jersey! I got the footpegs pretty much finished. They turned out about as good as I was hoping for. I've just got to fit some hardware and grind out a bit of the weld to make sure the allen head bolts fit.

... more »