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The mss shock was designed using an original 2006 TW200 rear shock and spring for the dimensions and spring strength. The Tdub shock has a bump stop. That was included 8n the design. It has proper fluid added for it to bottom out from 1 1/2" to 2" from the frame. Don't know what the overall travel is. Will take some measurements.
 

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So, I went down to the hot garage and took the 2006 bike with an oem rear shock and compared the compression/springiness when just sitting on the bike and then compressing it while sitting. The difference is liek I said. It has more initial compression/springiness from not sitting to fully seated. Then it starts to stiffen and the compression feels better wit the MSS shock than the oem shock. Hard to explain. It seems it will not be so jarring when sitting and riding, but will perform very well either way sitting or standing on the pegs. BTW, the seat height is at about 32" level no weight. Lowers about 1 1/2" when sitting on it full weight. Will lower a bit more with the trail bag with about 15lbs on the back rack.
 

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I took the bike out this morning and ran it on some dirt roads to test the new MSS shock set at 360 psi of nitrogen. The shock is the same length as an oem Yamaha shock. I already broke in the shock a while back, so just needed to adjust the amount of nitrogen. It has no rebound static test and just a bit of rebound 25 lbs on the rear rack. Can now easily go 40 to 50 mph on dirt and gravel roads with small potholes. Am very pleased with the performance so far. Taking it out on some real trails will get a better picture of it's true potential.
 

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Update on the Marvin Shaw Shock.

Finally had time to work on the MSS shock project. 360 lbs of nitrogen ended up being still too soft. We bumped it up to 450 lbs and also moved the fill nipple to the side of the shock. It was on the upper beveled part, but the rear fuel tank mount interfered with attaching the shrader valve. Much better now. Make sure spacers are used both on the upper and lower mounting ends. Very important to keep the shock in the proper position without much side play. This goes for any shock in general. Talking with Tim at MSS, he said it is also possible to install a heavier spring if needed and they can all be adjusted for preload.
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Was able to really put the shock through the paces on our Silver City ride last Friday. Just under 100 miles of serious off road testing. It performed flawlessly. Seems to be perfect for my weight with riding gear and the travel gear on the back of the bike. I'm very happy with the Marvin Shaw Shock conversion and believe it was the correct path to follow.
 

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2004 TW200, Jets 'n Shims, DGV2, Acerbis Guards, ProTaper KX, JNS LED BLK
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Update on the Marvin Shaw Shock.

Finally had time to work on the MSS shock project. 360 lbs of nitrogen ended up being still too soft. We bumped it up to 450 lbs and also moved the fill nipple to the side of the shock. It was on the upper beveled part, but the rear fuel tank mount interfered with attaching the shrader valve. Much better now. Make sure spacers are used both on the upper and lower mounting ends. Very important to keep the shock in the proper position without much side play. This goes for any shock in general. Talking with Tim at MSS, he said it is also possible to install a heavier spring if needed and they can all be adjusted for preload. View attachment 217364 View attachment 217365 View attachment 217366
Was able to really put the shock through the paces on our Silver City ride last Friday. Just under 100 miles of serious off road testing. It performed flawlessly. Seems to be perfect for my weight with riding gear and the travel gear on the back of the bike. I'm very happy with the Marvin Shaw Shock conversion and believe it was the correct path to follow.
Thanks for the input. Sorry to ask, but what's your weight... "#'s-ish." Will help with the data, for everyone to get a better sense of psi to weight ranges for the MSS. TIA.
 
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Keep Tim Becky and the entire Marvin Shaw Shocks crew in your thoughts and prayers. Tim is not feeling well and spending a little time in the hospital. We expect a full recovery just scary with the times we are in. Its covid related
 

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Discussion Starter · #88 ·
Keep Tim Becky and the entire Marvin Shaw Shocks crew in your thoughts and prayers. Tim is not feeling well and spending a little time in the hospital. We expect a full recovery just scary with the times we are in. Its covid related
Thanks for keeping us in the loop. Hope Tim has a speedy recovery.
 

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Update on Tim at Marvin Shaw Shocks.

Just got off the phone with Tim. He is now home after 2 weeks in the hospital and will continuing recovering there. He's feeling better but is still weak. Had quite a serious case.

He wants to give a big thanks to all on this forum for our support.

Will give more updates as they come up.
 

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More importantly, is Tim back on track? Hoping he & family are well.

Also curious about any updates on the TW rear shock project.
 
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Discussion Starter · #92 ·
Is this project back on track?
Yea I've ridden on mine enough to say they are ready for prime time. I just need to measure myself or have oldworlds input about spacer size so folks can order everything they need for the install once the shock is built.

I haven't inquired about Tim (hope he is doing well), but I know his son was building shocks when I had my second one built earlier this year.
 

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TWBigBlake; will this shock pick the rear of the bike up some? Say inch and a half to two inches? I'm thinking about this with a 3" extended swing arm, and having a stiffer spring with the larger lever of the swing arm would be nice.
 

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Discussion Starter · #94 ·
TWBigBlake; will this shock pick the rear of the bike up some? Say inch and a half to two inches? I'm thinking about this with a 3" extended swing arm, and having a stiffer spring with the larger lever of the swing arm would be nice.
The one I had made will raise the seat up about an inch, if that's what you are getting at. I could get some pictures to show you exactly where on the seat I measured (in line with the bottom shock bracket) but figure this is just a feeler inquiry.

If you want some more height, you could always ask for a custom length shock with another .5" - 1" length eye-to-eye, might have to do a little back and forth talking with Tim (or his son) to get it dialed in for the feel and stroke length, but I don't think it would be a problem at all if you're willing to be patient and take some measurements :)
 

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2013 TW200, 1972 ST90, 1980 XL250S, 2005 YZ250 AND CAN AM X3 XRS
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OK BigBlake you got me interested. I have the stiffest Procycle shock spring and fork springs available. So if I put the new emulators and get the MSS shock Banshee clone will that be a good setup weight 320 going down slowly. I ride mostly mountain single track and Fire roads in So Cal big bear area and a little in Mammoth. Thanks for any suggestions.
 

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Discussion Starter · #97 · (Edited)
OK BigBlake you got me interested. I have the stiffest Procycle shock spring and fork springs available. So if I put the new emulators and get the MSS shock Banshee clone will that be a good setup weight 320 going down slowly. I ride mostly mountain single track and Fire roads in So Cal big bear area and a little in Mammoth. Thanks for any suggestions.
Id say it was the best thing I could do to enjoy riding the bike at my heaviest, the bike still handles like a boss and feels awesome braking and hitting bumps... and as I go down in weight, I can just release pressure in the rear shock.

Still your decision, but it's a pretty damn nice upgrade.
 

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2013 TW200, 1972 ST90, 1980 XL250S, 2005 YZ250 AND CAN AM X3 XRS
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When I call The guys at MSS what do I need to ask them for and what info do they need? I bought the emulators this morning so I might as well get the shock. haha
 

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Discussion Starter · #99 ·
When I call The guys at MSS what do I need to ask them for and what info do they need? I bought the emulators this morning so I might as well get the shock. haha
If you want the banshee dimensions. Just ask them for a TW 200 shock built off of the banshee shock dimensions. One like Blake's. If it's Tim, he'll know what you're asking for.
 
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