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Makotosun

AT1 (probably CT1 also) shock absorber length/replacements?

  • nhsteve
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Gearing up for the next project in the queue, a 1970 AT1. The shocks are really knackered and rusty. They just cannot be worth the powder coat (let alone re-chroming) cost. So in casting about for replacements I was wondering what others might have used? This isn't to be an 'expenses be damned' project.

They measure just at 12", or about 305mm. I see some aftermarket ones measuring 320mm or about 12.6", so close. And I see some 13" ones at a reasonable cost as well (about $100 + $16 shipping)

Thoughts?

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16 Mar 2023 07:57 #1

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Does the extra room leave more “cushion”? If it didn’t look way out of place, I’d be tempted to give it a try and see… you can always keep an eye out for direct replacements in the mean time..
Sneezles61
16 Mar 2023 09:03 #2

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I have used the $100 specials on three bikes, soon to be a fourth. I buy the Assault or Redwing shocks that often show up on eBay. I have found them at 12.5 and 13 inch lengths. I don’t do any aggressive off-road riding, so they work fine for my needs. But they obviously aren’t stock appearance when I use them to replace the thermo-flow style shocks on my 1975 models.
 
 
Schu

CT1B, CT1C, JT1, JT2, DT360A, GT80B, DT100B, DT125B,
DT175B, DT175C, DT250B, DT400B, Z50, SCR950

Someday, you'll own some Yamahas
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16 Mar 2023 13:51 #3

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I put one inch longer on my CT1C looks and rides great they look just right to me I’ve got a AT2 I’ll measure my AT to let you know what I found 
16 Mar 2023 15:08 #4

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Yes my AT2 is 12” my CT1C is now close to 13”
16 Mar 2023 17:00 #5

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  • nhsteve
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Thank you guys! Those Assault shocks were actually the ones I was looking at. OEMs on the bike are 12", the Assaults are 13", and I was concerned about the added one inch. Appreciate posting up the photos also, as I can see I should not be concerned. Just an extra bit of travel to haul my big a** around! 

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Cheers!  

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18 Mar 2023 08:07 #6

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One thing to consider when using longer shocks , is that the swinging arm is pushed down more .
Depending on the size of your rear sprocket , the top run of your chain may wind up touching your
swinging arm . Obviously , with a large rear sprocket , there will be more clearance , than with a small one .
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18 Mar 2023 16:45 #7

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A good point Swoop and one I re-discovered when I mounted up some new Progressive shocks on #1 son's first bike, a '73 RD250. The extra length pushed things much closer to the muffler as things worked out. Only touched when on the centerstand, though.
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23 Mar 2023 08:03 #8

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