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Makotosun

DT1 and RT1 Competition Fork Damper kit

  • mpercy
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hello, has anyone installed one of the fork damper kits made back in the day by Circle Industries or Fun N Fast's for a 1971 DT1 250 or RT1 360? Do they make much difference?

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13 Apr 2026 14:13 #1

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Replied by RT325 on topic DT1 and RT1 Competition Fork Damper kit

Looks like you lose travel if that spring goes as it is now. Or is it a spring to replace the spacer on top of the springs so maybe it's a longer damper & spring is added to stop the main original with spacer from coil binding on longer travel. Any more info on it?. Is this for the alloy slider forks not the first model steel sliders like i have on mine.
Just to explain my first sentence--PE & RM Suzuki's had a long preloading topping out spring but that's talking long travel towards 1980 so i guess not relevant.
Last edit: 14 Apr 2026 15:11 by RT325.
14 Apr 2026 15:08 #2

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Replied by Mark350 on topic DT1 and RT1 Competition Fork Damper kit

I kinda remember these from the day, think they had different valving and the springs replaced the stock upper spacer. I used the springs but did not replace the lower piston piece. The upper spring replacement did help with some additional travel.
14 Apr 2026 18:20 #3

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