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DT 2 piston kit

  • Green53
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DT 2 piston kit was created by Green53

Hi everyone, I am ready to assemble a fresh top end and purchased a genuine yamaha 1mm over piston kit. It came with thin flat wire "rings" as well as the 2 standard rings that I'm accustomed to using. Do these thin ones, with multiple small bends, go under the regular style rings? The repair manual doesn't mention them. Thanks.
17 Sep 2026 14:57 #1

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  • Green53
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Replied by Green53 on topic DT 2 piston kit

I looked at a few ebay listings, it shows the ring expanders:   
It seems they are for less ring noise and better ring sealing.
Some advise against using them due to failure.
I don't see them on the exploded diagram and they are not mentioned in the repair manual.
17 Sep 2026 17:56 #2

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