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Dt250 piston rings

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I've got a dt250 piston for my ty! New rings arrived, in box with rings is a thin 50pence shaped ring! Can anyone tell me where it goes?

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Could be a supply error, sounds like you have received 4-stroke piston rings (XT 250) and the expander(50 pence shape-ish) ring is supposed to go behind oil control ring. I could well be wrong 😳. GDT and TY OE rings must butt up against the ring locator pegs in the grooves. 

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Its an expander ring, pretty common in 2 strokes, especially yamaha. Most people leave them out, however if you want to fit it it goes behind the lower ring

Edited by faussy
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The rings that came with my TY piston are the same, goes behind the lower ring to help give more sealing pressure

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I installed new rings last night, with expansion ring under lower ring. Give her a run tonight 👍🏻

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