Hello Andy, and welcome.

The TYGA 300 kit can be used with any NSR250 bottom-end. All the top-ends are interchangeable. (You'll soon learn the NSR250 is a far superior and friendly design than any other 250 2-stroke!)

TYGA made a GP style MC18 race seat. I'm not sure if they still do, but they are out there. Put a "wanted" in Classifieds, and try e-mailing TYGA. Their race seat fitted the stock subframe.
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Andy.
NSR-WORLD.COM

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