Terra was a GP sponsor. The Terra bikes were the SP's of the MkII MC18 and had the adjustable front and rear suspension as well as a dry clutch and the mag wheels.

There were other small differences but these where only in fairing pannel design.

Its all OE Terra body work Paul, the only one I couldnt get/find was the lower left pannel so Wayne (nsr-wayne) painted that white for me and I got most of the stickers I needed for it though Honda.
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If I have to take the carbs off once more...