Ahh thats where I was mistaken, and you are wrong. After getting hold of a haynes manual for the MTX-50 and checking some measurements it seems that I have an MTX-50 with a big bore piston and barrel.
And this gives me, wait for it, 60 whole cc
It looks like its going to cost me £20 for a new piston, rings, small end and another £20 for a gasket set.
I've got no intention of using this thing on the road as I'll look a massive tit riding around on a hairdryer, but it might get a bit of a blat across some fields before I bung it up on ebay or the like.
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