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Geo, if you're looking for sprockets, try Talon Engineering - they do all sorts of different sizes for all sorts of different bikes 8-)

It's only a stinkwheel, dead easy to drain the coolant and whip the head and barrel off to see if there's any evidence of seizure on piston and barrel, check the bore for marks and damage, check the...

As a matter of interest, what oil do you run it on Geo? :-? Didn't run out did it?