Disregarding the usual blantant advertising blah from Trev (how much are they paying you?). How come everytime somebody puts their kart up for sale in the wrong place they get jumped on, yet he constantly tries to place free advertising on this forum for his chums.
Going back to the original question though, firstly, the Gen spec GX160 does not conform for MSA racing, if for no other reason than it is not stamped with either QHQ4 or QHG4. Other than the crankshaft it is also possible you have the quiet run version than has a nylon camshaft sprocket. So both will need replacing. That's before you start considering different specs of piston and head volume etc.etc.
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