It is quite feasible to put a different barrel on and run at 150cc.
The clutch/bottom end etc are superb. Normal use will not damage them. They will only give trouble if the oil isn't changed and the filters (yes 2) are ignored. The only one I have seen properly killed in action was on the racetrack, where the end of the gearchange shaft by the clutch casing came adrift because the lead footed lunatic was booting it between gears without using the clutch.
We run cb100n gear clusters in cg125 engines, identical apart from lower 4th and 5th gears. End of race season engine strips have shown absolutely no engine wear whatsoever, even with 11,000 rpm thrashing.
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Harley Davidsons,
The most effective way of turning petrol into noise without the side-effect of horsepower
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