Most people take the engine out through choice. IE they are doing the bike up and painting the engine or powder coating the frame. It is very rare to hear of an engine being removed because of mechanical breakdown. They are very over engineered in that department so do not tend to wear out. The only rebores I have heard of are for Big Bore kits (865cc) or because of poor storage so the bores have rusted. The biggest mechanical issue with these bikes is unquestionably the starter clutch. I have had 4 or 5 fail but as this is the same starter clutch as used on many other Kawasaki twins and fours I feel it has reached and passed its design limits with the starting demands of our mighty 750 twins.
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