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Originally Posted by Manga I thought the generator locknut coming loose was a pre-1999 engine problem? Can I id my engine year of manufacture from the serial No? Bike is on an 02 plate and has Showa/Ohlins - could the engine be old stock?
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Easy way to tell a early engine from the later one is the amount of yellow wires coming from the casing on the LHS, if it has 3 its the later 3 phase generator with a completely different design of alternator and are far less prone to the Nut coming undone than the earlier 2 Phase alternator.
But as mentioned any poorly fitted Nut can come loose and to make sure its done up tight on either version a decent alternator holding tool is required.
If it is the later one and has never been disturbed since it left the factory it would be a rare case if it has come loose
Note Chris's link above relates to the early 2 wire single phase setup