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to
Same happened to my XTX, I ended buying a second hand engine from a bike breaker, because unlike you I could just about change a spark plug on the bike and the quote Yamaha gave me to repair the gear snapped was nearly �700 against �70 for a used engine with only 6000 miles on the clock.
A good friend of mine did the engine swap one summer evening over a barbeque party, while I was none the wiser and passing spanners and holding stuff.