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Originally Posted by jedrinck
Does a Hayabusa gearbox last long when it has to move twice the designed weight and 50% more power?
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I suppose that it depends what you do with it!
I've now completed 2 seasons hillclimbing and sprinting on the same gearbox. Most weekends from March to October I do at least one event and some weekends two.
At the end of 2007 the standard Suzuki output shaft sheared shortly after fitting the twin chain system and while trying drag bike chains. For 2008 we fitted a heavy duty output shaft (ie with Honda external splines) and continued to run the twin chain system with an external support bearing but reverting to ERV GP chains. The gearbox has run faultlessly all season. The engine has just been stripped for a winter check and the gearbox looks perfect.
That said, I have been using the clutch for most changes (but not all up shifts) and I do tend to change gear very fast.
So far I've been pleasantly surprised how sweet and reliable the Suzuki 'box has been especially when compared with the 'box in my Caterham.