I've written so much material on the clutches on this bike I don't really want to write anymore. Take a look at the Carbon Fiber clutch page and you'll find lots of text on the clutches on these bikes. Same thing with the Clutch Springs page - each one contains a lot of information on the clutches in these bikes 
40,000k on a clutch? Sure, if it's driven like Grandma the clutch will probably last 100,000k or more. This is possible with a CBR 600 RR because it has enough power. The 125 on the other hand, due to it's small size, lends itself to being beaten mercilessly. It's a small bike. To make the small bike go faster you typically are harder on it.
This is why I developed new clutch springs and this is why I brought out Carbon Fiber clutch disks. To improve on the weak links with respect to the clutch side of the bike. Same thing with the Performance Pack. All of these products are designed to address these very areas. To make the bike perform better and also to address the weak links so that it can handle the increased stress that people tend to subject the bike to
Having said that, always be sure the clutch lever freeplay is at 15mm, not having the clutch lever freeplay set correctly will result in early clutch wear.
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