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Old 05-23-2014, 01:58 PM   #1
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Suzuki SV650 2nd gen

Obvious/Not So Obvious Reason for size of Countershaft gear socket?

Hey guys,

I was reading a few build threads and i noticed that the ninja 250 and ninja 500 have like a size 8 socket with two bolts that secures the sprocket to the bike.

Is this a small set of bolts because theres not much displacement moving the sprocket? I cant figure out why, for example, on the sv650 the countershaft socket size is 36mm

The only reason i can come up with is displacement requiring this socket to be so big, i can only assume its the same size or bigger on super sports and litre bikes, has anyone noticed any thing that similar or that would make them think otherwise?

Im curious to know why these bolts are so big on some bikes, and very small and easy to remove on others. This would be a big deciding factor (for me) on future purchase of bikes, how easy it is to remove that nut, on a ninja 250 (especially since they updated the body work and they look so great) would be a much better purchase long term for wrenching on your own bike (smaller investment in tools etc etc.)
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Old 05-23-2014, 02:13 PM   #2
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'07 Ninja 250 (sold)
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On the ninja 250 the two bolts do not actually hold the sprocket in place. They hold a plate in place that goes into a groove on the splined shaft. Has nothing to do with engine size. Just a different way of doing the same thing.
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Old 05-23-2014, 02:15 PM   #3
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A large socket is really only about $15 tops so that shouldn't be a deciding factor in your multi-thousand dollar motorcycle purchase.

Either way, the job of the sprocket nut is just to keep the sprocket from moving laterally on the output shaft. All power in the shaft is transmitted to the sprocket via the splines on the ID of the sprocket/OD of the shaft. The one big nut and lock washer vs two small bolts are just two different ways to do the same thing.
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