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Ok, so I just replaced sprockets and chain. New parts from sv racing. Question is, what is the purpose of the thick rubber coating on the stock sprocket? The replacement sprocket was just a chunk of steel so I was surprised to see that rubber on the old one.

I searched the forums but couldnt find explanations.

Thanks, Kevin
K6 Dl1k.
 

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The rubber is for noise reduction. Some say that the solid steel sprocket doesn't make that much more noise than stock and others say it does. Wear ear plugs and enjoy the ride.
 

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I think the Economy Prevention Agency only allows new vehicles to emit 93 decibels ( may be old number).

Motorcycle designers then spend a lot of time reducing other noises that the potential purchaser has no objection too. Most of the design of your intake system is to muffle noise. Even water cooling has the lower noise benefit.

The rubber snubber on the sprocket reduces its ringing.

Now they have decibels left over to try to develop a pleasant exhaust note.
 
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