Not sure about the 650 but the rubber damped front sprocket was worth the extra couple of quid on the Vee, significant reduction in chain noise and it's what the Japanese usually fit from the factory. Just check your existing sizes as pattern parts suppliers have been known to have the wrong sizes on record. I tried a JT chain as it was vastly cheaper, it hasn't lasted as long as I might have hoped so I will revert to DID next time.