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changed the stock front sprocket(16T) to a Driven 17 Tooth. in this video i open and install a after market front sprocket without cutting or taking off the chain. i did not buy a speedo healer yet! stock % that the bike is off is -5.2. with me going 1 up in the front and keeping the rear stock. It puts the % out after the change to +0.7 so id did not see the need for one right now. I will buy one at some point. my next video will have a test ride before and after the change. i hope this video was helpful!