What,s up with the delay? Can't even order shop manual at dealer. Europe shows all kinds of good stuff.
I wanted a larger front sprocket too. I went through the JT catalogue, they have an awesome section with technical drawings and specs. I ordered 17T sprocket for a Triumph 800/865 twin, #JTF1183. I fits perfect on the shaft but I had to adjust the spacing with washers. There is an R6 sprocket that fits perfect but I couldn't find any bigger than 16T. The chain was a tiny bit too short, so I lengthened the swingarm slots about 1mm. The chain also barely touched the plastic protector in front of the sprocket but I left it alone to make it's own clearance. The gearing seems really good now, it could probably stand to be a little taller in top gear, but first is pretty steep now. Second seems better for tight corners now, before it seemed so low it was more work to be careful with the throttle. Fuel mileage seems to be up a bit too, but the winds have been against me lately so I can't really tell yet.I would like either a 17T or 18T front sprocket.