Wemoto.co.uk would surely have a +1 [virtually all 600cc+ yams use the same spline size] front sprocket.Okay so I found a -3 rear sprocket which gives about the same change in ratio.
+1F 17/46 = 0.369
-3R 16/43 = 0.372
Is there any reason why changing the front sprocket is preferred to changing the rear or should I just go with the -3 rear ?
Cheers for the info - I found Wemoto site but they only list standard front for the XJ6 on the website, different sizes for the rear.Wemoto.co.uk would surely have a +1 [virtually all 600cc+ yams use the same spline size] front sprocket.
The reason changing front is 'preferred' is that +1 is going to shorten the chain run up a wee bit, but -3 at the back is going to extend the chain runa lot more (maybe taking the adjusters to their limits in the worst case).
Other factors may be: A bigger front sprocket provides a slightly less tight change of direction for the chain leading to less wear and potentially no need to remove the rear wheel to do the job.
I put a 17T on my first XJ6, it is a tight fit as their is a 'guide' that the chain will run against but it is not big deal.
HTH
Merv