G81 Can Cycle said:
Update on Countershaft Sprockets
Dave and Richard sent me a sprocket off a 2013 model that they acquired. We scanned and reversed engineered the sprocket from this model. We made inspection go / no go gauges for the internal spline based on the scan and inspection of the spline. When we went to install the new sprockets for testing, they would not fit on the 2015 model. The under pin measurements of the spline were different by about .010. We are not sure what Norton changed as to fit of this spline.
Dave is at the Norton factory this last week, and will attempt to find out what the change is, and when it happened.
So anyway we are in process of making a new set of sprockets. In the future, we will have sprockets for both splines we have found on the bikes, and hopefully a time (or VIN) when Norton changed the spline configuration
More info to come but we have learned that Norton now has full control of the trans and sprockets whereas they did not in the past. So 2013 and prior models may (or may not) have an issue with replacing sprockets. Time will tell I guess as John has found a 2013 sprocket does not fit a 2015. We still need to get to the bottom of this >> and we will :mrgreen:
Perhaps I will make a manual to show how to measure for this to make sure (or better your chances) of getting the correct sprocket for you bike.
Don't worry, we'll figure it out. :mrgreen: :mrgreen: