Look at the case where it has been "relieved" over the countershaft. This was done to accomodate a 18 tooth countershaft sprocket. The transmission was also modified to have first gear only for hillclimb. Bike also has a 38 tooth rear sprocket. Geared to the moon you call it. Also in the photo are the rotary valves. They have been cut. Pictures courtesy of Steve Reed. Thanks, Mark.