click the link below for everything you need to know regarding the oil pump drive gear. contrary to internet fodder the failure rate for this gear is actually fairly low...perhaps 2% of all tuber/blast/XB models....something in that vicinity.
is it a faulty design? is it inadequate gear strength and material? is it an ill-designed lubrication system?
NO to all of the above. more than anything else it is operator error.
the TWO MAJOR causes of this gear failing are hammering the throttle and/or high revs prior to the oil in the system reaching proper operating temp......and improper oil viscosity. nothing more/nothing less.
https://www.twinmotorcycles.nl/artik...cid=18&aid=620