Wow.. damn...
One thing is for sure... you either have another problem that is causing that or that sprag hasn't perfect to start from.
What I can think of is:
1- You either ran the bike without enough oil in it
2- Engine servicing? did you forget to "bleed" the oil and oil pump?
3- Oil pump gone bad
4- Bad oil... what have you been using? Synthetic?
5- Have you mixed different engine oils? different weights or even same weight but from DIfferent brands?! this is very important and is neglected alot of times!
As for #6 I'd check your e-starter.. it might be getting something stuck in it and is when stuck in while you are ridding..........
You can always find a "new-to-you" used engine and go from there...
BTW, can't you backorder one of those sprags from Yamaha?? It will take you quite sometime for it to arrive and you will probably have to pay the shipping.. tho...
Vando
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