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No offence but most of your Yamaha problems seem self induced. It sounds to me if you removed a rag and used a torque wrench and locktite most of your problems would have gone away.
Here’s what it cost me to run a Yamaha:
1 New Woltjer KT100 $1850.
1 New Horstman HDC5B CLUTCH $320.
Every 3 to 4 races take the clutch apart. check the bushing, gear, basket and clutch clearance $5. to $80 depending on needed repairs.
Every couple of races rebuild carb $6.
Every 10 Hours send the engine back to Woltjers for complete rebuild approx. $ 600. Yes they do were out fast which is why your used motor probably blew up so quickly.
Overall still much cheaper then running Rotax.