My brother and I bought Yamaha 2000's at the same time for use on an off grid property. Both of them had severe oil leaks at approximately the same number of hours under warranty. Both of us took them in for authorized warranty repair and both of us waited almost 6 months for the repairs to be done.
BOTH units STILL have a substantial oil leak after "repair.". Both of us wrote letters to Yamaha Motorsports USA and neither of us received a reply........... and both of us now have Honda 2000s and are quite happy. No more BLUE for us -ever.
I made a vow that anytime anyone mentioned a Yamaha generator I would put in my $.02 and relate of our abominable experience. EPIC FAIL for Yamaha.
YMMV