Is that 12000w surge or continous, or 6-7000w continous load, does it
supply 120v 60hz at no load and full load, or does it sag so 90v 50hz?
How good is the govenor and output. There is alot more to generators
then a frame, motor and gen head. It may be a deal, or it may be a
dump, you should find out first.