have a 3 yo Yamaha 50 2-stroke

Has not been run since June ( 5 MONTHS)

filled it with gas and started reasonably easy.
Putt-puted around a while, ran fine

when opening it up it could not get any speed...could not get over 3800 RPM.

towed to shop.
shop called and talked to GF, said repairs would be $1300.00

told her the problems were from not being run. everything that pertained to fuel was messed up from not being ran.

does it sound like a good diagnois and a fair price?

thanks,
John