"Have twin 2001 Yamaha OX66 Sa
"Have twin 2001 Yamaha OX66 Saltwater series 150hp 2-stroke (less than 400 hours) with rapping sound (sounds like bad lifters on a car) runs fine up to 5200 rpms just noisy in the last week, compression is fine, all cylinders are running, no scoring on cylinders. Mechanic says the rapping sound is a bearing and the complete power head needs to be replaced for big $$$. Could it be something else??"
"Have twin 2001 Yamaha OX66 Saltwater series 150hp 2-stroke (less than 400 hours) with rapping sound (sounds like bad lifters on a car) runs fine up to 5200 rpms just noisy in the last week, compression is fine, all cylinders are running, no scoring on cylinders. Mechanic says the rapping sound is a bearing and the complete power head needs to be replaced for big $$$. Could it be something else??"