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Yamaha 150 2stroke rapping noise

scotthyde

New member
"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??"
 
"Yes, it could. I was sure my

"Yes, it could. I was sure my OX66 was loosing a bearing, and it turned out to be that the mid-section bezel had lost a bolt and was vibrating. Then again, it only happened intermitently, mostly on acceleration. Mine was more like a metallic buzzing sound, but really sounded like it was about to blow.

On the other hand, yours could be getting ready to blow!"
 
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