Yamaha Pro60 advice

[Creek Kid]

I've got a 93 Yamaha Pro60 w/ss prop. When I first bought it it turn about 6200rpm and 38mph but started REALLY hard. I bent my lower unit shaft on a rock and had it rebuilt. Never had the prop looked at as it seems to be unharmed. While it was in the shop I had them clean the carbs. Now it starts and runs like a top but I turn 5200rpms and 30mph MAX! Could a bend in a prop blade be completely unnoticable and lose this much power? I want to buy an aluminum prop as a spare but am wondering if I should have the carbs or spark or something looked at too.

[Wade Joseph]

Sounds like something is amiss. Was it rebuilt at a yammie shop? Did they use new parts or stuff from another motor? If the prop was damaged that much I am sure you'd feel it vibrating. But to be sure you can always take it to a prop shop and have it checked.

[Surface Tension]

If you hit something hard enough to bend the prop shaft then you'd have to suspect the prop might have some damage too.

If the prop checks out I'd tend to think you were running lean before the service. That would explain the hard starts.

While running lean might increase your top speed its hard on the engine. Still a drop of 1000 RPMs and 8 MPH isn't normal. I wonder if you lost a cylinder. Pull the cover off and look to see if a plug wire got snagged by the cover latch and maybe pulled from a coil. Next remove the the spark plugs and look for a wet plug.