Question: 90 hp johnson outboard revs higher since rope got stuck in prop?

(Posted by: on 2010-08-22 16:34:30)

I am looking to find out if anyone knows what I may have damaged. It use to max at about 5k rpm. Today, it was going to about 6500 rpm but the boat is not going any faster. Does anyone know if there is a shear pin/ gear behind the prop that might be causing this. THe boat starts and runs with no issues, just running higher rpm's

Posted by: jtexas on 2010-08-22, 21:46:10

Your prop has a pressed in rubber hub, designed to protect the drive train from the shock of shifting, and prop strikes. to confirm, paint or scratch a line across the rubber inner and metal outer hubs and run the boat up & down the lake. If your lines no longer match up, the hub is spun. Take the prop to a prop shop to be re-hubbed. Cost should be reasonable.

Posted by: 45 auto on 2010-08-22, 16:47:06

U damaged the prop. I doubt that the 90hp will reach 6500 RPMs with out swapping piston hold.