1989 Johnson 120

[Deuce]

Hi,

When I first begin to throttle up the motor is sluggish and sometimes doesn't propel the boat at all. It's strange because it looks as if the prop is spinning because I can see the bubbling action at the prop. After throttling down and back up a few times the problem goes away and the motor is good for the rest of the day. A friend said that it is a spun prop. But if that is the case why would it be fine after it was warmed up. Seems to me a spun prop would be a ongoing problem. Any ideas?
Thanks.

 

[kenmyfam]

Re: 1989 Johnson 120

Hi,

When I first begin to throttle up the motor is sluggish and sometimes doesn't propel the boat at all. It's strange because it looks as if the prop is spinning because I can see the bubbling action at the prop. After throttling down and back up a few times the problem goes away and the motor is good for the rest of the day. A friend said that it is a spun prop. But if that is the case why would it be fine after it was warmed up. Seems to me a spun prop would be a ongoing problem. Any ideas?
Thanks.

Mark the prop and hub, go for a spin and see if it is still in the same position afterward. If it moved it is spun.

 

[tashasdaddy]

Re: 1989 Johnson 120

the hub may be heating up due to the friction, and then holding.
Spun prop

Propeller: shear pin, is the also known as the drive pin. the propeller is made of and inner case and outer case, with the blades, between them is a pressed in rubber bushing. that holds the two parts of the prop together.

a SPUN HUB is when the bushing get worn, and fails. the inner will spin, with the prop shaft, but the outer will not spin, due to the bad bushing.

take a permanet marker (sharpie) and draw a line across your hub. run the motor, then check the line, most likely it is not aligned anymore
Attached Thumbnails

 

[Deuce]

Re: 1989 Johnson 120

Thank you for the advise. I'll mark the prop and take it for a spin on Friday. I'll let you know what happens...