40 HP Evinrude Slips When Throttled Up

P

Piker

Cadet
Joined
Jun 21, 2002
Messages
6
I have a 1960's 40 hp Evinrude which was running fine last fall, and suddenly started slipping, as if weeds were around the propeller. The propeller will only engage at idle. As soon as I throttle up, it seems to slip. I checked the shear pin and it looks fine. Could fouled spark plugs cause this kind of behavior? Any suggestions?
 
M

mnmfors

Petty Officer 2nd Class
Joined
Nov 18, 2001
Messages
176
Re: 40 HP Evinrude Slips When Throttled Up

spun prop hub? I think you check it by marking the inside of the hub and the shaft in a straight line, watertest, and see if the marks you made are still in line.
 
P

Piker

Cadet
Joined
Jun 21, 2002
Messages
6
Re: 40 HP Evinrude Slips When Throttled Up

Thanks Mike from Mims, Florida. A spun prop hub sounds like the answer. Is this something that I can fix myself or does it have to be taken to a Prop shop?<br /><br />Thanks.
 
D

Down South

Petty Officer 1st Class
Joined
Aug 7, 2001
Messages
333
Re: 40 HP Evinrude Slips When Throttled Up

Hi Piker, <br />Sounds like it's spun pretty bad. You should be able to check it out easily. With the ignition turned off and the motor in gear, try to turn the prop by hand. If the prop turns and the prop nut stays stationary then it's spun. You will have to take it to a prop shop to have a new bushing pressed in. It's usually less than 50 bucks for the repair.<br /><br />Good luck
 
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