1974 40hp evinrude slipping

[Triangleboater]

Got the engine a few weeks ago not running, did a compression check it passed and it shifted in and out of gear so i took her home. Changed the lower unit oil, put a carb kit and cleaned her out real well and dropped the lower unit and put a new water pump kit in. (there were things growing and hatching in there so obviously hadn't been run in years. Well I got her running real nice in the barrel. Pumped water really well and shifted into forward and reverse. So onto the sea trial.

Took her out yesterday and she was performing good for the first five minutes or so then would start slipping a reving up while in gear. I would lower rev's and it would do ok then slowly raise the throttle and same thing. It felt like the prop was slipping. But, it took the prop off and it doesn't look like it has the rubber like the more modern props and motors. The shear pin on the prop was good to go.

Could it be I didn't hook the linkage up correctly and it is poping into neutral? I did have trouble getting the shift linkage hooked back up through that little plate.

Anyways, any advice would be helpful!
Thanks!
John

 

[Daviet]

There is a rubber bushing of sorts between the hub that the drive pin goes through and the prop itself. It sounds like a spun hub by the way you described it. Remove the prop and scribe a line between the prop hub and the prop, run it till it slips, then remove the prop and check the scribe marks. If they don't line up anymore, the hub is spinnig in the prop. You will have to have the hub replaced or find another prop.