sticky spot in the engine

[jakesit]

I've bought a 1987 85 hp Force outboard from someone having idling problems when I went to see it everything seemed to be turning OK. When I put it on my transom about a month later and after cranking it for a while It has one very tight spot on the rotation that the starter barley overcomes. (just as the first piston begins to go down from TDC) it is also very tight turning by hand the piston walls are not scored and there seems to be a large pressure relese when it passes this tight point. Also under the flywheel is a stater I wondered if it might be scrubbing there making rotation hard. I've removed the spark plugs and I get the same issue. Does anyone have any insight? I mostly work on automotive engines myself so I'm new to outboards and 2 strokes in general.

 

[Jiggz]

Use a mechanics stethoscope to localize where the "rubbing" noise is coming from. Start from the flywheel section, the head and then the lower unit. Obviously, you will need to open and inspect to find out where it is at and the mech's stet will help in locating it. Thus reducing the work required. Don't forget to do a compression test also. This will tell you if it is coming from one of the three pistons.

 

[jerryjerry05]

Does it turn easier when the plugs are out?
​Compression test.
Drop the lower unit and see if that makes a difference??

Clean the starter.
Clean/ tighten the battery connections.
Load test the battery.
Check the battery cables for bad spots.

 

[jakesit]

Compression is good, as an update I removed the reed valves and the lower bearing cap seems to have been scrubbing the reed valve casting so I'll be pulling the power head and splitting the case to clean it and find the problem I'm not sure what would cause them to make contact as I don't know the history of the motor.

 

[Jiggz]

When you get enough post can you post pic of the lower bearing cap focused on the rub and also on the v-block of the reed?