Recent content by merc850

Mercury Manual C-90-75512 8C-12 ACCESORIES

Have you bled the cylinders?

https://www.oldmercs.com/category_s/1188.htm

Check the AC voltage across the yellow wires it should be 13+ and go up when the motor speeds up. Rectifier testing.

This is the wiring diagram for the inside the boat pump

Here's the truth about reed valves: if one or more are stuck open, broken or chipped that might cause carb firing.

Looks like a good motor, how's the spark - LU?

This is what I found in the '75 manual - if it uses screws they're Nr. 3 Philips, undo them and pull the handle out; maybe all it needs is greasing. There's a possibility that the stator plate under the flywheel is stiff/seized only way to find out is to try and rotate it.

Parts are here including operator's manual https://www.oldmercs.com/

Pull the powerhead off the DSH then strip it down to the bare block follow these instructions I'm assuming that a Classic 50 has no cylinder head.

If you're moving it on the road tighten the knob to hold it up or put a 2x4 in the space don't use the tilt locks.

On the trim pump there's a knob turn it CCW.

I had an old distributor with the same problems so I removed the grommet and dug out the epoxy? and found the terminals - I used a dremel tool with a round tip.

Take the cowling off and check the movement (not running) of the throttle arm from idle stop to full. At idle (N) the arm should be on the stop - at full the arm should hit the throttle stop. Adjust the barrel in the anchor to pull the arm to idle stop. Maybe you should grease the box if it has...

https://www.oldmercs.com/category_s/2010.htm