Yamaha outboard motor manual

Manuals for Honda Outboards by Seloc 1978 2014

Hello,

Mariner 4hp are identical to Yamaha engines.
You should find a sticker on the port bracket with serial and model number.
If that sticker has disappeard, an aluminum piece is stamped in the side of the cilinder. The numbervstamped in that round pieceis the serial number. I can convert that serial number in a year/model number...

Some models charged through a Magneto, but see if you can find the 1979 Year Manual. I have a 1979 engine myself in a 15Hp which is a Manual start(no battery) and I have a Sailhorse Johnson 8HP which has an electric port and is Manual start. I believe the 8HP would charge a battery as on a Sailboat the running lights needed power. The 8HP could power the lights directly.

Johnson offered options for electric start in lower HP units and options in charging systems to contain costs. You might get a better answer from someone by listing the HP of your motor. I was the original owner of the 15HP and remember the 9.9HP and others in the same Sales brochure. The Sales brochure may advertise more about the charging systems.

Check tilt locks are off,tilt shaft could be frozen

Try .28" or .01mm

remove carb and clean jets etc !

Hey Steven,
get one of these manuals, you will be glad you did,, it will serve you well for as long as you own your Mariner! The guys at MarineEngine will be glad to help you too!!

Mariner Outboard Service Repair Manuals by Seloc 1977 2004

Outboard Motors Boat Parts Marine Engines Inboard Boat Motor

In most outboards, it will flow through the prop itself (through the inner prop). There should be a stream of water coming from somewhere around the back end of the motor itself, called a telltale, which visually shows that the water pump inside the outboard is pumping water up around the motor. If you cannot see this, then there is obviously a problem with the water pump or pump impeller that needs to be corrected to prevent the outboard overheating.