year of mercury 4hp

[tosh]

Just got a merc 4hp two stroke model 5590359 can any one tell me the year? It also has no spark what should i check first?

 

[AMD Rules]

Re: year of mercury 4hp

That's a 1980/1981 4hp 2-stroke Mercury "Gnat"

Chasing down spark issues is cumbersome without a DVA meter, so you'll be looking for resistance readings for the coil, etc if you dont have one.

First things first... disconnect the stop circuit (orange wire) to see if it then has spark. You could simply have a faulty stop switch. Easy fix.

Next, check the flywheel key to ensure it is not sheared off.

Do you have spark on either cylinder? If yes, the ignition coil(s) would be prime suspect, but any of the other electricals would be causing a complete no-spark scenario on both cylinders (unlikely both coils would fail at the same time).

Hopefully it is not the powerpack...as they are -very- expensive to replace.

_________________________________________

Wiring:
Stator: Yellow - screw terminal on powerpack
Brown - Brown on powerpack
White - White on powerpack

Powerpack:
Black - grounded to engine block
Orange - screw terminal on powerpack
Blue/white - Coil Neg #2
Blue - Coil Pos #2
Green/white - Coil Neg #1
Green - Coil Pos #1

Stop switch:
Orange - screw terminal on powerpack
Black - grounded to engine block

Good luck.



.

 

[tosh]

Re: year of mercury 4hp

Thanks for the info on the year. Checked the stop circuit wire and took readings on the coils,fly wheel key ok all paned out. Broke down and got the power pack and started second pull ......not cheap but it works. Thanks for the help.