Starting problems

[RABS 69]

I stated my mercury 20hp 2 cycle & it ran fine, later that day it would crank but not start. I checked & there was no fire from either plug. What would cause both coils to not fire at the same time?

 

[tomhath]

Re: Starting problems

What would cause both coils to not fire at the same time?

Could be a wire has insulation worn or cracked off and is grounding it (speaking from experience here). Older Merc wiring is notorious for that.

 

[RABS 69]

Re: Starting problems

Could be a wire has insulation worn or cracked off and is grounding it (speaking from experience here). Older Merc wiring is notorious for that.

Thanks tomhath I'll check that out & see if I can go fishing again.

 

[racerone]

Re: Starting problems

Serial # of the motor should be posted.----They are not all the same.

 

[RABS 69]

Re: Starting problems

Serial # of the motor should be posted.----They are not all the same.

serial #0g701354 1998

 

[MH Hawker]

Re: Starting problems

It could be several things, with no spark on both cylinders, that isolates it to a common source, the CDI box or the trigger or the stator.

 

[racerone]

Re: Starting problems

The wiring was much improved on these newer motors.----Find the wires going to the kill switch and unplug it ( black / yellow stripe I think ) and see if there is spark after you do that.

 

[carholme]

Re: Starting problems

Your s/n comes up as:

MERCURY - ( 20 H.P. (1998 ))
Serial No: 0G701354 Model No: 1020312UD

Parts List for mode 1020312UD:

20/25 H.P. 15/20/25 SEA PRO/MARATHON SUPER 15 - Mercury, Mercruiser, Force, etc. Parts Lookup

The service manual you require is P/N: 90-826883. If you do not have one, see my PM to you at the top of this page.

Gerry