1992 force 120hp L drive on a 19.5 Bayliner. very low power, only about 5 mph

[Michael Yarmas]

1992 force 120hp L drive on a 19.5 Bayliner. very low power, only about 5 mph on water.
I ran a compression test very happy to find 150psi on all 4. Top two spark plugs dirty, bottom two clean. No spark on the lower two cylinders. ( Original electronics had been replaced with CDI, before I bought it) Did a Ohm test on stator and it was 590. Seems a bit high. Switched the two blue wires no change still no spark on bottom two. Swapped the two yellow, still no spark. Removed all wires one screw at a time and cleaned and replaced, no change. Changed the order of the green wires and now have spark on lower two and no spark on upper two.
So I believe the Switch box is bad? Is there a test I can perform on the switch box?
Also my tach is not working not sure what is up with that and if it is part of the over all problem, all wires are connected.
This is my first time working on an out board motor ( lots of experience on a ford 302 but none on a outboard)
Thanks for any direction

 

[jerryjerry05]

Re: 1992 force 120hp L drive on a 19.5 Bayliner. very low power, only about 5 mph




First thing to do is change all the wire connectors on the stator,trigger and both packs.
Then change start it.
See if that makes a change.
No change move switch box/pack around and see if it changes position.
I'd run tests on the stator first.
outboard ignition .com or CDI electronics has a repair section.
You'll need a meter an d a grounding harness or someway to ground out the plugs see pics..
Profile?Location? You might be close to someone who can help??

 

[Michael Yarmas]

Re: 1992 force 120hp L drive on a 19.5 Bayliner. very low power, only about 5 mph

Thanks for the info. I changed the connectors, but no change. I only have a regular volt ohm meter so I could only do a ohm test on stator.
I switched the trigger wires around and the problem stayed the same no spark on the lower two cylinders. so I believe the switch box is bad.
unless you can tell me I am missing something I will order a new switch box.

Thanks

Mike

 

[Michael Yarmas]

Re: 1992 force 120hp L drive on a 19.5 Bayliner. very low power, only about 5 mph

Thanks for the info. I changed the connectors, but no change. I only have a regular volt ohm meter so I could only do a ohm test on stator.
I switched the trigger wires around and the problem stayed the same no spark on the lower two cylinders. so I believe the switch box is bad.
unless you can tell me I am missing something I will order a new switch box.

Thanks

Mike

Success!!!!
I got a new Switch box and now she runs like a champ!!!!
its so nice to have full power
Thanks for the great advice.

 

[ldriveswaper]

Re: 1992 force 120hp L drive on a 19.5 Bayliner. very low power, only about 5 mph

What do you mean by switch box? The two coil packs?