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Old 03 June 2012, 06:17   #1
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Mercury 6hp 2 Stroke advice please

Hello chaps,

I had my little SIB out last weekend with my 1997 Mercury motor running sweetly all day, running smoothly and pumping water ok. Before I put it away I thought I would start it and run off any fuel left in the carb, unfortunately it wouldnt start.

I got it home and checked both cylinders for a spark, nothing

I removed what I believe is the kill switch lead, (yellow and black wire with a bullet connector) still nothing. I suspected this first as the motor was running so well prior to shutting down.

When I removed the HT leads from the coils, there was a lot of nasty looking grease inside the coils, I have cleaned this out with electrical cleaner spray and put the connectors back in, the leads appear ok as do the plugs.

I guess it would be unlikely that both coils would fail at the same time, before I take it to a repair shop, has anyone any suggestions as to what I could try to identify the faulty component/s?

Thanks in advance for any advice, I am gutted that I cant get out this weekend.
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Old 03 June 2012, 07:27   #2
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What did the spark plugs look like?
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Old 03 June 2012, 07:36   #3
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Here are pics of the plugs, dirty HT lead connector and side of motor showing bullet connector that I unplugged to check killswitch.
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Old 03 June 2012, 07:43   #4
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Have you cleaned them up at all or is that exactly how they were when removed?
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Old 03 June 2012, 07:58   #5
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It's either fouled plugs (but they look okay) kill/stop switch, stator/trigger, Cdi/switch box. It's the process of elimination now.... Chase all wiring make sure connections are solid, remove any grime or corrosion, get a voltage meter to test the stator.

Found this on another forum:

First unplug both stop wires (black with yellow stripe), going to the stop button and the emergency stop switch.

Then retry to see if the plugs are firing.

If not, you need a peak voltage meter to measure the voltages coming form the stator and trigger (could also be done by measuring the resistance, however peakvoltage is more accurate). If the stator and trigger are o.k., you need to replace the switchbox.

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Old 03 June 2012, 08:03   #6
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http://www.cdielectronics.com/downlo...14-4952A30.pdf
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Old 03 June 2012, 08:11   #7
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Thanks for that, some good placed to start. Thats how the ignition leads where when I disconnected them, prior to cleaning. The plugs looked clean, I will check them again when I have cleaned and checked everything.

One thing I did find, on the other side of the motor there was a thin pushrod that came off when I took the cover off. I found a pic of the same outboard on google and highlighted a component.

I am not sure what the part is that I have circled in the pic but when I put the push rod back on at weekend I didnt put it back on the same place as I wasnt sure where it had come from.

It doesnt look like its related but obviously I will put that right and check everything before going any further.

Thanks again for the advice
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Old 03 June 2012, 08:33   #8
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I'm not sure, but I reckon that's your "in gear" protector rod - it stops you starting the motor while in gear - it certainly would explain your problem!

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Old 03 June 2012, 08:36   #9
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Quote:
Originally Posted by willk View Post
I'm not sure, but I reckon that's your "in gear" protector rod - it stops you starting the motor while in gear - it certainly would explain your problem!
That could be the problem!
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Old 03 June 2012, 14:40   #10
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Well I tried it this afternoon (in the rain) and it is trying to fire, I couldnt get it started but it is sparking. I will give it all a good clean over tomorrow including the coils etc, and try again with some fresh juice.

Thanks for all your help
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