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Old 15 September 2014, 13:57   #1
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Country: UK - England
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Make: quicksilver 310
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Stator plate

So we have any one good with outboard electrics, I have a yamaha f40 that won't start and I'm getting a weak spark.
So far I have tested the stator plate as I think that is where the issue is and I'm getting a reading of 6ohms on the power could 25v ac and 679 ohms on the charge coil. Can anyone offer any pointers but I think it's shot
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Old 15 September 2014, 14:47   #2
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Not being a smart-ass but with Yamaha's as dependable as they are..when something go's wrong, unless a reply from someone who's had the same problem/fix, Go to the manual. Actually quite odd a Yam will muck-up without some kind of help. I run a small merc, but I know mercs and some o the merc weak pints (coils) namely. But with an engine as dependable as a Yam...go to the service manual or take it to a reputable yam service shop. Good luck.
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Old 15 September 2014, 15:01   #3
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thanks for your reply nightfisher i have had a look at the manual and there are fault finding tips, i just want to make sure im testing right
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Old 16 September 2014, 05:00   #4
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I'm not saying it's not the plate, but have you checked the HT leads?

Granted my lump of premix burning history uses older school HT tec, but I have found on two occasions the connector in the lead eventuasllty comes loose form the cable itself.....

Also have you changed the plugs- I meggered mine for a laugh & was gobsmacked as to how much less resistance between the business end & earth there was on a 1YO plug.... One I tried had been in the lawnmoeer for years was almost dead short for the High voltage......
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Old 16 September 2014, 09:38   #5
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Stator plate

I have put new plugs in for the sake of it just in case, but I will check earths but I don't think that comes into play when checking the resistance of the coils on the stator
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