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Old 20-08-17, 09:12 PM   #11
nickh
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Quote:
Originally Posted by Chippie View Post
Ahh..ok.
Thanks for the reply anyway.....65! Yeeeeouch!..
I have engines not worth that....
The nature of this hobby (and others) is that you often spend more getting something up to snuff than it's eventual resale value. It's supposed to be fun and fun has to be paid for!

NHH
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Old 20-08-17, 09:29 PM   #12
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Originally Posted by hortimech View Post
Yes that is a magnetron coil and if you haven't got a spark, then there are several things you can check. What is the airgap between the coil legs and the magnet in the flywheel, it should be about 25thou. do you have a spark if the stop wire isn't connected the coil, much time has been spent testing coils etc when the fault is the OPC system (oops OPC = Operator Presence Control). If the airgap is correct, the magnet in the flywheel is magnetic and there isn't a spark with the stop wire disconnected, they it sounds like you will need to airtest the coil and find a new one.
Thanks for the comprehensive reply

The mower was running fine a couple of weeks before, coil position relative to flywheel not disturbed so air gap OK, fault finding tried is:
Car battery connected by jump leads in case mower battery low
Fitted new spark plug, old plug was wet so fueling OK
Stop lead disconnected
Flywheel magnet seems still strong
Resistance from plug lead to ground through coil 2.6K ohm

OPC is a non fitted optional extra, brake and cutter interlocks inhibit the starter which turns over fine so they're OK.

It's looking like I will need to try another coil?

Stuart.
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Old 21-08-17, 09:43 AM   #13
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Going a bit off-piste discussing Villiers coils on a B&S tread but you can get cheaper Taiwanese copies that work well for a lot less.
BTW plenty of B&S coils on fleabay
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Old 21-08-17, 10:40 AM   #14
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Going a bit off-piste discussing Villiers coils on a B&S tread but you can get cheaper Taiwanese copies that work well for a lot less.
BTW plenty of B&S coils on fleabay
Ordered one this morning

Stuart.
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Old 21-08-17, 05:12 PM   #15
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Quote:
Going a bit off-piste discussing Villiers coils on a B&S tread but you can get cheaper Taiwanese copies that work well for a lot less.
BTW plenty of B&S coils on fleabay
Taiwanese villiers copies don't fit, that why I don't use them, still off topic.
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Old 22-08-17, 08:54 AM   #16
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Mine did and engine starts and runs well
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Old 26-08-17, 10:15 PM   #17
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Just to conclude the thread, fitted a new magneto/coil and it ran for 30 seconds, so then I turned the fuel on and it's going like a good 'un.

https://youtu.be/0P0_uJqUOtM

Stuart.
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Old 26-08-17, 10:25 PM   #18
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(snip) so then I turned the fuel on and it's going like a good 'un.
I'd like to say live and learn but how many times have I cursed a non-starting engine and then turned the fuel tap on, switched off the kill switch etc etc?!

NHH

Last edited by nickh; 26-08-17 at 10:29 PM. Reason: sp
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Old 27-08-17, 12:25 AM   #19
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I did that the other weekend, turned the wolseley wd off after running for 20 minutes to try and sort a pump that wouldn't prime. Had a play then really struggled to restart it as both pumps primed straight away before it was even running, was a proper pain to get going, once running I walked away to put the kettle on, and it bloody stopped, yup fuel still in off position

Neil.
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Old 27-08-17, 10:14 AM   #20
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When I went to collect the CPR it had a duff mag with no sparks, when I got home and looked at the engine I found the seller had been turning it backwards, put the handle on the other side and turned the right direction and a lovely fat spark....
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