intermitent spark

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This topic has 10 replies, 5 voices, and was last updated 12 years, 1 month ago by charlie.

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January 30, 2014 at 5:01 pm #5564

hybridv8
Participant

hi,I thought I would get the barford out and get it going after its winter rest ready for the allotment but the villiers mk 15 hs is suffering from a poor and intermittant spark.I,ve cleaned the points and cleaned the inside of the flywheel and derusted the coil wings and the flywheel but after turning it over with a battery drill (which is pretty fast) I am only getting a weak spark every now and again,any thoughts or advice would be appreciated.

January 30, 2014 at 5:24 pm #5565

vhgmcbuddy
Member

You could give it a good warm up with hot air gun or something similar, might be bit of damp somewhere. I hope it is that simple.

January 30, 2014 at 7:07 pm #5567

darmic1
Participant

The Villiers coils can be a bit fragile. The insulation breaks down and they short to ground causing weak and intermittent spark. Could also be worth checking the condensor?

January 30, 2014 at 9:08 pm #5569

andyfrost
Participant

I would say it’s more likely the condensor.

Andy.

January 31, 2014 at 4:40 pm #5577

charlie
Keymaster

As you will need to remove the flywheel and mag back plate to replace the condensor it would be well worth the extra expense of fitting a new coil.

January 31, 2014 at 5:22 pm #5581

vhgmcbuddy
Member

I’ve sent you a PM regarding your Mk15, it worked for me. Owen.

February 1, 2014 at 3:32 pm #5604

hybridv8
Participant

Thanks for the message owen I will go through it tomorrow and see if it cures it.

February 4, 2014 at 4:06 pm #5687

hybridv8
Participant

Thanks again for the instructions owen,I went through them and still couldn’t get a good spark so I’ve been waiting for a new condenser to arrive,I have now found my multimeter (that mysteriously disappeared) so I checked the coil as per your instructions and on the low tension side your instructions say I should have less than 1 ohm and I have 5.74 and on the high tension side I should have 3 to 5 k ohms and I have zero so it looks like the coil is shot,it just goes to show how fickle these electrics can be as this barford was only used towards the end of last year and as I had nothing to do till the condenser arrived I thought I would get my farmers boy out and give it a dust off as it hasn’t been used for about 2 years and with a bit of fresh fuel it started straight away no bother.

February 4, 2014 at 5:37 pm #5692

vhgmcbuddy
Member

Pity didn’t work, we win some we lose some, as the article was on Villiers seagull I don’t know if the coil readings would be the same for the Mk 15. I will try to find out. Owen.
Had a quick look couldn’t find any thing, but seeing yours read a zero it probably doesn’t matter.

February 16, 2014 at 9:28 am #5865

hybridv8
Participant

Changed the condenser day before yesterday and as a precaution I took charlies advice and changed the coil as well and she has never started so well in the 10 years I have had her,after about 3 start and stops just to make sure everything was right she started bucking back half way through the rope pull (nearly pulled my arm off, it was a good idea to use the rope pull and not the drill as I was previously, could of been nasty ) turned out the flywheel had slipped so she was trying to fire at the wrong time so after a retime and a tighten up everything is good and she starts almost immediately you start pulling.

February 17, 2014 at 8:34 am #5881

charlie
Keymaster

Great news, well worth the expense.
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