HT Leads

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Feb 3, 2020
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I had a firing problem last year that what identified at Norton as an issue with one of the HT leads. This morning the bike has started missing again so I am assuming it is an HT lead issue again. Has anyone else had similar problems with HD leads and any alternative solutions?
 

Fast Eddie

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I don’t see why you should be unlucky enough to suffer two HT failures in close succession like that. But, if you wanna be sure, changing them for better quality after market items might be wise.

As you’re in U.K. you might consider Magnecor, see towards bottom of page 22 here (this is what I fitted to mine):



Or these by one07 from cNw:

 
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I don’t see why you should be unlucky enough to suffer two HT failures in close succession like that. But, if you wanna be sure, changing them for better quality after market items might be wise.

As you’re in U.K. you might consider Magnecor, see towards bottom of page 22 here (this is what I fitted to mine):



Or these by one07 from cNw:

Thanks Eddie, I will take off the tank to see if anything obvious, but will order a replacement set
 
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And while you are at it ,make sure you have a genuine Bosch coil in there.
 
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I don’t see why you should be unlucky enough to suffer two HT failures in close succession like that. But, if you wanna be sure, changing them for better quality after market items might be wise.

As you’re in U.K. you might consider Magnecor, see towards bottom of page 22 here (this is what I fitted to mine):



Or these by one07 from cNw:

You may like to check your spark plugs...
 

Fast Eddie

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Graeme, you need to do some digging and reading on this forum matey.

Coils, along with all of the various relays on the bike, have been discussed as sometimes being fitted out with cheaper copies of the correct Bosch parts. So it’s worth looking closely at the coil whilst your tank is off.
 
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Graeme, you need to do some digging and reading on this forum matey.

Coils, along with all of the various relays on the bike, have been discussed as sometimes being fitted out with cheaper copies of the correct Bosch parts. So it’s worth looking closely at the coil whilst your tank is off.
Will do
 
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cheaper copies of the correct Bosch parts. So it’s worth looking closely at the coil whilst your tank is off.
 
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OK, got the bike home and started to have a good listen and look.
Firstly, there was a definite intermittent spitting sound every few seconds associated with the erratic running speed. This went away when running the bike on the left cylinder only (ticks over at 1200 surprisingly smoothly). This initially pointed to something suspect on the right cylinder side but then quickly found the "spitting" was coming from a hose disconnected from the air bypass valve. You could see a little blue flame shooting out the end. Anyway, I fitted it back on and hey presto, everything back to normal. I am none the wiser what was happening. Meanwhile, I have ordered uprated HT leads and a Bosch coil to replace the SMPE as a precaution. Thanks to all for advice
 
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According to Matt Capri of South Bay Norton (had him on the phone a few times) the wires were complete shit. Bought the 107 from the Coote's and it made a great difference. More so than the coils. The Bosch coils were the icing on the cake.
 

Claudio

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I'm interested in the topic
what are the differences with new cables?
what benefits do you get?
 
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