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Norton 19S - No spark?

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NORTON 19s NO SPARK

Posted by keith_davis at April 12. 2017

Today we bought a norton 19s it started fine, we got it home it started first time but back fired 2or3 times and stopped and would not start again and there is no spark.

Can you help with problem of no spark.

Thank you.

Re: NORTON 19s NO SPARK

Posted by Ian MacDougall at April 12. 2017

Assuming that the spark comes from a magneto here are the easy things you should check/replace, not necessarily in this order: 1 Does the magneto turn when you kick over the engine? 2 Do the points open and close as the magneto turns? 3 Are the points correctly gapped (0.012")? 4 Are the points clean? 5 Is the spark plug correctly gapped (0.022") 6 Is the spark plug clean? 7 Swap the spark plug 8 Swap the spark plug cap (must be non-suppressor type for a magneto) 9 Swap the HT lead (copper cored).

If you still don't have a spark at this stage you are probably looking at a faulty magneto. It could just be one of the 2 brushes (Earth & HT slip ring) but more likely a failed capacitor or winding insulation. Consult one of the magneto specialists.

Hope this helps, Ian McD

Re: NORTON 19s NO SPARK

Posted by keith_davis at April 13. 2017

Previously Ian MacDougall wrote:

Assuming that the spark comes from a magneto here are the easy things you should check/replace, not necessarily in this order: 1 Does the magneto turn when you kick over the engine? 2 Do the points open and close as the magneto turns? 3 Are the points correctly gapped (0.012")? 4 Are the points clean? 5 Is the spark plug correctly gapped (0.022") 6 Is the spark plug clean? 7 Swap the spark plug 8 Swap the spark plug cap (must be non-suppressor type for a magneto) 9 Swap the HT lead (copper cored).

If you still don't have a spark at this stage you are probably looking at a faulty magneto. It could just be one of the 2 brushes (Earth & HT slip ring) but more likely a failed capacitor or winding insulation. Consult one of the magneto specialists.

Hope this helps, Ian McD

Thank you for that.

We started it with kick start but we got home we used a electric wheel start which turned the engine over very fast it started it back fired Big Bang and stopped do you think we have blown some thing.

Re: NORTON 19s NO SPARK

Posted by Ian MacDougall at April 13. 2017

I doubt that you have caused any serious harm. Work through the checklist above, that may reveal a simple problem that will restore the spark. If you can get a spark then check the ignition timing (on a 19S, full advance, the points should open at 11/16" before top dead centre). If the timing is wrong it could explain the bangs. If you still can't get a spark then I'm afraid you will need the services of a magneto specialist. One other thing, some modern spark plugs have resistors built in. Do not use this type of plug with a magneto.

Re: NORTON 19s NO SPARK

Posted by David Cooper at April 13. 2017

If it did start then timing can't have been totally wrong at that time. If it went "bang" and now refuses, it is possible that timing has slipped due to sudden shock.

But starting cold and not starting hot are classical signs of magneto issues.

Re: NORTON 19s NO SPARK

Posted by Bruce Mitchell at April 13. 2017

Previously Ian MacDougall wrote:

I doubt that you have caused any serious harm. Work through the checklist above, that may reveal a simple problem that will restore the spark. If you can get a spark then check the ignition timing (on a 19S, full advance, the points should open at 11/16" before top dead centre). If the timing is wrong it could explain the bangs. If you still can't get a spark then I'm afraid you will need the services of a magneto specialist. One other thing, some modern spark plugs have resistors built in. Do not use this type of plug with a magneto.

 

Just out of interest, why not use this type of plug with a magneto?  I understand there is no benefit but what is the drawback?

 

Re: NORTON 19s NO SPARK

Posted by john_holmes at April 13. 2017

The resistance decreases the gap the spark will jump on the plug.

http://www.brightsparkmagnetos.com/faqs/FAQs%20about%20magnetos%20generally/Are%20suppressors%20and%20resistor%20sparking%20plugs%20OK%20to%20use%20with%20magnetos.htm

 

As you can see, a suppressor does appear to require the magneto to do considerably more to achieve a significantly poorer spark. Also, note that the higher the voltages that the HT winding generates, the greater the risk of breakdown of the insulation of the HT winding.

Re: NORTON 19s NO SPARK

Posted by keith_davis at April 16. 2017

Thank you, a new spark plug and it started so don't know what we did.

Re: NORTON 19s NO SPARK

Posted by Ian MacDougall at April 16. 2017

That's encouraging. Next step is to see whether you still have a spark when things get hot (as suggested by David). If there are no other urgent issues to deal with take it for a run, 10-20 miles should be enough but have a back-up plan to get home again if the sparks give up!

Cheers, Ian McD

Re: NORTON 19s NO SPARK

Posted by Bruce Mitchell at April 18. 2017

Previously john_holmes wrote:

The resistance decreases the gap the spark will jump on the plug.

http://www.brightsparkmagnetos.com/faqs/FAQs%20about%20magnetos%20generally/Are%20suppressors%20and%20resistor%20sparking%20plugs%20OK%20to%20use%20with%20magnetos.htm

 

As you can see, a suppressor does appear to require the magneto to do considerably more to achieve a significantly poorer spark. Also, note that the higher the voltages that the HT winding generates, the greater the risk of breakdown of the insulation of the HT winding.

 

That makes sense. Thanks!

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