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The impossible question.

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Re: The impossible question.

Posted by peter_maple at October 11. 2018

Previously robert_tuck wrote:

Intermitent ignition sounds the most likely. Check the earth brush in the mag ,check that the champion caps are NON resistor. If the mag is a bit weak it wont like them. That popping and banging is fuel being ignited in the exhaust. Try closing the points gap on the mag to 10 thou.Check you have the leads the right way round.

I used to cross over leads when I parked my bike in the street as a means of preventing the engine from being started.  Left the bike (Triumph 5T ) outside a hotel in London once. In the morning it as gone.  Found it a few hundred yards away parked by the kerb with a small patch of oil under it.  Think the T-leaf must have kicked is heart out before giving up thinking the bike wasn't worth stealing!

Re: The impossible question.

Posted by paul_standeven at October 11. 2018

Probably too tired from kicking the bike to push it away.

My bike has a pull-knob for a permanent kill on the magneto, but if someone disconnects the lead, that stops working.  Your idea is a very good one.

But one thing, surely a 5T left more than a small patch of oil?

Paul

Re: The impossible question.

Posted by anna jeannette Dixon at October 12. 2018

Previously peter_maple wrote:

Previously robert_tuck wrote:

Intermitent ignition sounds the most likely. Check the earth brush in the mag ,check that the champion caps are NON resistor. If the mag is a bit weak it wont like them. That popping and banging is fuel being ignited in the exhaust. Try closing the points gap on the mag to 10 thou.Check you have the leads the right way round.

I used to cross over leads when I parked my bike in the street as a means of preventing the engine from being started.  Left the bike (Triumph 5T ) outside a hotel in London once. In the morning it as gone.  Found it a few hundred yards away parked by the kerb with a small patch of oil under it.  Think the T-leaf must have kicked is heart out before giving up thinking the bike wasn't worth stealing!

 

hello  well i have a well hided switch  on my bikes  and it wired in to handle bar kill button   but in this norton model 99 case its not the ignition problem ,but a fuel problem   with wrong jetting and maybe the pilot jet  too small  witch should be a 25 pilot jet  and a 220 main jet 106 needle jet  for 928 mk1 concentric  carburettors  or obtain a mono bloc 376 1.1/16th  with a 250 main jet  25 pilot 106 needle jet  with a D needle  and 3.1/2 cut away throttle side   and champion N9BYC   Or N6Y  both have the same heat rating  as N5      but with better shielding    yours  anna j

Re: The impossible question.

Posted by vinny_tray at October 14. 2018

Good evening everyone.

Thankyou again to everyone who has posted advice on this thread.

As promised I am posting an update and can report we have had success today on the Norton.

As the majority of you all advised it was a feeling issue and were correct it was running very weak.

Even though I had checked the fuel flow from the fibre glass tank through the petrol tap I thought it to be sufficient it turns out that I was incorrect.

After removing the tank and rigging up a remote tank I can confirm that we now have a free revving engine.

All be it the jetting is not right but at least it starts and revs at will.

I have changed the plug caps and checked the earth brush on the mag but it was definitely the tank and fuel tap.

So it looks like a new tank and petrol tap is on the horizon.

Can anyone recommend one of the Indian suppliers or is that just a no go area?

Once again thanks to all that took the trouble to advise me.

Ride safe.

Vinny.

Re: The impossible question.

Posted by anna jeannette Dixon at October 16. 2018

Previously vinny_tray wrote:

Good evening everyone.

Thankyou again to everyone who has posted advice on this thread.

As promised I am posting an update and can report we have had success today on the Norton.

As the majority of you all advised it was a feeling issue and were correct it was running very weak.

Even though I had checked the fuel flow from the fibre glass tank through the petrol tap I thought it to be sufficient it turns out that I was incorrect.

After removing the tank and rigging up a remote tank I can confirm that we now have a free revving engine.

All be it the jetting is not right but at least it starts and revs at will.

I have changed the plug caps and checked the earth brush on the mag but it was definitely the tank and fuel tap.

So it looks like a new tank and petrol tap is on the horizon.

Can anyone recommend one of the Indian suppliers or is that just a no go area?

Once again thanks to all that took the trouble to advise me.

Ride safe.

Vinny.

 

Hello be very wary of Indian  made  Norton Tanks  some are a real nightmare and do NOT fit Right,   try to find an Original    one  is my add vice  and have it pro cleaned and repainted  and Enthrenol  treated  with Harley Davidson Tank Sealer 100% ethanol proof,               yours   Anna J Dixon

Re: The impossible question.

Posted by ian_hay at December 02. 2018

Previously robert_tuck wrote:

If the leads were crossed it would not idle,so its not that.  I still wonder about a weak spark, close up the plug gaps to about 10 thou,If that helps it will be an indication. Mag condenser?

Robert, I realise it's a bit late to answer this post, but if the leads were crossed

the engine wouldn't even run!!

Ian Hay.

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