Intermittent ignition fault

Information relating to the Matchless G2 or AJS Model 14 250cc Lightweight
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David Simmons
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Posts: 8
Joined: Sat Aug 19, 2023 12:06 am
Location: West Yorks UK

Intermittent ignition fault

Post by David Simmons »

Having a problem with my 1962 G2. The ammeter, when switched on, drops to the -ve range. I then attempt to start the bike, it coughs and fires for maybe 6-8 times, then dies and the ammeter is then on 0. I operate the kickstart lever, and after several attempts the ammeter then goes back to negative, and the whole process starts again.
Bike had a 12v negative earth conversion before I got it. This is a new fault, bike ran when purchased.
My question. Where to start looking for intermittent ignition faults, and is this a common one?
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Ralph
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Posts: 87
Joined: Tue Jan 07, 2020 7:00 pm
Location: UK

Re: Intermittent ignition fault

Post by Ralph »

Check the points are clean and opening and closing right gap and not sticking,
it will only show a discharge when the points are clean and closed as the points
open you should see the amps return to the middle
Ralph

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Red Gauntlet
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Posts: 175
Joined: Wed Aug 19, 2020 11:22 am
Location: Dorset UK

Re: Intermittent ignition fault

Post by Red Gauntlet »

Check your headlamp switch plugs, sometimes they become loose and cause problems. Also if it is already 12v put a Boyer ignition kit in it, super easy to fit and you will be amazed at the difference in performance.
well oiled
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Posts: 7
Joined: Sun Sep 27, 2020 5:08 pm
Location: Bristol UK

Re: Intermittent ignition fault

Post by well oiled »

I had an internal fault inside the ammeter, making and breaking contact at random, causing odd starting and running problems. This type of problem can be eliminated as a possibility by connecting both ammeter leads to one post taking the ammeter out of the circuit temporarily.
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