mystery miss

Information relating to the Matchless G80 or AJS Model 18 500cc Heavyweight.
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Re: mystery miss

Postby SPRIDDLER » Thu Dec 10, 2020 10:57 pm

I've posted this before but obviously NGK found it necessary to issue this guide to identifying fake NGK plugs:
NGK fake plugs (640x398).jpg


Which reminds me ........
I bought a 1947 one owner Model 18 that hadn't run for 25 years. I recommissioned it and replaced the 'worn out' KLG FE80 plug with a nice new NGK. It was the devil of a job to start it. I changed it for a new Champion but still I knackered myself trying to start it. Lost for options and without touching anything else I put the worn out FE80 back in. It started easily and ran beautifully thereafter. Not at all scientific and I can't explain why it 'liked' the FE80 but it certainly did.
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Re: mystery miss

Postby 56G80S » Fri Dec 11, 2020 5:14 pm

Great post, Sprid.

Johnny B

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Re: mystery miss

Postby Trefor » Tue Dec 22, 2020 7:13 am

Just to complete the thread.
I tried the suggestions and did eventually solve the mystery. First was to stop the leak from the fiber washer between the jet holder and the carb. body (couldn't get a seal with washers so used O-ring). The needle was on the second from bottom notch, it had run perfectly for the last 10 years on that setting. I returned it to the middle notch. Finally fitted a Champion N5C and the miss was gone. Thanks again for the suggestions.

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