Can’t get G80 to tick over

Information relating to the Matchless G80 or AJS Model 18 500cc Heavyweight.
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AndyO
Posts: 16
Joined: Mon Oct 26, 2020 5:24 pm
Location: Gloucestershire UK

Can’t get G80 to tick over

Post by AndyO »

My 54 G80S, bought recently, keeps “surging” when trying to establish tickover. Original carb abandoned in favour of a concentric Mk1
Starts ok but won't settle down. Using the adjuster in the cable and slide stop screw I can get a tickover then it will start to get faster all by itself. More adjustments result in cutting out.
Any ideas?
Andy
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clive
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Posts: 5657
Joined: Mon Jan 01, 1990 12:00 am
Location: LONDON UK

Re: Can’t get G80 to tick over

Post by clive »

Is it a new concentric? Symptoms sound like a worn slide allowing air round the side.
clive
if it ain't broke don't fix
Mick D
Posts: 2886
Joined: Mon Mar 24, 2014 5:44 pm
Location: Aberdeenshire

Re: Can’t get G80 to tick over

Post by Mick D »

Hi

I think you need to adjust the air screw - work through this guide:

http://amalcarb.co.uk/downloadfiles/ama ... d_Tips.pdf

Regards Mick
56G80S
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Joined: Wed Oct 12, 2005 10:45 pm
Location: N YORKS UK

Re: Can’t get G80 to tick over

Post by 56G80S »

I think, Clive is right. It's the symptom I experienced with the Concentric that I wore out. New "correct" carb from AMOC spares and all good. No amount of adjustment would get the worn out Concentric to tick over.

Johnny B
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