amal concentric carburator

Information relating to the Matchless G2 or AJS Model 14 250cc Lightweight
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maxim jurgens
Posts: 4
Joined: Fri May 01, 2020 11:23 am
Location: Thailand

amal concentric carburator

Post by maxim jurgens »

My AJS 250 CSR came with a newish Amal concentric . I know this is not the "correct " carb as it originally would have had a mono bloc.
According to the previous owner the carb was ordered from Amal "correctly jetted for an ajs 250 CSR.
The bike runs but not as well as it should . Spark plug gets very black too.
Does any one run their's on a concentric and if so what jet sizes and needle positions do you use ?
Many thanks for you help
Maxim Jurgens
Phuket, Thailand
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