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AJS/M 1-CILINDER ZUIGERS
A note on GPM pistons: the size indicated is the bore size of the barrel. GPM pistons are slightly undersize to this bore. If you race the bike or put it to heavy use the bore may be a touch bigger. Also use SAE50 oil.
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PISTON 350CC 1949 UP

ZM350
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Make "GNP". Old stock.  Complete with rings and circlips

PISTON AJS/MATCHLESS 500CC SINGLE

ZJP680
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1949 up 500cc singles (BIG CYLINDER HEAD)
Compression ratio 7.2:1
Compression height 46.03mm
Made by JP in Australia

CS 500 PISTON

ZGPM862A
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All in weight 717gr. for the STD size, so you'll have to grind some flesh away.

350CC PISTON > 1949

ZGPM6920
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350CC PISTON 1949 UP

ZGPM6916
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GPM pistons are slightly undersize to the nominal bore.

PISTON EARLY 350

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New old stock. Various makes.
These will ONLY fit 1940-1948 models. (SMALL CYLINDER HEAD)
Only a few available

PISTON RINGS 500CC SINGLE

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Please state size