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AJS/M SINGLE PISTONS
!

350CC PISTON 1949 UP
ZGPM6916
!
GPM pistons are slightly undersize to the nominal bore.

350CC PISTON > 1949
ZGPM6920
!

CYLINDER LINER 350cc
ZGPM6920
!

Inner diameter 69mm, length 162mm.
Only a few left.

CS 500 PISTON
ZGPM862A
!

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

GENUINE WELLWORTHY +020 PISTON EARLY 350
WP339
!
New old stock, still covered in grease.
These will ONLY fit 1940-1948 models. (SMALL CYLINDER HEAD)
Only a few available

PISTON AJS/MATCHLESS 500CC SINGLE
ZJP680
!
1949 up 500cc singles (BIG CYLINDER HEAD)
Compression ratio 7.2:1
Compression height 46.03mm
Made by JP in Australia