Spark Plug Application Charts
Motor Cycle Chart No 3

Motor Cycles - James to O.K. Supreme

Manufacturer Model / hp Spark Plug
Manufacturer Model / hp Spark Plug
James Comet, Cadet L-10S Montesa Brio 80 125cc Sport L-11S
James Captain, Colonel, L-11S Montesa Brio 90 125cc L-11S
James Commando, Cotswold L-11S New Imperial All 14mm fitting L-10S
J.A. Prestwich 350cc OHV Grass Racing Engines LA-14 New Imperial All 18mm fitting 16
J.A. Prestwich 500cc OHV Speedway LA-14 New Map ---- H-10
J.A. Prestwich 8-80 1000cc Twin OHV Dry Sump LA-15 Nimbus ---- L-10
J.A. Prestwich 8-80 1000cc Twin OHV Wet Sump LA14 Norman 125cc 18mm fitting 8 Com
J.A. Prestwich 500cc OHV Racing Mk1 LA-15 Norman 125cc 98cc 242cc 142cc L-10S
J.A. Prestwich 1000cc OHV Twin Mk1 Racing LA-15 Norman 150cc L-10S
J.A. Prestwich 1100cc OHV Twin Mk1 Racing LA-15 Norman 197cc L-11S
J.A. Prestwich 250cc 350cc Racing 1953 NA-14 Norton All Side Valve 18mm fitting 16
J.A. Prestwich 500cc Racing Type 7 & 8 1952-3 LA-14 / 15 Norton Model 16H Side Valve 500cc NA-8
Jawa 500cc J-8 Norton Big Four 596cc Side Valve NA-8
Jawa 14mm to 1954 Models L-10 Norton Model 18 490cc OHV L-10S
Jawa 18mm fitting 7 Norton ES2, 88, 7, Cast Iron Head L-10S
Jawa 125cc 150cc 250cc 350cc 1954-on L-10S Norton ES2, 88, 7, 99 Ali Head NA-8
Matchless Side Valve Models 18mm 7 Norton 30M, 40m 3/4" reach plug NA-19
Matchless Side Valve Models 14mm L-10 Norton 19R, 19S, 50, 500T NA-8
Matchless OHV Models 18mm fitting 16 N.S.U. 98cc Fox, Max, SuperFox L-11S
Matchless 1946 350cc L-10 N.S.U. 123cc Fox, Lux L-10S
Matchless 1946 500cc L-10S O.E.C. 18mm fitting 16
Matchless 1947-49 all Cast Iron head Models L-10S O.E.C. 125cc L-10S
Matchless 1950 onwards all Ali head Models NA-8 O.E.C. 197cc L-11S
Matchless G45 Racing Single NA-12 / 14 O.E.C. 250cc Apollo NA-8
Mobylux 123cc L-10 O.K. Supreme Sidevalve Models 7
Montesa Brio 80 125cc L-10S O.K. Supreme OHV & OHC 14mm fitting L-10S

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Motor Cycles - James to O.K. Supreme
Manufacturer	Model / hp	Spark Plug	Manufacturer	Model / hp	Spark Plug
James	Comet, Cadet	L-10S	Montesa	Brio 80 125cc Sport	L-11S
James	Captain, Colonel,	L-11S	Montesa	Brio 90 125cc	L-11S
James	Commando, Cotswold	L-11S	New Imperial	All 14mm fitting	L-10S
J.A. Prestwich	350cc OHV Grass Racing Engines	LA-14	New Imperial	All 18mm fitting	16
J.A. Prestwich	500cc OHV Speedway	LA-14	New Map	----	H-10
J.A. Prestwich 8-80	1000cc Twin OHV Dry Sump	LA-15	Nimbus	----	L-10
J.A. Prestwich 8-80	1000cc Twin OHV Wet Sump	LA14	Norman	125cc 18mm fitting	8 Com
J.A. Prestwich	500cc OHV Racing Mk1	LA-15	Norman	125cc 98cc 242cc 142cc	L-10S
J.A. Prestwich	1000cc OHV Twin Mk1 Racing	LA-15	Norman	150cc	L-10S
J.A. Prestwich	1100cc OHV Twin Mk1 Racing	LA-15	Norman	197cc	L-11S
J.A. Prestwich	250cc 350cc Racing 1953	NA-14	Norton	All Side Valve 18mm fitting	16
J.A. Prestwich	500cc Racing Type 7 & 8 1952-3	LA-14 / 15	Norton	Model 16H Side Valve 500cc	NA-8
Jawa	500cc	J-8	Norton	Big Four 596cc Side Valve	NA-8
Jawa	14mm to 1954 Models	L-10	Norton	Model 18 490cc OHV	L-10S
Jawa	18mm fitting	7	Norton	ES2, 88, 7, Cast Iron Head	L-10S
Jawa	125cc 150cc 250cc 350cc 1954-on	L-10S	Norton	ES2, 88, 7, 99 Ali Head	NA-8
Matchless	Side Valve Models 18mm	7	Norton	30M, 40m 3/4" reach plug	NA-19
Matchless	Side Valve Models 14mm	L-10	Norton	19R, 19S, 50, 500T	NA-8
Matchless	OHV Models 18mm fitting	16	N.S.U.	98cc Fox, Max, SuperFox	L-11S
Matchless	1946 350cc	L-10	N.S.U.	123cc Fox, Lux	L-10S
Matchless	1946 500cc	L-10S	O.E.C.	18mm fitting	16
Matchless	1947-49 all Cast Iron head Models	L-10S	O.E.C.	125cc	L-10S
Matchless	1950 onwards all Ali head Models	NA-8	O.E.C.	197cc	L-11S
Matchless	G45 Racing Single	NA-12 / 14	O.E.C.	250cc Apollo	NA-8
Mobylux	123cc	L-10	O.K. Supreme	Sidevalve Models	7
Montesa	Brio 80 125cc	L-10S	O.K. Supreme	OHV & OHC 14mm fitting	L-10S