Spark Plug Application Charts
Motor Cycle Chart No 2

Motor Cycles - Douglas to James

Manufacturer Model / hp Spark Plug
Manufacturer Model / hp Spark Plug
Douglas 350cc MkV Dragonfly L-10S Greeves 25R 25D 250cc Anzani L-10S
Douglas 350cc Competition Model L-10S Greeves 197cc Villiers L-11S
Douglas 350cc 80+ 90+ L-11S Greeves 325cc Fleetmaster L-10S
Dunelt ---- L-10 Guzzi Galletto-Airone N J-8
E.M.C. 125cc JAP Engine L-10 Guzzi Airone Sports, Falcone L-11S
---- ---- ---- Guzzi Astorre, Super Alce J-8
E.M.C. 350cc NA-8 Guzzi Aldetta Egretta Airone 17
E.M.C. 125cc RR LA-11 Guzzi PE 250S, V, GTV 17
E.M.C. - Puch 125cc 250cc L-10 Guzzi Alce GTW 16
Excelsior C1,2,3 TT1 TT2 TT3 STT1 STT2 NA-8 Guzzi Moto-Chassis R 3-Wheeler 16
Excelsior V1 V2 U1 D12 Condex L-10 Harley-Davidson 14mm fitting H-10
Excelsior R1 R2 F4 R4 R5 L-11S Harley-Davidson 18mm fitting 17
Excelsior 500cc Speedway Eng LA-15 H.J.H. 125cc Villiers L-10S
Excelsior 125cc J0 16 H.J.H. 197cc Villiers L-11S
Excelsior 148cc J1 JD1 7 Com L Horex 200cc S2 300cc S3 17
Excelsior 247cc J4 JD4 7 Com L Husqvarna 120cc 17
Francis-Barnett 125cc 16 Husqvarna Side Valve 17
Francis-Barnett 148cc 249cc 7 Com L Husqvarna OHV 18mm fitting 17
Francis-Barnett 125cc 52 53 57 Merlin L-10S Indian 14mm fitting except Brave J-6
Francis-Barnett 150cc Kestrel 69 Plover L-10S Indian 18mm fitting 17
Francis-Barnett Merlin 59 Falcon 60 LA-11 Indian Brave NA-8
Francis-Barnett Scrambles LA-14 James 125cc 18mm fitting 16
Gilera 125 Std 150-250 Sports L-10S James 148cc 18mm fitting 7 Com L
Gilera 500 VT Mercurio L-10S James 197cc 249cc 18mm fitting 16
Gilera 250 Std 500 Std 17 James 122cc Standard & DeLuxe L-10S
Gilera 500 Sports J-6 James Super-Lux, Commodore L-10S

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Motor Cycles - Douglas to James
Manufacturer	Model / hp	Spark Plug	Manufacturer	Model / hp	Spark Plug
Douglas	350cc MkV Dragonfly	L-10S	Greeves	25R 25D 250cc Anzani	L-10S
Douglas	350cc Competition Model	L-10S	Greeves	197cc Villiers	L-11S
Douglas	350cc 80+ 90+	L-11S	Greeves	325cc Fleetmaster	L-10S
Dunelt	----	L-10	Guzzi	Galletto-Airone N	J-8
E.M.C.	125cc JAP Engine	L-10	Guzzi	Airone Sports, Falcone	L-11S
----	----	----	Guzzi	Astorre, Super Alce	J-8
E.M.C.	350cc	NA-8	Guzzi	Aldetta Egretta Airone	17
E.M.C.	125cc RR	LA-11	Guzzi	PE 250S, V, GTV	17
E.M.C. - Puch	125cc 250cc	L-10	Guzzi	Alce GTW	16
Excelsior	C1,2,3 TT1 TT2 TT3 STT1 STT2	NA-8	Guzzi	Moto-Chassis R 3-Wheeler	16
Excelsior	V1 V2 U1 D12 Condex	L-10	Harley-Davidson	14mm fitting	H-10
Excelsior	R1 R2 F4 R4 R5	L-11S	Harley-Davidson	18mm fitting	17
Excelsior	500cc Speedway Eng	LA-15	H.J.H.	125cc Villiers	L-10S
Excelsior	125cc J0	16	H.J.H.	197cc Villiers	L-11S
Excelsior	148cc J1 JD1	7 Com L	Horex	200cc S2 300cc S3	17
Excelsior	247cc J4 JD4	7 Com L	Husqvarna	120cc	17
Francis-Barnett	125cc	16	Husqvarna	Side Valve	17
Francis-Barnett	148cc 249cc	7 Com L	Husqvarna	OHV 18mm fitting	17
Francis-Barnett	125cc 52 53 57 Merlin	L-10S	Indian	14mm fitting except Brave	J-6
Francis-Barnett	150cc Kestrel 69 Plover	L-10S	Indian	18mm fitting	17
Francis-Barnett	Merlin 59 Falcon 60	LA-11	Indian	Brave	NA-8
Francis-Barnett	Scrambles	LA-14	James	125cc 18mm fitting	16
Gilera	125 Std 150-250 Sports	L-10S	James	148cc 18mm fitting	7 Com L
Gilera	500 VT Mercurio	L-10S	James	197cc 249cc 18mm fitting	16
Gilera	250 Std 500 Std	17	James	122cc Standard & DeLuxe	L-10S
Gilera	500 Sports	J-6	James	Super-Lux, Commodore	L-10S