BSA spark plug guidance table. This table will give you the original spark plug number code, the gap of the plugs & the modern day equivalent spark plugs from Champion & NGK.
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BSA Spark Plug Guide. |
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Model |
Original |
Champion |
NGK |
Gap |
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D1 - 1954 |
L10 |
L86C |
B6HS |
0.020" |
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D1 - 1954 onwards |
L7 |
L82C |
B6HS |
0.020" |
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D3, D5, D7 |
L7 |
L82C |
B6HS |
0.020" |
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D10, D14/4, D14/4S |
N4 |
N4C |
B7ES |
0.020" |
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A7, A10GF |
L7 |
L82C |
B6HS |
0.020" |
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A7SS, A10RGS |
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A10RR, A10SR |
N4 |
N4C |
B7ES |
0.020" |
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A50, A50C, A50CC |
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A65, A65LC, A65R |
N4 |
N4C |
B7ES |
0.020" |
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A65T |
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A65SS |
N3 |
N3C |
B8ES |
0.020" |
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B25 Starfire |
N3 |
N3C |
B8ES |
0.020" |
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B31, B33 |
L7 |
L82C |
B6HS |
0.020" |
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B32 cast iron head |
L7 |
L82C |
B6HS |
0.020" |
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B32 Alloy Head |
N4 |
N4C |
B7ES |
0.020" |
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B32GS, B40 |
N5 |
N5C |
B6ES |
0.020" |
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B34 cast iron head |
L7 |
L82C |
B6HS |
0.020" |
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B34 Alloy head |
N5 |
N5C |
B6ES |
0.020" |
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B34GS Clubmans : |
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Competition |
N57R |
C57R |
B10EG |
0.016" |
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Road use |
N3 |
N3C |
B8ES |
0.020" |
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Scrambler |
N3 |
N3C |
B8ES |
0.020" |
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Gold Star Racer : |
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Competition |
N54R |
C55R |
B10EG |
0.016" |
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Road use |
N3 |
N3C |
B8ES |
0.020" |
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B40SS90, Victor B44R |
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B44SS |
N4 |
N4C |
B7ES |
0.020" |
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Victor B44ET, B44GP, |
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B44VS |
N4 |
N4C |
B7ES |
0.020" |
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C10L |
N8 |
N5C |
B6ES |
0.020" |
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C12 |
L7 |
L82C |
B6HS |
0.020" |
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C15, C15T |
N5 |
N5C |
B6ES |
0.020" |
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C15S, C25 |
N3 |
N3C |
B8ES |
0.020" |
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C15SS80 |
N4 |
N4C |
B7ES |
0.020" |
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M21 Cast iron head |
L10 |
L86C |
B6HS |
0.020" |
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M21 Alloy head |
N8 |
N5C |
B6ES |
0.020" |
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M33 |
L7 |
L82C |
B6HS |
0.020" |
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Rocket 3 |
N3 |
N3C |
B8ES |
0.020" |