Originally fitted Champion L10 S (superceeded by L87YC), alternatives Bosch W8 AC (or W6 BC), KLG F70 (Water Proof – WF 70), AC 45F, recommend NGK BP5HS or Denso W16FP-U.
14mm ,1/2" Reach,13/16" Hex. Note the N9YC at 3/4" Reach is not suitable, as it may hit the valves and may run too hot being further into the hot gas.
Could try L82YC or BP6HS which is a cooler plug as NGK say going one level cooler will remove 100c from the cylinder head to the cooling system. Better for high speed motoring.
Read more:
If you suffer from plug fouling then get a hotter plug. (BP5) (L87YC) or even hotter L92YC but first fix your carburation!
If you have run-on etc then a cooler running plug may be better.(BP6) or (BP7) even cooler L78YC but first check your ignition and valve timing.
Note resistor versions for interference supression are available QXXXX refer tohere.
Sparking Plugs
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Keith Clements
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