The BSA A7-A10 Forum

Technical (Descriptive Topic Titles - Stay on Topic) => Lucas, Ignition, Charging, Electrical => Topic started by: Nomad54 on 30.04. 2025 23:59

Title: Which plugs to use
Post by: Nomad54 on 30.04. 2025 23:59

I am rebuilding my 1963 ex police a10. Unfortunately the iron head was to damaged to use so I purchased an alloy head to fit. I need some advice on which spark plugs to use. I know I need to fit long reach plugs but which make and grade would be best. I am using low comp pistons 7.5/1.
Tom

Title: Re: Which plugs to use
Post by: CheeserBeezer on 01.05. 2025 06:32

Champion N4C, NGK B7ES are recommended. I use these in alloy heads.

Title: Re: Which plugs to use
Post by: bikerjohndavies on 01.05. 2025 07:43

I think Andrew meant Champion N4C

Title: Re: Which plugs to use
Post by: CheeserBeezer on 01.05. 2025 07:57

Quote from: bikerjohndavies on 01.05. 2025 07:43

I think Andrew meant Champion N4C

Thank you!

Title: Re: Which plugs to use
Post by: Slymo on 09.06. 2025 03:25

Quote from: CheeserBeezer on 01.05. 2025 06:32

Champion N4C, NGK B7ES are recommended. I use these in alloy heads.

I have one of each in mine. The insulator broke on one N4 for no discernable reason on a long trip about four years ago and I could only buy the NGK. So far haven't found a need to replace them :)

Title: Re: Which plugs to use
Post by: sean on 09.06. 2025 03:52

if you have a problem finding the N4C plugs try a small engine shop they still use them