Plug type poll.

[Reynard24]

'55 G80S - NGK B7ES, '60 G12DL - NGK B7ES, '63 G3 - NGK B8ES, '63 G15/45 - B7ES, '64 M18 - NGK B7ES, '65 G15MKII - BP6ES

All alloy heads.

[Harry44]

Has anyone tried extended electrode such as the Champion N9Y in the singles ?
It looks like there's room and they're supposed to give better combustion by starting the fire closer to the centre of the combustion chamber.

[Rob Harknett]

Has anyone tried extended electrode such as the Champion N9Y in the singles ?
It looks like there's room and they're supposed to give better combustion by starting the fire closer to the centre of the combustion chamber.

Perhaps this needs to be a new topic.

[Rob Harknett]

Forum page no.3 results now listed. As my file is Excel, this time I am showing it sorted first via plug type. This will show which plug is most popular.

Plugs used pol 3.pdf

[Rob Harknett]

The question of what plug to use with todays fuels often arises. We have nothing in tech tips on the subject. So I have said I would try and conduct a poll. Then make a file for guidance. We do need a lot of response to make this successful.
Please reply stating your bike year and model and the plug you are satisfied works OK, even if the said plug is that which was recommended in the workshop manual. Please try and keep replies to that underlined above.

[clive]

sorry Rob FE80 has worked well on my G80L

[Rob Harknett]

sorry Rob FE80 has worked well on my G80L

What year engine Clive? As there has been a comment about iron head and alloy head, plug reach differs. So really do need to state year of engine.

[Yak]

1947 G3L, NGK B6HS

[ajsm18]

Mark can you check that, your '47 AJS should have an iron head and use short reach plugs, B6HS, or B7HS.
Cheers Dave.

Yep, sorry B6HS or B7HS both used successfully. Iron, coil spring head (i.e. standard)

[PGGuse]

IMG_9371.JPG

1965 AJS road model 18: NGK BPR7EIX
(plug blameless - oil ring broken )