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MG Midget and Sprite Technical - spark plugs

'evening chaps....so, tonight's conundrum...1275 12CC series engine...recommended plugs are Champion N9Y gapped at 25 thou [6.5mm]...I have some NGK BP6E fitted which I gapped the same so it came as a bit of a revelation to find that on the NGK website the recommended gap for these is 8 mm [a gnat's whisker over 30 thou]. Any wise heads out there with a comment?
Cheers, Dave
David Cox

ooop..that should be 0.65 mm !
David Cox

I suspect misprints:

6.5mm is 1/4" or thereabouts - that's some spark plug gap, and as for 8mm!

My BL workshop manual gives 24 thou to 26 thou as 0.610mm to 0.660mm for Champion N9Y.

I think you'll find the NGK website recommends 0.8mm for the gap, and that's 31 thou.

Colin
C Mee

With points I’d stick with .025. Maybe .030 for a true electronic ignition set up.

John Payne

David - you posted while I was typing!

Apologies if you'd already spotted it!

C
C Mee

no worries, Colin! yep....special spark plugs 2 feet long! Damn metric measurements!....
David Cox

..more research on the NGK site gives 0.6 mm gap for BP6ES [which they also claim are replacements for Champion N9YCs...]. Dave
David Cox

You could also use BP6E and with my 123 fully electronic dissy it was found best by Peter to gap at 28 thou (0.7112mm).

25 thou = 0.635mm by Google.
Nigel Atkins

This thread was discussed between 14/02/2020 and 15/02/2020

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