Author Topic: spark plug grade  (Read 550 times)

Offline Signboy

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spark plug grade
« on: 20.03. 2016 22:23 »
Hi Guys, me again,
Before there's a collective  groan on a subject thats been done to death.... i need to replace the plugs in both my iron head A7's  and wondered what the correct grade is,   both at present have Champion L5s in   but is this correct ? and can you still get them ??

Online muskrat

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'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
Australia
Muskys Plunger A7

Online Greybeard

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Re: spark plug grade
« Reply #2 on: 21.03. 2016 18:18 »
I've just bought these. I hope they are OK. Seem to be equivalent to Champion L5
http://www.ebay.co.uk/itm/141910561206

Offline Signboy

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Re: spark plug grade
« Reply #3 on: 21.03. 2016 19:08 »
cheers guys...... just found out they should be Champion L7s    are these hotter or cooler than the L5s ?   which ones do i go for ?

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Re: spark plug grade
« Reply #4 on: 21.03. 2016 19:27 »
G'day Signboy.
Champs and NGK run their heat range opposite. NGK B5HS is hotter than B8HS. Champs L5 is colder than L7.
A hot plug burns a rich mixture better when cold and on the choke BUT will be too hot at revs and normal temp.
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
Australia
Muskys Plunger A7

Offline Signboy

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Re: spark plug grade
« Reply #5 on: 21.03. 2016 22:45 »
cheers pal
 *smile*