spark plug grade

[Signboy]

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 ??

[muskrat]

G'day Signboy.
Yes, yes.
http://www.ebay.co.uk/itm/Spark-Plugs-Champion-L5-/320792073636?hash=item4ab0b295a4:g:bu4AAOSwq7JT6Vxy
or NGK B7HS http://www.ebay.co.uk/itm/1x-NGK-Copper-Core-Spark-Plug-B7HS-5110-/320891505952?hash=item4ab69fcd20:g:W0cAAOSwDk5T6U2G
Cheers

[Greybeard]

I've just bought these. I hope they are OK. Seem to be equivalent to Champion L5
http://www.ebay.co.uk/itm/141910561206

[Signboy]

cheers guys...... just found out they should be Champion L7s    are these hotter or cooler than the L5s ?   which ones do i go for ?

[muskrat]

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

[Signboy]

cheers pal