Sparking plug choices

maylar · Apr 11, 2010

I've been using Champion N7YC plugs for my 850 forever, and seem to need replacements yearly. What alternatives are there that work well?

swooshdave · Apr 11, 2010

What kind of ignition?

Davehilliard · Apr 11, 2010

Hi

I have Boyer Brandsen Electronic ignition and I fitted it in 1979 I have no trouble with it and find that NGK plugs are the best. Just find the ones that match the Champion ones, my bike is away from me at moment but will let you know the ones I use if you want . I tried special ones for electronic ignition but they were useless.

Regards

Dave

swooshdave · Apr 11, 2010

BP7ES

Flo · Apr 11, 2010

Lodge
(sorry, out of date a bit)

mikegray660 · Apr 11, 2010

maylar said:
I've been using Champion N7YC plugs for my 850 forever, and seem to need replacements yearly. What alternatives are there that work well?

and the problem is? $6 a year don't seem to bad 2 me?

swooshdave · Apr 11, 2010

mikegray660 said:
maylar said:

I've been using Champion N7YC plugs for my 850 forever, and seem to need replacements yearly. What alternatives are there that work well?

Click to expand...

and the problem is? $6 a year don't seem to bad 2 me?

Maybe he only rides once a year. :mrgreen:

mikegray660 · Apr 11, 2010

swooshdave said:
mikegray660 said:

maylar said:

I've been using Champion N7YC plugs for my 850 forever, and seem to need replacements yearly. What alternatives are there that work well?

Click to expand...

and the problem is? $6 a year don't seem to bad 2 me?

Click to expand...

Maybe he only rides once a year. :mrgreen:

then i think i know why his plugs are going bad! :shock: (i like autolite -AP63 platinum $2.89 - - and yes they go bad about once a year, usually at startup after winter - w/ about 5K miles)

ML · Apr 11, 2010

NGK Irridium. Pricey but never had a problem, 40,000Kms on the same pair, 25 year old analogue Boyer.

Mick

BillT · Apr 11, 2010

How do the plugs go bad?

As long as the electrode and insulator are in good shape (not cracked or missing), just clean and re-gap?

When these bikes were new, most garages had little sandblasters for sparkplugs that cleaned off carbon buildup in about 15 seconds. Plugs were replaced when the insulator cracked or the electrode was too worn to properly gap.

BrianK · Apr 11, 2010

Plus one one the fine-wire Iridiums. Originally put them in pre-reringing, to eke out some miles before replacing some worn rings - they resist fouling MUCH better than other plugs - but have kept them in post new rings as they're such great plugs. Run them in all my bikes nowadays - placebo effect? - it's possible, but I like them.

swooshdave · Apr 11, 2010

BillT said:
How do the plugs go bad?

As long as the electrode and insulator are in good shape (not cracked or missing), just clean and re-gap?

When these bikes were new, most garages had little sandblasters for sparkplugs that cleaned off carbon buildup in about 15 seconds. Plugs were replaced when the insulator cracked or the electrode was too worn to properly gap.

http://www.harborfreight.com/cpi/ctaf/d ... mber=32860

Have mine bolted to my bike bench.

bpatton · Apr 11, 2010

BrianK said:
Plus one one the fine-wire Iridiums. Originally put them in pre-reringing, to eke out some miles before replacing some worn rings - they resist fouling MUCH better than other plugs - but have kept them in post new rings as they're such great plugs. Run them in all my bikes nowadays - placebo effect? - it's possible, but I like them.

Mick, Brian, which NGK plug are you using, coils? Thanks.

MarshalNorton · Apr 11, 2010

orig set up points 6 volt coils/condensers.
Use NGK BP7ES w/ amal 932's stock again.
750 cc 10:1 compression.
No problems in 1400 miles.
Took out and inspected at 600 miles.
A nice lite tan on ceramic insulator.
I may change next year as heat is hell on everything.
And for $5.00 a pair it's cheap piece of mind.
Marshal

maylar · Apr 12, 2010

ML said:
NGK Irridium. Pricey but never had a problem, 40,000Kms on the same pair, 25 year old analogue Boyer.

Mick

Got a part number for those?

(i like autolite -AP63 platinum $2.89 - - and yes they go bad about once a year, usually at startup after winter - w/ about 5K miles)

Which is where I'm at right now. Hard starting after the Winter. I can deal with once a year replacement, but I'd like to try something more reliable.

swooshdave · Apr 12, 2010

BPR7EIX

http://www.ngksparkplugs.com/part_finde ... p?mode=nml

Madnorton · Apr 12, 2010

I run Boyer with standard coils, and use the NGK Iridiums. The bike will start with just a lazy kick when it's been left for a few weeks when I have been at sea, never spits backs and does not fire and die - if it fires it will just carry on whereas in the past it used to be 2 or 3 kicks with the odd pop or fire and die then need another kick. I came across them when a Vincent owner suggested them as they seem to work better with a MAG, as they will give a good spark on less volts.

ML · Apr 12, 2010

bpatton said:
BrianK said:

Plus one one the fine-wire Iridiums. Originally put them in pre-reringing, to eke out some miles before replacing some worn rings - they resist fouling MUCH better than other plugs - but have kept them in post new rings as they're such great plugs. Run them in all my bikes nowadays - placebo effect? - it's possible, but I like them.

Click to expand...

Mick, Brian, which NGK plug are you using, coils? Thanks.

NGK Irridium are BPR6EIX, and I run German made PVL 6V coils, copper wire HT leads, NGK caps and the original analogue Boyer.

Mick

BrianK · Apr 12, 2010

Mine are Denso IW-22.

Danno · Apr 12, 2010

ML said:
NGK Irridium. Pricey but never had a problem, 40,000Kms on the same pair, 25 year old analogue Boyer.

Mick

I have a set of these to screw in once initial tuning for the SS pipes and megs (which I don''t have yet) is done on the Champ 7Y's. I used to love the Champ N4G Gold Palladium plugs, but I don't think they're available anymore. Hope the Iridiums do as well or beter.