Spark Plug confusion

[Smithgd]

Id try the B6ES NKG's.
Champian plugs are crap IMO. I had one come apart in my Gold Star, and almost holed my gas tank. That was my last Champ. Be sure you have good Lucas brushes in your mag. I inadvertantly got a set of Asian repros in my mag. They were too soft, and left carbon tracks on the Ring, resulted in poor/eratic running. Engine Eventually stopped. Took me a month to figure that one out.

[LJ.]

BTW are you the LJ mentioned in RC this last month?

Yes I am! and staying with the writer Graham Ham & family this very Thursday for an early start to the John Bull rally this weekend. I've not yet read the mag though, should I take a big boxing glove?

Seriously... Graham is a great chap and inspired me to do the Round Britain Rally twice. I expect you might have read his brilliant book 'Daiseys  Diaries'... Well worth a read.

http://www.realclassic.co.uk/books/books05072900.html

[Apologise to Andy M for hacking his thread!]

[peter49]

Hi Andy, I had serious problems with my A10 failing on one or both cylinders when I used Champion plugs, i switched to using NGK plugs, and at the same time put  a fuelcat into the petrol tank, and have not had a problem with plugs failing in the last 500 miles.

[groily]

Sounds as if there are good and bad plugs of all makes to me. I've been running (the same) Bosch plugs in my (ironhead) A10 for over 20,000 miles and they're still better than fine, another of the same in my B31 and that's fine too, NGK B6/7/8s or Champion 5/4/3 in other things with alloy heads, and, yup, one or two very rare glitches. But that's in loadsa miles. I'm not big on changing plugs unless they've eaten their electrodes or are otherwise messed up, which usually says something else isn't how it ought to be. Sometimes I've found 'plug failure' is advance warning of a magneto (or other ignition) fault - but replacing the much-maligned two-buck item gets you home at least.
Dunno what a fuel cat is Peter, but if it's tin pellets in a canister or something I'd say it was probably snake oil, like those so-called spark boosters that wreck HT pickups and eventually destroy HT windings . . . Hope you're able to stuff a couple of noughts on the mileage to get proof out of that particular pudding!