I also think a 7 heat range is better for the way most Triumphs are ridden.But I have used 8's in some Triumphs and there were no complaints.... I use NGK B8EG in our LSR Triumph.I don't know if the fine wire G plug is the same exact heat range as a S plug...But plug reading said it was the perfect heat range for this 10.5 compression engine running wide open on 107 octane leaded racing fuel.
650 Triumph modified production LSR record holder 133.1 MPH... Twin 650 engine Triumph LSR that goes sorta fast...
This has been answered before but I can't find it. I need new plugs and Champion N3's are hard to find locally. Crossover chart says NGK B8ES but memory says this is wrong. Clarification please and thanks!
I never worried a great deal about plugs but I just took the bike in for a re-bore and was shamed when the shop pointed out I had old, odd plugs; one was an offering by General Motors.
So I got two new NGK B7ES. Today I took the bike in for it's MOT test. Shamed again, when the examiner said it was running on one cylinder. Sure enough he was right, one of the new plugs had failed totally.
I thought plugs were simple things, what would cause one to fail? Could it be brought back to life (scientific interest only, its going in the bin) ?
That young man was Kenelm Lee Guinness, of the brewing family, and he was, in his own words, "mad about racing". While studying at Cambridge University he had acted as mechanic to his older brother, Sir Algernon Guinness. Upon leaving Cambridge, Kenelm had taken up racing on his own account and found a home for his racing sable in some outbuildings at an old disused inn called The Bald Faced Stag at Putney Lane on the London to Portsmouth road.
Never heard of that brand before but a good story nonetheless.
Doug, Do you check for the correct gap before you put them in and do you use a socket specifically designed for spark plug installation? The wrong gap or cracked porcelain will do them in. If another new plug fails it's symptom of other problems.
1968 T120R 1972 T120RV Any advice given is without a warranty expressed or implied.