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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
spark plugs
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<blockquote data-quote="Tom Gaynor" data-source="post: 15552" data-attributes="member: 4034"><p>NGK's recommendation for Rapides, Shadows, and Lightnings (and the single equivalents) is the BP6 - I have an obsolete NGK plugs booklet which gives recommendations for every old bike known to man. Grade 6 plugs are recommended for virtually everything. However if your plugs are oily, and you don't want a rebore and new valveguides just yet, a twin will run all day on the hotter BP5, which is hot enough to burn the oil off. (I've since bitten the bullet so have reverted to 6's again.</p><p>Caveat: I've been using NGK since 1974 with no problems. In the last 5 years I've had 5 fail, 4 of them in the last 2 years, all BP6 type, and all four almost new - mostly 2 or 300 miles. The last one was yesterday, after about 50 miles. It still has shiny plating on the thread.</p></blockquote><p></p>
[QUOTE="Tom Gaynor, post: 15552, member: 4034"] NGK's recommendation for Rapides, Shadows, and Lightnings (and the single equivalents) is the BP6 - I have an obsolete NGK plugs booklet which gives recommendations for every old bike known to man. Grade 6 plugs are recommended for virtually everything. However if your plugs are oily, and you don't want a rebore and new valveguides just yet, a twin will run all day on the hotter BP5, which is hot enough to burn the oil off. (I've since bitten the bullet so have reverted to 6's again. Caveat: I've been using NGK since 1974 with no problems. In the last 5 years I've had 5 fail, 4 of them in the last 2 years, all BP6 type, and all four almost new - mostly 2 or 300 miles. The last one was yesterday, after about 50 miles. It still has shiny plating on the thread. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
spark plugs
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