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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Eight Stroking/Rich Mixture/Black Smoke
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<blockquote data-quote="A_HRD" data-source="post: 4713" data-attributes="member: 49"><p><strong>8 Stroking</strong></p><p></p><p>Ken,</p><p></p><p>Hmm, you seem to have done it all. The final act of substituting for a another pair of carbs - with the same result leads me to think beyond carburation - and beyond ignition too from what you've said. Is there any chance that you've had a small slippage of a cam in its pinion thus screwing-up the valve timing? If not, my final act would be to change to Amals and if it still happens, then swap mags (and HT leads/caps) out of desperation. </p><p></p><p>I am with you entirely on the non-use of NGKs - particlarly with magnetos. I have very few ignition problems with my bikes - but all those I have had in the last 15 years have been when I've relented to peer pressure and purchased NGKs. One wouldn't spark from the day I bought it, another lasted 3 miles, another lasted 200 - it got me to Dover but then gave me heartahe trying to get on the car ferry on one cylinder... Refit any old 2nd-hand plug of another make and it starts and runs like a dream hot or cold. I overheard a couple BSA/Norton guys at an Autojumble last week having the same discussion - both had similar experiences with NGKs. </p><p></p><p>Regards,</p><p></p><p>Peter Barker</p><p>Bristol, Uk</p></blockquote><p></p>
[QUOTE="A_HRD, post: 4713, member: 49"] [b]8 Stroking[/b] Ken, Hmm, you seem to have done it all. The final act of substituting for a another pair of carbs - with the same result leads me to think beyond carburation - and beyond ignition too from what you've said. Is there any chance that you've had a small slippage of a cam in its pinion thus screwing-up the valve timing? If not, my final act would be to change to Amals and if it still happens, then swap mags (and HT leads/caps) out of desperation. I am with you entirely on the non-use of NGKs - particlarly with magnetos. I have very few ignition problems with my bikes - but all those I have had in the last 15 years have been when I've relented to peer pressure and purchased NGKs. One wouldn't spark from the day I bought it, another lasted 3 miles, another lasted 200 - it got me to Dover but then gave me heartahe trying to get on the car ferry on one cylinder... Refit any old 2nd-hand plug of another make and it starts and runs like a dream hot or cold. I overheard a couple BSA/Norton guys at an Autojumble last week having the same discussion - both had similar experiences with NGKs. Regards, Peter Barker Bristol, Uk [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Eight Stroking/Rich Mixture/Black Smoke
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