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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin spark heads
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<blockquote data-quote="Comet Rider" data-source="post: 7010" data-attributes="member: 36"><p><strong>Sparks and exhaust ports</strong></p><p></p><p>Hi Paul,</p><p>Firstly there is a member in Milton Keynes who offers a reclamation service for the exhaust port. He mahines out the damaged thread, and puts in a bronze insert, thus retaining a standard nut<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" />.</p><p>The guy to contact is Roger Forsythe, AKA ROFOR Engineering.</p><p></p><p>With regard to twin sparks I have a different view to most, <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite9" alt=":eek:" title="Eek! :eek:" loading="lazy" data-shortname=":eek:" /> which would be to have your standard plug thread welded up, and re-machined for a 12mm plug, then put another 12mm plug on the other side. This means that you have more meat between the plug and the valve seats.<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /></p><p>Another point to note is that you will need to pull back your ignition timing as you will now have a much wider flame front in the combustion chamber. This can be as much as 10 deg's, but a rolling road will be able to help you fine tune this<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="Comet Rider, post: 7010, member: 36"] [b]Sparks and exhaust ports[/b] Hi Paul, Firstly there is a member in Milton Keynes who offers a reclamation service for the exhaust port. He mahines out the damaged thread, and puts in a bronze insert, thus retaining a standard nut:D. The guy to contact is Roger Forsythe, AKA ROFOR Engineering. With regard to twin sparks I have a different view to most, :o which would be to have your standard plug thread welded up, and re-machined for a 12mm plug, then put another 12mm plug on the other side. This means that you have more meat between the plug and the valve seats.;) Another point to note is that you will need to pull back your ignition timing as you will now have a much wider flame front in the combustion chamber. This can be as much as 10 deg's, but a rolling road will be able to help you fine tune this:) [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin spark heads
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