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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin Plug Heads - Better or No Difference?
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<blockquote data-quote="Marcus Bowden" data-source="post: 117509" data-attributes="member: 3287"><p>I've been on twin plugs since 1990 after the rebuild in France with Herve Hamon w<em>here drive side main bearing was sleaved and Honda oil pump fitted. Riding a lot of miles with Herve L'Manach before rebuild then after there were three to four litres difference when filling our fuel tanks, his "D" had an eighteen-litre tank and mine was 15 litres. Before the rebuild, I was calling the fuel stops, after he was calling for fuel stops. Like Stu said the ignition retarded by 10 or more degrees certainly makes a difference, not so much negative work before TDC. But twenty years later and 125k miles one of my double ended coils failed so it was all too retarded and a front exhaust valve seat dropped it, recued by Christine next day removed head parceled up to Bob Dunn as he did one for me before by return post. in afternoon took rear head off and piston had a 20 mm hole in it. So split cases and timing side fly wheel removed and rear B/End out board roller track was well Brinelled the other two rows were OK as well as the drive side B/end. so then it was nearly nide months before it was returned from Bob D. </em></p><p><em> Is it wise to twin plug!? I have now got switches to isolate each coil so can be tested whilst in motion to check.! </em></p><p><em> The "B" on route to 2017 annual rally up north at 220miles ran out of fuel so stoped (as one tends too with no fuel) put in my two 7 litre containers of fuel so nearly full tank and reached rally and had just switched over onto reserve about a mile before campsite. Originally the two small panniers where to be fuel tanks but only had pop riveter on ship during manufacture, 12 litre each side so that would be a total of 39 so well over 500 mile range but I think I should have done it in 1992 when the panniers were made. It all goes through a tweny eight inch doorway so can filter trafic with ease, must have left Stumpy Lord a few miles back on the home run but he caught uo eventually before parting company at M5. nice weather though.</em></p><p><em></em></p><p><em>[ATTACH=full]32712[/ATTACH]</em></p></blockquote><p></p>
[QUOTE="Marcus Bowden, post: 117509, member: 3287"] I've been on twin plugs since 1990 after the rebuild in France with Herve Hamon w[I]here drive side main bearing was sleaved and Honda oil pump fitted. Riding a lot of miles with Herve L'Manach before rebuild then after there were three to four litres difference when filling our fuel tanks, his "D" had an eighteen-litre tank and mine was 15 litres. Before the rebuild, I was calling the fuel stops, after he was calling for fuel stops. Like Stu said the ignition retarded by 10 or more degrees certainly makes a difference, not so much negative work before TDC. But twenty years later and 125k miles one of my double ended coils failed so it was all too retarded and a front exhaust valve seat dropped it, recued by Christine next day removed head parceled up to Bob Dunn as he did one for me before by return post. in afternoon took rear head off and piston had a 20 mm hole in it. So split cases and timing side fly wheel removed and rear B/End out board roller track was well Brinelled the other two rows were OK as well as the drive side B/end. so then it was nearly nide months before it was returned from Bob D. Is it wise to twin plug!? I have now got switches to isolate each coil so can be tested whilst in motion to check.! The "B" on route to 2017 annual rally up north at 220miles ran out of fuel so stoped (as one tends too with no fuel) put in my two 7 litre containers of fuel so nearly full tank and reached rally and had just switched over onto reserve about a mile before campsite. Originally the two small panniers where to be fuel tanks but only had pop riveter on ship during manufacture, 12 litre each side so that would be a total of 39 so well over 500 mile range but I think I should have done it in 1992 when the panniers were made. It all goes through a tweny eight inch doorway so can filter trafic with ease, must have left Stumpy Lord a few miles back on the home run but he caught uo eventually before parting company at M5. nice weather though. [ATTACH type="full"]32712[/ATTACH][/I] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin Plug Heads - Better or No Difference?
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