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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin spark heads
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<blockquote data-quote="ET43" data-source="post: 7058" data-attributes="member: 62"><p><strong>twin plug headfs</strong></p><p></p><p>For what it's worth, I've been running this set up for quite a few years, both on ordinary coil and now with a Lucas Rita system. With the coils I ran 10 degrees less than standard, found a lot more torque and a few less revs, but better fuel consumption. With the Rita set up, I had occasion to talk to John Carpenter at Mistral Engineering, who services this system, and he advised me that 10 degrees was a bit too much, saying that 6 degres was more like it. In passing he said that the only machine that they ran with 10 degrees less was a Kwacker 900. I suspect that Guzzis and Be-ems which run 10 degrees less on twin plugs, like the Vin, are not all that fussed about a few degrees, unless one is after the ultimate in performance, and then I guess it is off to a rolling road. I currently use BP7ES plugs. I have noticed that the original plug will retain it's colour, whilst the second plug will read weaker, and this has to be because the fuel mixture is directed at the original plug which then sweeps round to hit the other one, but in a diluted state if you see what I mean. Maybe there is a need for a diferent heat range for the second plug. I cannot give an answer for the setting of 6 degrees less as the blooming thing is once again apart awaiting reallignment of the flywheels, so watch this space.</p><p>Cheers,</p><p>Phil Primmer</p></blockquote><p></p>
[QUOTE="ET43, post: 7058, member: 62"] [b]twin plug headfs[/b] For what it's worth, I've been running this set up for quite a few years, both on ordinary coil and now with a Lucas Rita system. With the coils I ran 10 degrees less than standard, found a lot more torque and a few less revs, but better fuel consumption. With the Rita set up, I had occasion to talk to John Carpenter at Mistral Engineering, who services this system, and he advised me that 10 degrees was a bit too much, saying that 6 degres was more like it. In passing he said that the only machine that they ran with 10 degrees less was a Kwacker 900. I suspect that Guzzis and Be-ems which run 10 degrees less on twin plugs, like the Vin, are not all that fussed about a few degrees, unless one is after the ultimate in performance, and then I guess it is off to a rolling road. I currently use BP7ES plugs. I have noticed that the original plug will retain it's colour, whilst the second plug will read weaker, and this has to be because the fuel mixture is directed at the original plug which then sweeps round to hit the other one, but in a diluted state if you see what I mean. Maybe there is a need for a diferent heat range for the second plug. I cannot give an answer for the setting of 6 degrees less as the blooming thing is once again apart awaiting reallignment of the flywheels, so watch this space. Cheers, Phil Primmer [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin spark heads
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