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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Big Bore Comet
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<blockquote data-quote="greg brillus" data-source="post: 176337" data-attributes="member: 597"><p>My single 665 race engine (92 x 100) last run on the dyno put out just over 50 RWHP That was with the old piston that had lowish comp ratio.......after that we installed a hand finished piston somewhere above 15:1 (on methanol ), then I set about fine tuning the fueling to lean it off and the power difference was noticeable.......No racing this year so far, as loads of time spent making up roller followers and special one off cam to suit, plus all the time spent getting the replica Grey Flash ready for Goodwood. I am hopeful to see figures upward of 60 but this could be dreaming a bit, but it all looks promising so far. A good road Comet with a 600 kit, Mk 2 cam and 36 mm Mikuni or Dellorto will see around 35 on a good day. It really transforms the bikes, and I tell folk that if the factory could have made them like this, they probably wouldn't have sold as many twins.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 176337, member: 597"] My single 665 race engine (92 x 100) last run on the dyno put out just over 50 RWHP That was with the old piston that had lowish comp ratio.......after that we installed a hand finished piston somewhere above 15:1 (on methanol ), then I set about fine tuning the fueling to lean it off and the power difference was noticeable.......No racing this year so far, as loads of time spent making up roller followers and special one off cam to suit, plus all the time spent getting the replica Grey Flash ready for Goodwood. I am hopeful to see figures upward of 60 but this could be dreaming a bit, but it all looks promising so far. A good road Comet with a 600 kit, Mk 2 cam and 36 mm Mikuni or Dellorto will see around 35 on a good day. It really transforms the bikes, and I tell folk that if the factory could have made them like this, they probably wouldn't have sold as many twins. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Big Bore Comet
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