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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Big Bore Comet
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<blockquote data-quote="DucATIRadeon" data-source="post: 176326" data-attributes="member: 5456"><p>perhaps (way) out of context but couldn't help noticing this reply as the RE Bullet is identical bore x stoke as the Vin:</p><p>my RE bullet 500 (now with 87mm bore giving 535cc) with standard cams (30-60-75-35 timing, 7.8mm valve lift) does over 5000rpm in 4th doing 100+mph....sitting upright!</p><p>std primary gearing, 4th gear 1:1, 19/38 final gearing with 19" rear wheel.</p><p>valves are now 1.875" (47.6mm) inlet and 44mm exhaust, head ported by ABSAF (The Netherlands), 32mm dellorto and Sachse electronic ignition (8 degrees BTDC static, 34 degrees max advance). did 25hp/47Nm with the original valves, now doing 28hp/50Nm ish.</p><p>crank is balanced to 60% (best value according PEI and ABSAF road going racers).</p><p></p><p>so, The Comet having "better" cams and more valve lift, I wonder why your 600cc+ Comet isn't outperforming my agricultural Enfield??</p><p>mind you, my Bullet is from 2002 yet mechanically/design wise indistinguishable from the older '56 design when it moved from UK to India...</p><p>If I were to make another mod to my Bullet, it be a larger stroke (106mm if possible otherwise 103mm) and heavier crank (following Egli).</p><p></p><p>would you happen to know why your Comet isn't going above 4500rpm?</p><p>just curious...</p></blockquote><p></p>
[QUOTE="DucATIRadeon, post: 176326, member: 5456"] perhaps (way) out of context but couldn't help noticing this reply as the RE Bullet is identical bore x stoke as the Vin: my RE bullet 500 (now with 87mm bore giving 535cc) with standard cams (30-60-75-35 timing, 7.8mm valve lift) does over 5000rpm in 4th doing 100+mph....sitting upright! std primary gearing, 4th gear 1:1, 19/38 final gearing with 19" rear wheel. valves are now 1.875" (47.6mm) inlet and 44mm exhaust, head ported by ABSAF (The Netherlands), 32mm dellorto and Sachse electronic ignition (8 degrees BTDC static, 34 degrees max advance). did 25hp/47Nm with the original valves, now doing 28hp/50Nm ish. crank is balanced to 60% (best value according PEI and ABSAF road going racers). so, The Comet having "better" cams and more valve lift, I wonder why your 600cc+ Comet isn't outperforming my agricultural Enfield?? mind you, my Bullet is from 2002 yet mechanically/design wise indistinguishable from the older '56 design when it moved from UK to India... If I were to make another mod to my Bullet, it be a larger stroke (106mm if possible otherwise 103mm) and heavier crank (following Egli). would you happen to know why your Comet isn't going above 4500rpm? just curious... [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Big Bore Comet
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