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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
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<blockquote data-quote="Tom Gaynor" data-source="post: 8169" data-attributes="member: 4034"><p><strong>Lost compression</strong></p><p></p><p>Put your thumb over the plug holes, and kick it over.</p><p></p><p>My bike wasn't going very well at a Scottish camping weekend. So I retimed, and it went much better. On the way home however, it clearly wasn't right, so I took the timing cover off (no, when I got home, not by leaning over on the move). The front inlet pushrod had jumped out, jammed itself and the cam follower in the only place that the motor wouldn't be wrecked, and such that enough mixture would get in to the front pot (valve off seat...) to keep it firing. </p><p></p><p>Jesus: does a Vincent Shadow with two fully functional cylinders GO! Having replaced the new, bent, pushrod with one of the old ones, I spent the next hour thrashing it up and down the road thinking WOW! This is what they're SUPPOSED to be like. It really WOULD cruise at the ton, if I didn't need my license.</p><p></p><p>Be lucky.</p><p></p><p>(The club shadow developed about 13 hp (exaggeration for dramatic effect only) as standard. To get it to go with modern fuel it was dramatically weakened. This bumped the hp up three-fold. (If my memory is correct, and that's possible, ignition timing was not particularly critical.) So the chances you've holed a piston aren't zero, but they're slim. The bad news is that this can only really be checked on a serious (i.e. not Dynajet) brake with an exhaust sniffer.) </p><p></p><p>Tom</p></blockquote><p></p>
[QUOTE="Tom Gaynor, post: 8169, member: 4034"] [b]Lost compression[/b] Put your thumb over the plug holes, and kick it over. My bike wasn't going very well at a Scottish camping weekend. So I retimed, and it went much better. On the way home however, it clearly wasn't right, so I took the timing cover off (no, when I got home, not by leaning over on the move). The front inlet pushrod had jumped out, jammed itself and the cam follower in the only place that the motor wouldn't be wrecked, and such that enough mixture would get in to the front pot (valve off seat...) to keep it firing. Jesus: does a Vincent Shadow with two fully functional cylinders GO! Having replaced the new, bent, pushrod with one of the old ones, I spent the next hour thrashing it up and down the road thinking WOW! This is what they're SUPPOSED to be like. It really WOULD cruise at the ton, if I didn't need my license. Be lucky. (The club shadow developed about 13 hp (exaggeration for dramatic effect only) as standard. To get it to go with modern fuel it was dramatically weakened. This bumped the hp up three-fold. (If my memory is correct, and that's possible, ignition timing was not particularly critical.) So the chances you've holed a piston aren't zero, but they're slim. The bad news is that this can only really be checked on a serious (i.e. not Dynajet) brake with an exhaust sniffer.) Tom [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
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