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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet badly tuned or just underpowered?
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<blockquote data-quote="gwild" data-source="post: 22616" data-attributes="member: 242"><p>Dear all,</p><p>Thanks to many helpful people on and off the forum my basketcase Comet goes, and even stops nicely.</p><p>I wondered if I could call upon the collective wisdom of the forum to help me with a little question of tuning:-</p><p></p><p>Riding last Sunday though it was having problems. With my little experience I worry whether it was just bad luck or something more drastic. Here are the symptoms:</p><p></p><p>Riding two-up from Oxford to Henley (not particularly far nor hilly) the bike seemed unwilling to travel faster than 50 mph in fourth gear. If I opened the throttle further a noise like a small hammer striking metal at quite high frequency was emitted.</p><p>As the hills got longer I was forced to decrease speed and gears further until the bike would not go without the noise. At the top of Gangsdown Hill I cut the engine and let it cool for 20 minutes whereupon it was difficult to start (starts first kick when cold, always harder when warm).</p><p>Worried about missing an appointment I swapped plugs and proceeded the remainder of the journey under 40 mph, and returned alone.</p><p></p><p>Further observations:</p><p>- The day was the hottest this year, but this is still March in the UK so not above 20 degrees C</p><p>- I've noticed when accelerating (solo) from standstill if I open the throttle too far too fast I get a similar hammering noise. This stops if I open the throttle at a slower pace to match engine speed.</p><p></p><p>As this is my only motorised conveyance</p><p>1. Are all Comets this slow when two- up? (I'll think about buying a twin some time after I get my first proper job!)</p><p>2. If not a) is this something I should be worried about or to b) ignore and get on with it</p><p></p><p>If 2. a) as I am fearing, what would be a logical set of tests to find and cure the problem? There are so many variables I don't really know where to start.</p><p></p><p>thanks very much in anticipation, </p><p></p><p>gwild</p><p></p><p>1952ish C Comet with stock carb, magneto and dynamo, 12v electrics and camouflaged modern rectifier</p></blockquote><p></p>
[QUOTE="gwild, post: 22616, member: 242"] Dear all, Thanks to many helpful people on and off the forum my basketcase Comet goes, and even stops nicely. I wondered if I could call upon the collective wisdom of the forum to help me with a little question of tuning:- Riding last Sunday though it was having problems. With my little experience I worry whether it was just bad luck or something more drastic. Here are the symptoms: Riding two-up from Oxford to Henley (not particularly far nor hilly) the bike seemed unwilling to travel faster than 50 mph in fourth gear. If I opened the throttle further a noise like a small hammer striking metal at quite high frequency was emitted. As the hills got longer I was forced to decrease speed and gears further until the bike would not go without the noise. At the top of Gangsdown Hill I cut the engine and let it cool for 20 minutes whereupon it was difficult to start (starts first kick when cold, always harder when warm). Worried about missing an appointment I swapped plugs and proceeded the remainder of the journey under 40 mph, and returned alone. Further observations: - The day was the hottest this year, but this is still March in the UK so not above 20 degrees C - I've noticed when accelerating (solo) from standstill if I open the throttle too far too fast I get a similar hammering noise. This stops if I open the throttle at a slower pace to match engine speed. As this is my only motorised conveyance 1. Are all Comets this slow when two- up? (I'll think about buying a twin some time after I get my first proper job!) 2. If not a) is this something I should be worried about or to b) ignore and get on with it If 2. a) as I am fearing, what would be a logical set of tests to find and cure the problem? There are so many variables I don't really know where to start. thanks very much in anticipation, gwild 1952ish C Comet with stock carb, magneto and dynamo, 12v electrics and camouflaged modern rectifier [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet badly tuned or just underpowered?
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