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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Blocked fuel cap vents
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<blockquote data-quote="peterg" data-source="post: 17626" data-attributes="member: 446"><p><strong>Plugged: relationship of air to fuel volume</strong></p><p></p><p>Howdy Chaps,</p><p> </p><p>If you've truly got a restricted/plugged fuel cap it will resort to misbehaving much sooner with the cap back in place the more fuel you have in that tank as liquid is not readily compressible or in this case expandable as plain atmosphere is.</p><p> </p><p>I'd just gotten my basket case Shadow back on the road, few test miles with partial fuel load, ran great. Met one morning to go on a 200 miler with a local classic bike club and filled it to the base of the neck and made sure that cap was on tight. Within 5 miles it was running on one pot under load. Pulled to the roadside thinking a jet plugged and commenced to remove the jet block, to the accompanyment of a faint treblish whistle which subsided during this delicate operation. Five or so miles later, same scenario, this time I disturbed the cap and there was a mild rush of air: engine heat, once stopped on this chilly day had heated the small air cavity, expanding it, thus the whistle. Correspondingly, drawing a vacuum when chilled, once underway. </p><p> </p><p>In a nut shell, I had to crack the cap less frequently the more fuel had burned off so subsequently only filled the tank half way each time to get home.</p></blockquote><p></p>
[QUOTE="peterg, post: 17626, member: 446"] [b]Plugged: relationship of air to fuel volume[/b] Howdy Chaps, If you've truly got a restricted/plugged fuel cap it will resort to misbehaving much sooner with the cap back in place the more fuel you have in that tank as liquid is not readily compressible or in this case expandable as plain atmosphere is. I'd just gotten my basket case Shadow back on the road, few test miles with partial fuel load, ran great. Met one morning to go on a 200 miler with a local classic bike club and filled it to the base of the neck and made sure that cap was on tight. Within 5 miles it was running on one pot under load. Pulled to the roadside thinking a jet plugged and commenced to remove the jet block, to the accompanyment of a faint treblish whistle which subsided during this delicate operation. Five or so miles later, same scenario, this time I disturbed the cap and there was a mild rush of air: engine heat, once stopped on this chilly day had heated the small air cavity, expanding it, thus the whistle. Correspondingly, drawing a vacuum when chilled, once underway. In a nut shell, I had to crack the cap less frequently the more fuel had burned off so subsequently only filled the tank half way each time to get home. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Blocked fuel cap vents
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