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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Blocked fuel cap vents
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<blockquote data-quote="BigEd" data-source="post: 17620" data-attributes="member: 161"><p>A few years ago my brother was riding a vintage Sunbeam in the Banbury run and I was following him around the course. After a few miles The Sunbeam lost power and stopped. He suspected the magneto. (Classic hot magneto syndrome; it works until hot and then fails plus it is easy to blame the magneto as it can't defend itself unless you are holding the plug lead as you crank the engine.<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite9" alt=":eek:" title="Eek! :eek:" loading="lazy" data-shortname=":eek:" />) After a few minutes fiddling about and checking for a spark the engine started and ran OK ....... for a few more miles.</p><p>This occurred several times until eventually we realised that the petrol filler cap vent hole was being sealed by the route card in a plastic wallet that was taped to the top of the petrol tank. A few seconds work making a strategic hole through the card and wallet saw the Sunbeam running perfectly for the rest of the day. Each time we stopped the carburettor must have slowly filled with petrol again.</p><p>When using a tank bag on my Rapide I have a short piece of wood that sits on top of and across the petrol and oil filler caps leaving the two breather holes exposed. Another piece of wood with two concave sides )_( is screwed underneath the first piece of wood. This locates between the two caps and keeps things in place. Cheap and cheerful, a bit like myself. ;-)</p></blockquote><p></p>
[QUOTE="BigEd, post: 17620, member: 161"] A few years ago my brother was riding a vintage Sunbeam in the Banbury run and I was following him around the course. After a few miles The Sunbeam lost power and stopped. He suspected the magneto. (Classic hot magneto syndrome; it works until hot and then fails plus it is easy to blame the magneto as it can't defend itself unless you are holding the plug lead as you crank the engine.:eek:) After a few minutes fiddling about and checking for a spark the engine started and ran OK ....... for a few more miles. This occurred several times until eventually we realised that the petrol filler cap vent hole was being sealed by the route card in a plastic wallet that was taped to the top of the petrol tank. A few seconds work making a strategic hole through the card and wallet saw the Sunbeam running perfectly for the rest of the day. Each time we stopped the carburettor must have slowly filled with petrol again. When using a tank bag on my Rapide I have a short piece of wood that sits on top of and across the petrol and oil filler caps leaving the two breather holes exposed. Another piece of wood with two concave sides )_( is screwed underneath the first piece of wood. This locates between the two caps and keeps things in place. Cheap and cheerful, a bit like myself. ;-) [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Blocked fuel cap vents
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