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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Breathers, can anyone help.
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<blockquote data-quote="timetraveller" data-source="post: 56697" data-attributes="member: 456"><p>At least one mistake is having one breather plus the timed breather. The one on the rear cap is sucking in air when the pistons are going up and the timed one should be shut trying to make a slight vacuum. One or the other but not both. I would remove the rear one, make sure that the timed one is open when the pistons are going down and closed when they are going up (checked by blowing down the timed breather tube when you know where the pistons are). If that does not do it then check these pages for details about some small plastic breather valve that some people have found useful.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 56697, member: 456"] At least one mistake is having one breather plus the timed breather. The one on the rear cap is sucking in air when the pistons are going up and the timed one should be shut trying to make a slight vacuum. One or the other but not both. I would remove the rear one, make sure that the timed one is open when the pistons are going down and closed when they are going up (checked by blowing down the timed breather tube when you know where the pistons are). If that does not do it then check these pages for details about some small plastic breather valve that some people have found useful. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Breathers, can anyone help.
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