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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Breather Timing: A long description of a different way (Part 1)
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<blockquote data-quote="Nigel Spaxman" data-source="post: 103782" data-attributes="member: 2907"><p>The timing is set by blowing in a hose so the direction of the slot is taken into account. The angle of opening is the angle you read on a timing disk when the valve opens and closes (not the actual angle from vertical of the slot in the gear) I put my slot facing down because I missed the instructions about having it set pointing forwards. Down seemed the obvious way to me. The reason I set it pointing straight down was to promote the maximum drain back of oil through the valve. The factories idea was to have the slot pointing away from sources of oil to prevent oil being carried out with the air, that might be better, I would do it that way if I do it again. I doubt it makes much difference though as long as the slot is not pointed either up or straight back which probably would increase the amount of oil going out the breather. I think that if you really wanted to minimize the amount of oil going out of the timed breather the best thing would be to have a fairly large diameter breather pipe going straight up the front of the engine and then a smaller hose to the back of the bike. I didn't bother doing that because I think it would be ugly.</p></blockquote><p></p>
[QUOTE="Nigel Spaxman, post: 103782, member: 2907"] The timing is set by blowing in a hose so the direction of the slot is taken into account. The angle of opening is the angle you read on a timing disk when the valve opens and closes (not the actual angle from vertical of the slot in the gear) I put my slot facing down because I missed the instructions about having it set pointing forwards. Down seemed the obvious way to me. The reason I set it pointing straight down was to promote the maximum drain back of oil through the valve. The factories idea was to have the slot pointing away from sources of oil to prevent oil being carried out with the air, that might be better, I would do it that way if I do it again. I doubt it makes much difference though as long as the slot is not pointed either up or straight back which probably would increase the amount of oil going out the breather. I think that if you really wanted to minimize the amount of oil going out of the timed breather the best thing would be to have a fairly large diameter breather pipe going straight up the front of the engine and then a smaller hose to the back of the bike. I didn't bother doing that because I think it would be ugly. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Breather Timing: A long description of a different way (Part 1)
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