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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: 103232" data-attributes="member: 2907"><p>I have 10 motorcycles. I have only had the crank pin (crankshaft out) on 6 of them. Anyway that standard of ownership was Roberts not mine. When you have had the whole bike apart it does give you a certain mastery that you can only have that way. Anyway it will be really interesting to hear if some of you get some positive results from this. It makes sense in theory and I have tried it and it works. It may not make a noticeable difference on a bike that is already working well. When I first did it I was hoping it would stop the leak from my decompressor mechanism, it didn't. In the end to stop that I installed an additional spring to put more compression on the rubber, that stopped it. I think my bike probably drips more oil than some of the ones with the standard breather set up, but I think the leaks I have have little to do with the breather. Last year the problem I had was with my McDougalator leaking! Also until I put in the Cometic gasket my primary leaked. I do get some white emulsified oil dripping out of my breather when I park the bike. I notice very little oil consumption at all. I like the idea of a reed valve breather. Jim Comstock did experiments on Nortons with different reed valve and timed breathers using a very high speed pressure sensor attached to an oscilloscope. From that he designed a few different reed valve breathers for Nortons. Probably you can't do any better than what he has done.</p></blockquote><p></p>
[QUOTE="Nigel Spaxman, post: 103232, member: 2907"] I have 10 motorcycles. I have only had the crank pin (crankshaft out) on 6 of them. Anyway that standard of ownership was Roberts not mine. When you have had the whole bike apart it does give you a certain mastery that you can only have that way. Anyway it will be really interesting to hear if some of you get some positive results from this. It makes sense in theory and I have tried it and it works. It may not make a noticeable difference on a bike that is already working well. When I first did it I was hoping it would stop the leak from my decompressor mechanism, it didn't. In the end to stop that I installed an additional spring to put more compression on the rubber, that stopped it. I think my bike probably drips more oil than some of the ones with the standard breather set up, but I think the leaks I have have little to do with the breather. Last year the problem I had was with my McDougalator leaking! Also until I put in the Cometic gasket my primary leaked. I do get some white emulsified oil dripping out of my breather when I park the bike. I notice very little oil consumption at all. I like the idea of a reed valve breather. Jim Comstock did experiments on Nortons with different reed valve and timed breathers using a very high speed pressure sensor attached to an oscilloscope. From that he designed a few different reed valve breathers for Nortons. Probably you can't do any better than what he has done. [/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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