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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Elephant trunk breather
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<blockquote data-quote="greg brillus" data-source="post: 99820" data-attributes="member: 597"><p>From someone who works on these bikes, I can say that i am not a fan, although i can see they do work well. From my experience you only need a more sizable breather if you intend on pushing the engine regularly past 80 plus MPH. Having said that, on the twin racer I built, I only used a larger bore timed stock breather that vents into the kickstart cover that is sealed in its lower half to the G50 plate and a couple of extra holes drilled to vent up near the hole where the clutch cable passes through. My road going Rapide uses a breather type inspection cap atop the front cylinder exhaust valve with a 3/8" bore hose running to the rear axle. If the bores and rings are in good condition and the heads seal well without using excessive amounts of torque on the head stud nuts, oh and use 3 mm "O" rings on the pushrod tubes instead of the stock type, you will have minimal oil leaks. Again I can see that folk might like to use them, and It is a shame the factory did not make the breather much better. But I have never used the elephant's trunk type breathers on any of the engines I have done.......To each his own.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 99820, member: 597"] From someone who works on these bikes, I can say that i am not a fan, although i can see they do work well. From my experience you only need a more sizable breather if you intend on pushing the engine regularly past 80 plus MPH. Having said that, on the twin racer I built, I only used a larger bore timed stock breather that vents into the kickstart cover that is sealed in its lower half to the G50 plate and a couple of extra holes drilled to vent up near the hole where the clutch cable passes through. My road going Rapide uses a breather type inspection cap atop the front cylinder exhaust valve with a 3/8" bore hose running to the rear axle. If the bores and rings are in good condition and the heads seal well without using excessive amounts of torque on the head stud nuts, oh and use 3 mm "O" rings on the pushrod tubes instead of the stock type, you will have minimal oil leaks. Again I can see that folk might like to use them, and It is a shame the factory did not make the breather much better. But I have never used the elephant's trunk type breathers on any of the engines I have done.......To each his own. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Elephant trunk breather
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