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Originally Posted by SteveNZ
As far as I know, the breather hoses .......I'm no mechanic, so I might have completely the wrong idea.
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That's about the size of it!
The amount of blowby varies with speed and load and exactly how the ring-pack was developed, but it'll be somewhere in the region of 10 lts/min as a ballpark figure. However with a V-twin there is a very large pulse effect due to the pistons' motion and the breather hoses will see big flow reversals every revolution.
Without a properly functioning separator you'll probably see a much higher oil consumption (loss through the breather).
The blowby is in essence exhaust gas but with some oil mist and fuel vapour thrown in for good measure, which is what you can smell. Legally the breather gas must be "consumed" (as manufactured), and in the UK I suspect it could be a Construction&Use infringement strictly speaking to have an open breather on a machine which didn't have it originally (going back a long time for that!), and I would guess a potential MOT failure
if it was picked up by the Tester. You may have similar regs in NZ.
Whatever the legal issues, it's not really recommended to run with an open breather for road use anyway.
I don't know what the induction kit you're referring to looks like, but some way of incorporating the separator arrangement from the standard airbox might be advisable.