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October 29th, 2014, 04:02 PM   #91
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dunno Zaga

you'll have to buy one and let us know
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October 30th, 2014, 09:01 AM   #92
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ZAAGA
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November 12th, 2014, 09:45 AM   #93
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Way too small, only some 8mm...

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November 12th, 2014, 11:02 AM   #94
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Hmm, but after a few revolutions enough air has escaped to make the CC in a vacuum, would it not matter at that point that it's only 8mm id?
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November 12th, 2014, 12:20 PM   #95
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Certainly enough for the blow-by flow, but the pulse from the down moving piston needs to be vented too.
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November 12th, 2014, 01:15 PM   #96
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Yep. I installed a too small valve and blew the gasket in the top cover.
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November 13th, 2014, 02:42 PM   #97
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it does look too small .. thanks Dr_C

the thread says they were using it up to 540cc

FWIW this is my breather filter on my 700, car fuel filter, quite restrictive and the ID of the fittings is 8mm



I don't have any problems with excess pressures but i have 2 reed valves between the main crank cavity and the gearbox. where there are 2x 8mm holes in total.

on my "new" engined 628 there is so little blowby it is hard to discern any outward flow at all even at 7 - 8000 rpm, it also has the 2 reed valves.

Last edited by bushmechanic; November 13th, 2014 at 03:18 PM.
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November 13th, 2014, 03:49 PM   #98
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Originally Posted by Dr_C View Post
Way too small, only some 8mm...

Yep, I ordered one too . . . and immediately thought "there's no way this is gonna work". Ok, lesson learned, gonna find one Lineaweaver specified.
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November 13th, 2014, 09:01 PM   #99
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you might be surprised Goose

internally there are only 2 small holes between the engine crank case proper and the gearbox, on the older bikes there is only 1 hole .. its smaller than the ID of that valve

the ktm dudes reckon it works

once a vacuum is created there isn't any air with which to transmit any pressure waves. on both my bikes (running the crankcase proper under a vacuum rather than the whole engine) I find the crankshaft seals actually get sucked inward with such great force that I have to make special retaining lips to stop them being chewed up by the bearings.

Last edited by bushmechanic; November 13th, 2014 at 09:07 PM.
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November 14th, 2014, 08:46 AM   #100
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With my automotive check valve, on start-up I get a couple chuffs of air, then nothing. Even at high revs there is no air escaping asfaras I can tell.

There is no oil residue anywhere. Fwiw, I'm running 1100 ml of oil, (halfway up the sight glass cold)

A good way to test what's going on would be to put a ballon over the outlet, affix it with some tape then start it up.

If it's already warmed up, crack the oil filler to zero out the pressure first.
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