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Author Topic: Cb750 oil venting from transmission breather  (Read 872 times)

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Offline terrorshark

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Cb750 oil venting from transmission breather
« on: January 23, 2018, 01:05:20 PM »
New top end. Head work, rings, gaskets all around.

Recently started venting oil from the trans breather. No Hoses from oil tank to trans breather. Is this the problem?  No oil venting from crank case breather just the trans breather.
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'72 Yamaha LS2
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'74 Honda CB550
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Offline slikwilli420

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Re: Cb750 oil venting from transmission breather
« Reply #1 on: January 23, 2018, 01:32:11 PM »
There should only be one breather tube on the cases on a stock CB750? Where is the other one you are talking about?
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All you gotta do is do what you gotta do.

Vintage Speed Parts Mashup: http://forums.sohc4.net/index.php?topic=133638.0
Rickman CR Parts Kit Refresh: http://forums.sohc4.net/index.php/topic,154837.0.html
AHRMA CB750 Racer: http://forums.sohc4.net/index.php/topic,158461.0.html
AHRMA Superbike Heavyweight Racer: http://forums.sohc4.net/index.php/topic,173120.0.html
'76F CB750 Patina Redemption: http://forums.sohc4.net/index.php/topic,174871.0.html

Offline terrorshark

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Re: Cb750 oil venting from transmission breather
« Reply #2 on: January 23, 2018, 01:38:10 PM »
Back of the motor above the transmission
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'68 MV Agusta Tevere Motocarro
'72 Yamaha LS2
'74 MV Agusta 350b
'74 Honda CB550
'77 MV Agusta 350 Ipotesi
'00 MV Agusta F4

Offline Henning

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Re: Cb750 oil venting from transmission breather
« Reply #3 on: January 23, 2018, 02:14:18 PM »
Quote from: terrorshark on January 23, 2018, 01:38:10 PM
Back of the motor above the transmission
...must be connected to the oil tank or else you can't expect it to work properly.
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71 or thereabouts 750 K1 - this one should have been put down
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