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Author Topic: Oil breather end  (Read 1272 times)

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Offline _mark

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Oil breather end
« on: September 06, 2016, 02:22:47 AM »
Hi guys, my bike (four 750 k1) is leaking oil from chain and spreading it all over the back of the bike in great quantity.

After investigations (i checked also the automatic oil greaser), I found that probably the reason is the breather (is this the correct name?) of the engine head cover.





Where is advisable to put the end of this?

Because the chain could be a good place since the leake is little, but if I make an elongation of the pipe, this will lead to go the wheel and that is not nice.

Is it normal that the breather is going to leak a lot with hot temperatures? my oil is Motul 5100 15w50 4T

« Last Edit: September 06, 2016, 02:25:18 AM by _mark »
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Offline flybox1

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Re: Oil breather end
« Reply #1 on: September 06, 2016, 07:01:01 AM »
It is not oil.  It is crank case vapor condensate, and it should drain on the right side of your bike, near the swing-arm pivot.
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

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Offline _mark

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Re: Oil breather end
« Reply #2 on: September 06, 2016, 12:36:13 PM »
Quote from: flybox1 on September 06, 2016, 07:01:01 AM
It is not oil.  It is crank case vapor condensate, and it should drain on the right side of your bike, near the swing-arm pivot.
Thanks. Is there a rule for the side and position of all drains? Thanks.
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Offline flybox1

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Re: Oil breather end
« Reply #3 on: September 06, 2016, 12:42:34 PM »
Most all are on the right side, including the carb overflows...
The 550 i just finished had a small wire holder to keep all tubes off to the right side of the tire...
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline Duke McDukiedook

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Re: Oil breather end
« Reply #4 on: September 06, 2016, 01:48:41 PM »
If you have not plugged the auto chain oiler that is probably the bigger source of your oil leak.
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Offline _mark

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Re: Oil breather end
« Reply #5 on: September 06, 2016, 07:17:04 PM »
Quote from: DukieDukenDuke on September 06, 2016, 01:48:41 PM
If you have not plugged the auto chain oiler that is probably the bigger source of your oil leak.
As I wrote in the first message, I plugged it.
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