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Author Topic: CB750 oil won't drain completely  (Read 1834 times)

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Offline lawhat

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CB750 oil won't drain completely
« on: December 21, 2011, 08:51:40 PM »
78 CB750 oil doesn't come out as expected. Even with some kicks on the starter with the drain plug out, plenty of oil in the reservoir without any more oil flowing out.
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Offline Spanner 1

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Re: CB750 oil won't drain completely
« Reply #1 on: December 21, 2011, 08:56:43 PM »
Hey man... do you have a manual for your bike?  Have you taken off the right-hand side cover yet ?
Under the r/h sidecover ( the one that covers the oil tank ) you will see that the oil tank has it's own drain plug  ;)
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Offline lawhat

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Re: CB750 oil won't drain completely
« Reply #2 on: December 22, 2011, 09:25:15 PM »
Just picked up a manual, and now realize that I'll need to drain from both the pan and the reservoir.

Any tips on making it a faster oil change? Any way to drain from one plug?
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Offline 754

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Re: CB750 oil won't drain completely
« Reply #3 on: December 22, 2011, 09:28:16 PM »
 Actually 3 places, tank, pan, and filter..
 
 Faster way..get a Honda twin....
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Offline ekpent

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Re: CB750 oil won't drain completely
« Reply #4 on: December 23, 2011, 07:40:08 AM »
I have also noticed that when draining the oil from the 750 engine a lot of oil is still 'trapped' inside the engine if done off the centerstand only.You will be surprised at how much more dirty stuff will drain out if you tip it very far to the left and right for a short bit and hold it then set it straight again. gets the old oil out of some trapped areas.  ;)
« Last Edit: December 23, 2011, 03:03:35 PM by ekpent »
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Offline lucky

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Re: CB750 oil won't drain completely
« Reply #5 on: December 23, 2011, 11:21:42 AM »
It is a DRY SUMP oil system.  Just like some race cars and airplanes.

Oil is NOT stored in the engine. It is stored  in the oil tank.
Helps cut down on the crankshaft drag in a conventional oil pan.
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Offline lawhat

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Re: CB750 oil won't drain completely
« Reply #6 on: December 27, 2011, 05:19:10 PM »
If I'm replacing the oil pan, can I do without draining the reservoir while working on it?
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bollingball

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Re: CB750 oil won't drain completely
« Reply #7 on: December 27, 2011, 06:01:06 PM »
Sure you can. But why?

                                   Ken
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Offline lawhat

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Re: CB750 oil won't drain completely
« Reply #8 on: December 27, 2011, 06:03:01 PM »
Partly laziness, and so I don't have to drain new oil and either dispose of it or recollect it.
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Offline phil71

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Re: CB750 oil won't drain completely
« Reply #9 on: December 27, 2011, 07:40:39 PM »
This thread is making only some sense. Taking the pan off is the opposite of laziness.
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Offline lawhat

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Re: CB750 oil won't drain completely
« Reply #10 on: December 27, 2011, 07:49:26 PM »
Replacing the oil pan is more of a necessity. It seems that it has been tapped out more than once, so I figured I'd pay the $30 for a better pan with good threads and a smaller hole (that I may have to tap again someday).
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