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CB750 F2 oil

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Bryanj:
Yes its common, there is an oil stopper in the oil pump supposedley to stop this but frequently it seeps and oil drains down.
If you leave it a long time drain the sump into a clean container and put it back in the tank, if the tank still has a reasonable amount in it just run the bike and observe the level in tank.

DO NOT fill the tank up then run it or you will get a large oily mess

K2-K6:
My experience has never to be affected by draining down when stopped on a 750. They seem to be very reliable and effective without interference.

Some provisos, that the leak valve is in good condition and bike reasonably used fairly regularly.

Its properly engineered and placed, sits after pump head to always keep that primed, on its way to entering main crankcase gallery towards filter housing.  If it leaks, then it has to go through the pump, filter, galleries and out the crank bearings to drip down into the sump via that route. Its doesn't have a completely and gushing "incontinence" potential, that of dumping all the oil as soon as you've turned your back.

I dont say it doesn't happen, but correctly functioning then its reliable. I'd not introduce an additional valve to cover off something that does work reliablly.

There's definitely a risk with manual valve that I feel is significantly above the correctly operating std system. Same as you noted, with horror stories of people forgetting to open an oil "tap" on various installation.

Assessment, just check oil level when stopping and again after its stood, say overnight, then make a considered evaluation of existing system. The pump is very easy to work on if there's need to inspect and service the valve if there's a problem.

A mild "settling" after sitting will just be picked up by the scavenge side with not much to worry about.

archmill:
Again, thanks guy's. Will constantly keep my eye on the oil level before starting after sitting for a while.

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