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i'm curious as to when you guys with dry sump motors check your oil. i've read check it after its been running so it doesn't leak past the check valve into the crankcase and you get a truer reading. i tried this and i'm reading rather low. almost a qt. it wasn't low a few weeks ago and it doesn't leak. so i don't want to over fill it. where is the check valve on my cb750 anyway? in the oil tank or the hose?
 

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I would check the oil while the motor is running - and is warm.
Worst case you overfill it alittle and it will puke/dump outta the overflow. Just make sure this doesnt happen while u are riding (could be bad)..

ProTeal55
Member: Ton-Up Club Chicago
1972 CB750 Hooligan/Street Fighter -4 SALE !
1974 CB/CL450 Cafe/Bar/Stripclub Racer - 4 SALE !
1955 Chevrolet Bel-Air Hardtop
 

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if your tank stays filled when cold then your check valve is fine and check it when cold. If the oil tank is draining out when cold then check it warm.

The reason you don't check while it is warm is that the oil will still be in the top end and has not drained back fully and give you a low reading. If you over fill the oil pressure will spike and you gasket life will decrease. I check my 1975 cb750K dead cold and it never fails to be full.
 
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