Topic: Oil light immediately after running

[Sething]

My oil pressure light turns off when running but turns on immediately after turning off the engine. Any ideas why it’s not holding pressure after running?



Honda 1977 CB750K

[bryanj]

Doesnt mean its not holding pressure, which only happens for a second or two anyway, but could be switch operating pressure altered with age

[Sething]

It is a new aftermarket switch. I could put the old one back in because I don’t think anything is wrong with it. (I originally thought it was broken but was due to a different issue). but it’s a pain in the ass under those carbs.


Honda 1977 CB750K

[bryanj]

Frequently aftermarket ones are car ones that fit and car ones definately work at different pressures, as long as its off when running everything should be ok

[Sething]

This puts me more at ease. Thank you!

[PeWe]

That's is normal for me, both my CB750's lit oil warning almost direct at ign off.
Oil pressure gauge is a good modification that will show how the pump works and oil  behavior that will change when really hot. Visible when riding, just a quick look now and then.
If oil pressure will lit/flicker at idle when engine is really warm, invest in new rotors as forum member MessnerMoto has done and sell.
http://forums.sohc4.net/index.php/topic,173081.0.html

[Sething]

Good to know about the rotors. I was considering a pressure gauge if I became too worried.


Honda 1977 CB750K

[pushin9s]

Slightly different animal, but my 350F oil light comes on pretty quick after stopping the engine.  I just turn it off with the key switch so I don't worry about it anymore. 
(Oil light used to flicker then come on steady at idle after only 15-20 minutes of riding.  Replaced the OEM switch with one from 4into1 and it stays off anytime the engine is running.)