Over the winter I rebuilt the motor on my cb750K5. 836 kit off of ebay, under cut gears from cycleX (was jumping out of second), MLS head gasket, all new gaskets and seals. I was amazed that it fired right up!
I adjusted the cam chain, reset the timing, and balanced the carbs.
Then upon its first ride the oil light started to come on after it warmed up. Crap!
So, I pulled the pump and replaced the o-rings, something I neglected to do before. I also went with 20w-50 oil and a new filter. Sill, once it warmed up the oil light would come on. Crap!!!
So, I started reading, and of course all the worse case scenarios haunted me. But, first things first. Get an oil pressure gauge on there.
I order a 100 psi 1 3/8 diameter, 1/8 npi gauge off of eBay, $15. Got it in the mail yesterday.
Went to the local hardware store, got a 90 degree brass fitting, a tap and drill bit.
Pulled the oil gally plug above the points cover, put it in the vice with some wood blocks as to not damage it.
Drilled a small hole to start.
Then the 11/32 hole.
A little tapping oil, my tap holder was too small so I had to improvise, and nice and slow, tapped the hole.
De-burred it and cleaned it up a bit. Plus a little teflon tape and a new o-ring for the cap,
Mount it back up.
Fired the bike up, and got about 70 psi. But that wasn't the problem, once it was warmed up the the light would go on.
Took her for a short test ride to get her warmed up. Sure enough the light started to flicker. But Good News! I have oil pressure!