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.
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Pulled the oil gally plug above the points cover, put it in the vice with some wood blocks as to not damage it.
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Drilled a small hole to start.
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Then the 11/32 hole.
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A little tapping oil, my tap holder was too small so I had to improvise, and nice and slow, tapped the hole.
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De-burred it and cleaned it up a bit. Plus a little teflon tape and a new o-ring for the cap,
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Mount it back up.
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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.
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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!