CB750 with 836 kit leaking oil into exhaust

[swbass1]

'73 750 with an 836 kit and web cam.  ran good for about a year.  oil pressure started to drop after a good half hour ride.  now the pressue is non existant.  cylinder 4 is burning oil and leaking into exhaust.  compression on all cylinders is good.  i had a feeling there was a bad valve guide seal leaking oil onto the exhaust valve and into the clinder while at the same itme in the exhaust header.  now i am thinking there is a clog in one of the returns from the head causing the leak into the cylinder and fouling the plug.  Bike runs like a champ with clean plug (minus the lack of pressure).  once i park it the plug fouls imediatly.

any insight would be helpful.

[TOOLS1]

If oil is getting into the cylinder, you must have low compression. I would re-do the compression test, or do a leakdown test. Either way, you are going to have to do some top end work.
TOOLS