I tried for a month to find an in-stock Vesrah kit for a CB650K1 about a year ago, no luck. I ended up with the NE brand. The oil-feed holes were not centered very well, so I got thicker O-rings for those holes and trimmed away the part of the head gasket where it was sitting over the recess in the cylinders. When I pressed down the O-ring (with a piece of glass) to see how it would spread, it filled in all but a small part of the hole toward the middle of the deck.
After I bolted the head down, I discovered that it had 2 stripped-in-the-case holes for the bolts. So, I 'used up' the first head gasket for nuthin'...
Then I bought a standalone head gasket on eBay, and it was also an NE brand. It had the very same oil hole mislocation issue, so I did the same thing again (after I fixed the threads in the 2 holes in the cases), using O-rings that were 0.5mm thicker than the measured depth of the
[hole recess + new head gasket].
After I reassembled it all, it worked, didn't leak: it was originally brought to me as an oil slick, and a real mess, because the PO had taken it apart (more than once) to install new head pucks (he probably thought those were the leak, but not so). The original leak came from the 2 O-rings in those oil passages, which were hard as a rock and broke in half when I tried to flex one of them. The ones that were in the holes were tiny and skinny, and not as thick as the [old] head gasket, hence the leaks. How it originally got that way is anyone's guess?
