Your Thoughts on Engine Wear? Good pics.

I'm just wanting to clean up the pistons, replace the rings and hone the cylinders, clean up the valves and replace the seals. Tell me your thoughts based on what you see please. Odometer reads 24000 miles. What about the wear on the cam bracket on the left and right. All other parts look good. Cheapest place to get engine rings?

By the way, 1980 kz 440A ltd.

Did you run a leak down or compression test to get a baseline before tearing it down?

No. Why would that matter if I'm redoing the rings, checking the bores, honing the cylinders and redoing the valve seals?

At 24k miles, pretty unlikely it needs rings or cylinder work. Definitely a valve job and new valve seals. MY 750 twin didn't need cylinders done until about 75k miles.

I don't know if the scoring on the right hand cam journal is a problem, you need to plastigauge it for wear. It doesn't look good.

Agreed - this was likely head work only that was needed. That journal looks nasty, hard to say without checking/feeling it.

It does look a little rough, what would have caused that and what could be done to fix it? What could be the repercussions of not fixing it. The other two look good. So you think just clean the pistons and not replace rings or hone the cylinder?

The scoring on the journal does not look good. I would think the cause was lack of oil flow or an issue with torque on cap bolts or improper valve/tappet settings.

What does the cap look like, and what does the cam look like? Are they scored as well? As others have said you need to measure (plastigauge)it to see if it is still within spec. Would also suggest measuring cam to see if it is still in spec as well.

Jay98 wrote: No. Why would that matter if I'm redoing the rings, checking the bores, honing the cylinders and redoing the valve seals?

It would have told you if you actually needed rings or a valve job.
Since youve already got it torn down flip the head on its back side so exhuat ports are pointing up then fill exhuast ports full of solvent.
Then take an air hose with one of those blow gun things on it and blow around the outside edge of exhuast vales where they meet the head.
If you dont see any bubbles in the solvent you know the valves are doing a decent job of sealing,then flip the head the other way and repeat on intake valves.

Is there cam bearings that go in that head or does it just ride on the casting?
That journal scares me

wireman wrote: Is there cam bearings that go in that head or does it just ride on the casting?
That journal scares me

Looks like an insert in the photo, but hard to tell.

DoubleDub wrote:

wireman wrote: Is there cam bearings that go in that head or does it just ride on the casting?
That journal scares me

Looks like an insert in the photo, but hard to tell.

I thought it looked like a bearing sitting in there too. The other two have no visible ledge like the third does.