It is hard to see the condition of the head from the picture.
If You are asking a dealer- You need all new head with everything inside new.
If the question is "what would I do?"- new rocker arms, may be new cam chain,new cam if I feel like a big spender /I'd recommend this to You / , or if not- just use 500 and after that 1000 grit sand paper to round and smoothen the damages of the cam, change the valve seals and put everything back together.

t. dupree wrote on 12/31/69 at 16:00:04:


Tom,

The camshaft runs in "plain bearings" in the head and headcover, and if there is damage to those, you'll have to replace both parts.  I've never heard of oversize parts and cannot image how any regular machine shop could rebore the journals either.  I do believe that you can have the cam reground if you decide to do that, though.

Now, I've studied this photo and compared it to ones that I've taken.  (I'm about cross-eyed now, too).  Is this looking through the intake valves?  And what we see is the intake lobe on the camshaft?  I see the scrapes on part of the bearing surface too, but that particular area is not under the headcover.  The worst part about any scrapes is a loss of oil pressure....

I'd pull the headcover for a closer look before deciding....

Now, about the knocking sound in the bottom end.  Can you tell where it comes from?

I am amazed that this thread has gone this long with no comment from Sluggo stating there's no such thing.

LANCER wrote on 12/31/69 at 16:00:04:


Sure, line boring the cam journals could be done, and bronze inserts would certainly beef up the camshaft, but I just have a feeling that machine shop costs would be prohibitive compared to buying a used head/head cover.  I could be wrong....

t. dupree wrote on 12/31/69 at 16:00:04:

Tom;
Have you bothered to check the oil clearances between the camshaft journals and head/head cover journals?
If they are under .006" they are within limits.

Thanks for all the comments
Sorry about the worn bearing confusion. I have always called them bearings because they are bearing surfaces (not ball or needle bearings)
One of the main reasons I posted was to see if this motor was even rebuildable with the initial damage I found looking through the valve cover. I figured if the motor was not repairable (cheaply) I might as well part the bike out instead of investing a lot of $$ and time in it. Reading everyone’s comments tells me that all is not lost and I will tear the motor down to see how bad it is. I will post my findings if anyone is interested, but it may be a few weeks before I get to it.
WD, I agree with your oil theory. Either too thin oil weight or intentional over revving caused this. The bike has 16,000 miles on it and the motor should have lasted longer than this with proper care. I believe the knocking is piston slap (piston pin worn) because it sounds pretty high in the motor. I’ll find out when I tear it down.
 Greg_650, I also noticed that the scrapes are on the head and not the head cover. Also, the head cover does not support the camshaft directly above this location. It makes me wonder if the cam is even supposed to be touching the head at this location. If not, the cam journals must be way over the .006” that Woodworker says they should be.  
And finally, it took me a while to figure out what Savage_Rob and bobo383 were talking about (I’m a newbie to the forum) but I have to agree with Sluggo as long as there’s a woman actively involved.
Again thanks, TOM