We'll guys I appreciate all your positive encouragement yesterday but I can't stop thinking on this.
'Long post warning.'
Something was grinding away metal flakes and we all know I didn't fix anything so one of two things are going to happen.
Whatever was wearing is now worn so there'll be no more, or it's not and there will be.
This was my second oil change at 550 miles after rebuild and I didn't look at the oil on the first one. If I hadn't by chance put my drain tray on the one bench that's under a sunny window, I likely wouldn't have noticed all these metal flakes this time either.
I was hoping that this was just old material being washed out but you'd think it would have been done by the first 100 mile oil change so I'm thinking it was still occurring after the 100 mile mark.
Was doing a small job this morning for Terry, the machinist/vintage bike mechanic who did my machining work and ran this by him. Told him about the no joy on clutch screws and he immediately thought cam chain as well, but no chunks of rubber so can't be the front guide.
He hasn't seen this either but did mention that he remembered the old CB350 cam chains would slop around sideways in the tunnel.
I chewed on that thought for awhile while working and then wondered if it's possible that I could have installed the cam off centre enough that the cam chain or sprocket are rubbing in the tunnel. I looked at some pics and there's enough clearance there that I can't see how the chain could make contact with the side of the tunnel unless it had virtually no tension on it and I would think that would be pretty noisy.
But, is it even possible to have the cam itself off centred enough that the edge of the sprocket could make contact with the inside of the tunnel? If so this could be the flakey source.
I know I'm reaching here, but something had to be doing a lot of rubbing to create that much metal flake so I'm just throwing out my wacky ideas to see what you guys might think.
I also noticed that my tick is back, it has changed from a triple to a single tick but ittttt's baaaaack. Pardon my ripped shop shorts and t-shirt.
Don't let SWMBO know I posted this.
I tried some cam chain adjustments, slacker and tighter and that didn't seem to have any effect.
Then went for a 25 mile spin, mostly at highway speed. Upon returning home, the tick has lessened considerably but is still occasionally there.
Using a mechanics stethoscope again I can pick it up as far away as the front side filter screw but it is loudest through all the letters in YAMAHA. Possibly loudest at the middle A, but pretty hard to definitively say that. Wish I could put the stethoscope on my phone/camera.
Obviously I don't know but I wonder if I might have 2 different problems going on here. One tick on the bottom and one flakey one on the top.
What could I have messed up on this badly to cause these problems?
Anyways, at this point I have to most extremely, reluctantly, unwillingly, kicking and screaming, say if you guys think I have to pull this lump again I might as well get at it. At least it will be warm this time and should go quicker second time around. I'll try the lay on the top tube (with an old pillow) and lift with your arms method.
Looking at the top end again certainly isn't the end of the world, just a PITA at this point, but might I be splitting the cases as well?
I don't know what I'll be looking for and would sure hate to go through all this to end up still stumped.
I mentioned to Terry that I was going to run it for about 100 miles and then do another oil change.
He said, “Well, keep an eye on it and if there are more flakes you know what that means, and it will be obvious what the problem is”.
Maybe so for an experienced eye like his, but for me, don't know.
So, I don't know. I'm posting these thoughts to get feedback from you guys who have the experience in spite of the fact that I may not like what you have to say requires me to do. Whatever it takes, I just want this done, and done right.
Jeesh, maybe I should just put this plate, tank and tins on my 78 and ride it.