Couple of ideas here:
If the chain is adjusted correctly, you may be hearing lifter noise, which is very similar, especially on a cold engine.
Also, in regard to cam chain wear, the guides in the engine wear as well. They are plastic and get grooves in them. They are plenty thick and I don't think will ever wear to the point the chain rubs metal to metal. On my bike, the chain was loose, even though the replacement engine I bought had a new chain in it. Peering through the chain galley, I saw the guides were worn as well. It is also possible the head had been milled down a bit much as well. My remedy was to chuck the tensioner housing in a lathe, and stick a live center in the bore that accepts the rod. I was able to remove about 200 thousandths of material from the mounting surface. This allows the rod to protrude farther into the engine, giving more adjustment range. I just needed some shorter bolts, and it has worked very well for over 2000 miles.
Just an idea or two.
If the chain is adjusted correctly, you may be hearing lifter noise, which is very similar, especially on a cold engine.
Also, in regard to cam chain wear, the guides in the engine wear as well. They are plastic and get grooves in them. They are plenty thick and I don't think will ever wear to the point the chain rubs metal to metal. On my bike, the chain was loose, even though the replacement engine I bought had a new chain in it. Peering through the chain galley, I saw the guides were worn as well. It is also possible the head had been milled down a bit much as well. My remedy was to chuck the tensioner housing in a lathe, and stick a live center in the bore that accepts the rod. I was able to remove about 200 thousandths of material from the mounting surface. This allows the rod to protrude farther into the engine, giving more adjustment range. I just needed some shorter bolts, and it has worked very well for over 2000 miles.
Just an idea or two.
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