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That's correct, #6 on page 2. That will keep the sprocket from riding sideways into the rotor. I remove the starter clutch rollers, springs, and caps from the rotor, and keep the sprocket from rotating with a short 6mm bolt installed in a hole drilled and tapped into #6 that engages between two teeth of the starter sprocket. Under standard conditions, the sprocket only rotates when the starter is in use. #6 is hardened, and can be difficult to drill and tap. Hope this helps, Chase

Update, localized the sound to the left side points cam. Took off both valve caps and both valves feel completely dry to the touch. You stick your finger in each hole and swish around and come out totally dry. That doesn't seem normal.

After riding 75 miles the chirpping started? and both valves are dry on one side?
You may have an oil supply problem, that may have been caught before really serious damage has been done.
I think that squirting a lot of motor oil on both valves may be a starting point, turn the motor over with out ignition and listen for the chirp.
A hung or partially seized valve could drop compression and make noise.
Still have to determine if there is an oil delivery problem and the motor has to run to check for flow to the top end.
Keep us posted with your diagnosis and we'll help.
Allan

Thanks! Good test. Will try squirting some oil.

Russ, did the oil make any difference?
The only way that I know of to check for oil flow is to loosen both rear outside head nuts while the motor is running, I would loosen the left side only and look for a flow of oil- if you have oil leaking then loosen the right side.
When both rear head nuts are loose you should have oil leaking from both sides, if it only leaks on the right side then you have a problem with oil pressure/leakage or an obstruction in the feed between the outside rear cylinder studs or the feed hole at the base of the left rear stud OR possibly a clogged pump filter which is accessed by the clutch cover.

WAIT! Did you check the rotor as suggested for rollers or springs that might be causing the chirp?
I hope its as simple as that!
You can just pop the rotor off, run it & know right away if the chirp has left.
Still have to make sure that the left side is getting oil.
If it is an oil problem, then you will have to drop the motor.
Let us know what you find.

Have not had time to get out and work on it.

Hope to get out there soon.

Thanks a ton everyone that has replied!

Cam and rockers destroyed. Metal flakes inside head.

End gaskets were correctly installed, with holes for oil passage aligned.

No obvious cause of oil blockage.

What next?

(Other than finding new cam and rockers)