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Good advice in the previous posts.
Beg, borrow, or rent a strobe, and set the timing according to the Boyer instructions. It is -critical- you do not advance past that point.
Is this a new problem? What have you changed?
Have you ever 'decoked' the combustion chambers?
Are you burning the highest octane pump fuel you can buy?
'Read' the plugs to check carbeuration(sic). A lean mix can also cause 'pinking'.
If it still 'pinks', and retarding the timing just a bit from spec won't help, try an 'octane boost' additive or some leaded avation fuel mixed with your pump gas..
If it still 'pinks' under full acceleration, maybe you should not accelerate so ***** 'fully'.
It is a fine classic motorcycle. Not a Kawasaki krotch kamakazie :wink:
One more unlikely possibility?
If that 'timesert' is too long, and protruding into the combustion chamber at all, it'll get red hot and act like a 'glow plug' in a diesel engine......
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