Been thinking about this & I don't think altitude would cause pinking on an otherwise healthy bike. At altitude, the air is thinner, effectively richening the air/fuel mixture. You are more likely to suffer a lack of power, feeling like the choke is still on.
It is when you're running lean i.e. too little fuel or too much air that detonation or pinking will occur. I used to race heavily tuned Lambretta's in the 80's and had a collection of holed pistons due to my jetting/timing errors.
At worst, riding at altitude will "coke" your engine up a little and your fuel economy may suffer also.
If not at altitude & still pinking, then the cause is probaby down to incorrect ignition timing, incorrect spark plug, fuel octane or impending engine trauma.
Steve
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