I agree with John F., pinking is usually a sign of a low octane fuel & altitude that can sometimes be lessened by retarding the ignition timing a few degrees i.e. the plug sparks when the piston is closer to TDC. This is not always easily possible on modern bikes with the ignition advance/retard controlled by an ignitor box rather than a mechanical points type set-up.
Severe pinking for long periods can & will burn a hole through the piston crown. If a higher grade fuel is unavailable, try finding some sort of octane booster to add to the fuel (off road shop?).
Steve
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