Thought I'd add the details of a good mechanic in Iran. I was riding an Enfield Bullet back to Uk when the Piston snapped in half (don't ask!). He sent someone to Tehran had a new piston made and fitted it. He was very friendly and competent. THe details are

Mr Seyfollah Kalfkhany
Repairing Shop - Opposite the water organisation
Mosallah Square No.10
Khoy
Iran.

Don't know how he'd be with ultra modern bikes but he had a few modernish bikes hanging around.

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Cheers,

Ben