Thanks Steve
I spoke to David yesterday using the number you provided, he was just on his way to Moroco but can help me.
He can obtain oversized pistons larger than the largest Yamaha ones and at standard compression (possibly the Wiesco ones, David didn't say) and so my original barrel & liner can be re-used. Not sure if the yamaha head gasket can be used without modification.
How if onlt I hadn't stupidly snapped off the front cam chain blade bottom locator from the crank case by allowing the cam chain to bunch up here, ARRRRRR !!!
PS: I'm in Bristol, England after a 2 year UK to Auz trip.
Mark
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