Greetings, been having a conflab MBG and have determined the following - prior to the now not so extortionate (€800) ish, cost of a big bore kit to 695 (700cc) the price of going bigger was avoided by boring out 77mm barrels to 80mm and fitting 126BIS pistons (cheaper) this made the barrel skirt rather thin and there have been instances of bits breaking off with the resultant damage. I believe this is the basis of the mod to my engine and that it was done some time ago. I am informed that to over bore a 77mm barrel to 79.5mm is ok. With the cost of the 'big bore' kit(s) reducing, the over boring to 80mm has fallen out of favour. Is there anyone else out there with this mod that continues to run with the barrels thus modified???