Quote Originally Posted by Ischel View Post
Hi, I experienced a similar type of weird sound when using minor quality gasoline in one of my bikes some years back...maybe a first easy thing to check, if not yet done.
Perhaps you had a lower octane/grade of petrol? Check out AKI = Anti Knock Index...
my BMW GS has a AKI 87 means equivalent 91 RON. If use less than that then there will be an audible knock inside the engine (Some might refer to 'pinging' sound) especially under load. Gently does it... if one can only find a lower than recommended octane gasoline/petrol.