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Hi all, I hope someone could help me, i put some fuel in from a superstore garage (Tesco) it was supposed to be suitable for all petrol engines (it was super unleaded BP stuff). The results were fantastic..... From standing very poor power a push off with a foot helped, once on the move up to quarter turn on the throttle gave me some power anything over that the engine would loose power and strain. So i drained the tank, and flushed the carb through with normal unleaded and refilled the tank with normal unleaded did an oil change (oil was thick black no metal filings). This resulted with power to pull away but still power loss when over half throttle turn. It sounds like as if changing gear half way through acceleration. things i have done... Replaced Spark plugs, checked chain tension, checked Brake free movement front and rear,cleaned air filter, checked oil filter, adjusted idle screw (made no difference) checked throttle cable movement. Is their something i have missed or a solution to this. thanks Bryan