Hey grumpy. Seems as I thought, something wasn't quite right with this engine. Ok the carby may have been converted, or to throw a spanner in the works could it have been the cowling that's been exchanged (perhaps the starter cord broke so someone just swapped the whole cowling)therefor showing the 2.5hp decal and code numbers to suit instead of what may have been originally been a 3hp engine? The reason I'm inquiring is because I would like to refurbish the engine and have the correct decals to suit. Please correct me if I am wrong but I guess the only way to tell for sure is to take the head off and measure the stroke and bore. The engine does have breaker points which I had to clean and adjust to .020'' because it had little spark and would not start.