This is assuming it's a very early one fitted with the 75G cast iron engine. 80's & 90's models were fitted with the black painted engine block A98/A114 alloy engine which uses different carbs and a different starting proceedure.
How old is it and what colour is the engine block painted. Is the air filter in a pllastic housing on the back of the carb or does it slide on a round inlet on the bottom of the carb?
pleasant
July 2010