I've found an old and battered 75 (7.5hp) in a shed clearance for 20 quids. It's been in a shed for sometime, and the exhaust holes (2) is totally gundged up. After clearing it, and some fresh unleaded later, it started without any problems-except, there are smoke coming from underneath of the engine, i.e., bottom of the exhaust pipe. I have run it for half an hour without any problems if the cover is off, but as soon as the cover is put on, the air is fouled and it dies.<br />Is it worth saving, and if it is, how difficult and what steps are needed to fix it? <br />All I want is to fix it and sell it on for a big profit as they are quite desirable.
