Making a generator from a two wheeler engine

I have heard about people making a generator from old car engines but those produce a lot of electricity ,much more than a small house would require.

I can manage an old bajaj scooter to make a generator as I guess this should be sufficient for a small home.Is there anyone who has tried it before or someone who can explain the process?How much current can I expect to be produced from from a 150CC engine?

Would it be prudent to make it into an LPG generator to save running costs?And, also what would be the cost in making it.

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Well, you could easily build a 1-2kW generator giving out 230VAC at 4 (or 8 amps for 2kW) - the hard part I feel is finding an appropriate alternator (NOT the usual vehicle alternator) in the market - if you have managed to get the engine the alternator will cost more than Rs. 5000 (JUST A WILD GUESS!!). Other things to take care of would be the exhaust emissions, noise, etc that the engine will produce.

To get a rough estimate of how much power the generator will give - convert the engine's power into watts - that's the best it can do. A 150 cc engine can manage upto 7hp - so that's about 5.5kW. Practically due to the alternator & mechanical losses you will get about 4.5-5kW.