The Kevin entity posted thusly:

>
>"Oleg Lego" > wrote in message
.. .
>> The entity posted thusly:
> Black smoke is due to excessively rich fuel mixture. Lawn
>mowers and other air cooled engines cannot produce the so called white smoke
>caused by water vapor because there is no coolant to leak into the
>combustion chamber and the muffler is too hot to allow water vapor
>condensation.

All correct.

> Any "white" or blue gray smoke from the exhaust on an air
>cooled engine is from burning oil.

It was most definitely white, or at least whiter than what I would
call blue grey, or even light blue grey, that was coming out of my
cultivator. The cause was 30:1 gas-oil mixture in the tank.