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Yamaha Generator problem
First, off, although you don't say so, I would hope you flipped the main service breaker off before you tried to light up the generator.
If not, you were powering the entire grid, including any poor linesmen who may have been working on the lines at the time.
Such an overload should have, as Joel mentioned, blown a fuse or breaker on either the generator or the house's wiring before doing any damage.
If the breaker is popped it may not seem so, sometimes you have to completely flip it off, then back on before it will go on again. If this does not work the breaker may be defective and just not resetting itself.
Best of luck.
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Yamaha Generator problem
Well, let's start with the basics.
When you turned off the main service breakers, did you also shut off all but just the 110 volt circuits you wanted to power?
Secondly to that, are you sure the 110 cicuit you wanted to power is on the same leg of the main 220 as the generator was plugged into?
From the description thus far, my guess would be that no other breakers but the mains were flipped, this caused a HUGE overload on the genset causing the breaker on it to trip.
Best of luck.
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Yamaha Generator problem
Generally speaking you won't find a generator any bigger than about 3KW that produces ONLY 110 volts. Above that (some smaller) produce both 110 & 220 volts.
In basic terms a generator of that size will run only one circuit at capacity.
If the circuit it is plugged into is not isolated from everything else, it will try to power everything on that leg of the 220 service, AND will give power to half of the 220 circuits in the house too.
A 220 motor such as those on a well pump won't last very long with 100 volts on one side and not the other.
Best of luck.
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Yamaha Generator problem
Billy, it depends on the wiring of the motor. Some of them will certainly TRY to run. 
Even if it is of the type you are referring to, there will still be quite a load on the one leg of the 220 that the generator is back-feeding.
There's a big difference between the motor doing nothing, and it have no effect. The motor won't turn, but it will sure create a heck of a load.
Best of luck.
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Yamaha Generator problem
Billy, you are right that the motor will stop if you disconnect EITHER of L1 or L2, however it is certainly not the right way to do it, nor is it safe since the 'other' leg is still 'hot' in the motor as Joel pointed out.
In some states switching a single side of 220 is not legal either. You should always use a DPDT switch and break both hots.
Best of luck.
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Yamaha Generator problem
Billy, I understand how they work, I have a similar system in the milk parlour.
IMHO though, the micro switch should trip a DPDT magnetic switch, that way you have two levels of safety, first the micro switch can be only a low voltage trigger circuit, and secondly, the system is absolutely dead unless running.
Best of luck.
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