bcjm

I sprayed the fuel to the cylinder directly.  That should not be the issue.  I have another engine with 50 psi compression and no carburetor.  It starts right away with fuel sprayed into the cylinder.
I will check the flywheel key issue tomorrow.

This is a strange problem.  I walked away a year ago now try to work on it again.   I am running out of ideas.  I have an old Homelite generator using a B&S 243431 10HP engine.  It has good compression (75psi) and sparks but wouldn't start.  I have a new iginition coil as well.   I sprayed the starting fluid into the spark plug still no luck.  Not even trying.  I see sparks when having the spark plug sitting against the engine block. The only possibility is the sparks are "weak".  I can't really tell.  Is it possible?

What do you think?  What else I can try?

Thanks
Bob

OK.  This one seems explains better. http://eu-en.myfaqcenter.com/Answer/?p_faqid=3832

There is another governor spring inside the engine to balance the governor spring outside the engine.

Ok I read couple of different papers regarding how governor works.  Still confused.  Say an egnine support to run at 3500 RPM.

Is this true: when the engine load increases, RMP drops, governor moves arm(due to RPM change),  arm pushs the throttle opens more,  engine back to the same speed.  So no matter what load the engine has the RMP stays the same.

If that is true when does the governor spring comes in to play?  How is the engine idle speed accomplished if governor suppose to set the engine speed to 3500 RPM?

Knowing just the Cibic Centimeters is almost useless to me.   A two liters race engine is complete different from a 2 liters engine used on the street.  I never pay too much attention on the actual size but the HP rating when buying a car.