My system does not heat the house. I use the radiator heat to supplement my garage heat in winter.

Ha Ha !!!

Wow, that's quite a story.
You put an ST-15 on the back seat of a Subaru ? 

That's a good one !

Usually if the engine overspeeds, then the voltage goes up as well. (Depending on the generator head you are using)
Perhaps check for a voltage sensing relay (Ebay ??)

EG: If the voltage on a 240VAC generator raises to =>250 VAC, then trip the relay which energizes a kill solenoid on the fuel rack.

Just a thought

I agree Mike90045,

Flywheels can't make power. They only add inertia (momentum)
There will not be any additional HP from the engine. (Physically impossible)
No amount of flywheel can make a 6/1 put out more than 3 to 4 kws of generator power.
His flywheel inertia may provide 15kva of stored energy for about 12 seconds 
It's a scam.

Exception:
Use a 6/1 to slowly (through transmission ratios) speed up a massive Mass Flywheel Storage battery (perhaps 4 tons in weight), to 10,000 rpm.
Then disconnect the engine and use the Flywheel battery momentum to drive a generator for X hrs (depending on how much load is applied to the flywheel inertia battery.)
However, he is not doing this.

Commercial Inertia Batteries are gaining in popularity. They use excess electrical power produced during the night to spin up heavy flywheels to high rpm.
During the day when the grid demands power, the flywheels power generators for several hours to assist peak loads.

The spanner is to remove the flywheel nut.
What you guys call the "spark plug socket" is used for con rod nuts and other internal fasteners.

Please report back when you adjust the IP timing.
I am interested to know how it effects the ignition knock and noise levels.

That CERTIFICATE OF QUALITY is amazing !   only 27,000,000 engines per year get that esteemed label, you are lucky to get one. Mine did not have such a label.

Thanks everyone for the fast replies. 

veggie

... and why is the rod bent?
Did the missing piece fall down and briefly jam the valve rocker right where the pushrod contacts the rocker?
Check all around the floor where you first removed the valve cover.

If you have the manual that came with the engine, check to see if there is a lever that is supposed to fit onto that decompression stub shaft.
My Changfa's came with an exploded view parts list (in Chinese of course). Although mine is a different model so it does not apply to your monster 1115