This might not help... Get a new one.
TRAXXAS would be great for begginers if you have the $ for the car and parts altho they they are very strong wou will break parts going 30 - 90 MPH (you can go 90 if you upgrade with any traxxas very very pricy 800$) they are very fun hope this helps
If the engine is froze up, the flywheel can't be turned. You can use a socket and breaker bar on the crankshaft bolt, work it back and forth in both directions and it might break loose, but I wouldn't count on it. Usually you have to take the caps off of the connecting rods in order to turn the crank.
Hitting a rock can certainly cause some damage, depending on the size of the rock. Most commonly, the shear pin in the flywheel keyway will bend or break (it is made to do so) and the engine won't start or will be hard. Not as common is for the drive shaft to bend or break, or internal damage to the engine.
You could stretch the bolts, strip the threads out of the flywheel or break the bolts off in the flywheel.
Something has bound the shaft or crank on the engine to cause the key to pop. Could be if it backfired - that will cause the shear pin to break - or if you caught something underneath it with the blades that would cause it.
bad, you can break teeth of of your flywheel or your starter
definitely NOT but you need to block movement or rotation of engine, best done by removing flywheel cover and clamp flywheel with vice grips-that will prevent the rotation after slight rotation and lockup. Nut on front is tight and will take 1/2@ breaker bar and a cheater pipe. Haven't seen a impact that will break those nuts
All windows are made with a thermal break inside the frame.
A slipping clutch may cause cracks on the flywheel wear surface from excessive heat. The cracks would be reason enough to replace the flywheel when replacing the clutch assembly.
Engine crankshafts usually break when there is too much pressure on them. Some have flaws and may break under normal use.
The pin (aka shear-pin) on the flywheel keyway is made of aluminum and designed to bend or break on a sudden impact to prevent engine damage. This will cause the engine to be off timing and not start. The pin will have to be removed and replaced.
Yes, they can break or just wear out.