Police: Airsoft Rifle Sniper Hits Woman, Baby In Bremerton (KIRO 7 Seattle-Tacoma)

A 29-year-old man is arrested and charged with second-degree assault after he allegedly shot a mom and her baby daughter with an airsoft rifle, said Sgt. Kevin Crane of the Bremerton Police Department.

Next time.... What happened to the ignition system?

First off all look at the system. So the engine not running must be symptomatic of

The next critical thing is to check the keyway. 8 times out of 10 the key gets sheared. This can occur from sudden stops of the engine. A sudden stop can occur from various reasons such as a broken chain grabbing hold of an activated clutch. An instantaneous shock load can be introduced into the system.

The possible causes for no spark are:

Pulled the spark plug out and tested for spark:

What do I do? Cry? Uh...No...

Go Kart Engine Repair - Ignition System Diagnostics Part II

That's it.

No Spark:

The problem is that I was riding my go kart... blew the chain... made a massive clunk...engine still ran right up until I shut it off. I replaced the chain and now it won't start.

Or a faulty ignition mechanism

Faulty Spark Plug (ie short circuiting because of ash contaiminents, broken insulator, too much gas on plug)

Last time we discussed how magnetic fields cause current to flow in wires. The current flow is then harnessed to make the spark plugs work.

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The other way an engine can be come jammed suddenly is if the rod blew inside, or the engine ran out of oil (seized up).

-Is there a magnet in it anymore?
-Did it get damaged? (very unlikely) Check with screwdriver: does it stick? (check, yes there is a magnet)

Well I cleaned the plug well. Used a different plug...

By "okay" I mean the following:

First of all the system consists of:

{In the olden days you had a switching circuit called points, but I will not bore you with that. I have several old motors that have points. (If you are really interested in points I will write an article about trouble shooting those...but not today.)}

Note: But you know what I should have done first? I should have taken the plug wire and tried it against the engine. Well I tried that too: no spark.

This is where stuff starts coming apart.

Now we will discuss how to trouble shoot this system.

Yes I checked it was ON! Also I removed the off wire from the switch near the engine. Still nothing. (check)

So yes, I checked.. there is gas. (check!)
The engine has nice resistance and compression (no thrown rods, no loose valves, everything is tight...) (check)

And for those with Vertical Lawnmower Engines, there is a special section just for you! Don't throw away that vertical engine just yet!

-No Gas
-Flooded (too much gas)
-No compression
-No Spark
-Switch is off!

Not looking good here... What do we do next?

-A flywheel with a magnet
-A magneto with a main coil and a switching coil
-An On/Off wire
-A spark plug and spark plug wire.

So what's the problem?

Ignition System Trouble Shooting.