If you own a moped, sooner or later you're going to need to work on it. Trust me on this one... Once in a while you may need to remove the flywheel or clutch. This can be tricky to do because as you try to remove the nut, the motor will want to spin. How does one stop the motor from turning, you ask?
I'll show you how to use it.
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Step 1: Krusty Bike
So, this is the victim. It's a 1977ish Sachs moped. Adorable, isn't it? Believe it or not, this bike needs some work done to it. Clutch work. Apparently, Sachs motors have notoriously crappy clutches. If you have an impact driver, the job would be easy, but you don't, do you? Didn't think so. That's why you're reading this Instructable about using a piston stop. But it's okay. That's how we roll in the shire. Let's move on, shall we...
Step 2: Follow duh Wire...
You're going to need to remove the spark plug. "But where is duh spark plug" you ask? Just follow your nose... to the wire that leads to the spark plug. It's typically the 7mm wire that runs to the front of the motor. Still lost? Take out your calipers and start measuring the wires and find one that's 7mm. What's that you say, you only have dial calipers that use the Imperial measurement system and not metric? Fret not, it should read 0.2756 inches. Aren't I a sweetheart! Anyways, pull the "boot" off from the sparkplug.