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It's doable, but not exactly a "no tools required" operation:

- You need something to measure the position of the piston inside the cylinder, and fairly accurately. That's usually a job for a dial gauge, a type of dial meter that gets screwed in the place of the removed spark plug and extends down to the piston. It's job is to indicate you where the top dead center is.

- For adjusting the timing, you need to know when the ignition points break. You can see that by either having a lightbulb connected to where normally the coil would go (which is now disconnected to avoid getting a shock) or simply watching the spark plug closely and spotting the moment it sparks.

- Also, you need to know what the specified timing is, in distance-before-top-dead-center.

At this point it should start getting obvious. You slowly turn the crankshaft with a wrench, and reset the dial to zero when you find the top dead center. Then you proceed to locate the point where the ignition points open, just before the TDC, in the normal direction of rotation of the engine. The dial gauge should now tell you how far before the TDC that is. Consequently you tweak the timing (usually by nudging the point fixture around a bit) until the measured distance gets equal to the one specified. The same job can be done with a stroboscope, with the engine running, if the engine has proper markings and the points are adjustable on the go, but that's a different story.

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Q: How do you set timing for 2 stroke engine?
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