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The piston is at TDC. There's no stroke.

The position of the cams is what determines the stroke. The cams either neither to be exhaust closing intake opening. Or 180* both closed.

Generally speaking. But the actual cams lining up might be different positions.

There used to be marks to line up. Apparently that method isn't used anymore.
 

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As a rule of thumb. There's always one valve open in 2 cylinders.

They're never all closed.

Does the motor crank over or does it free spin? When cranking.
Hopefully the belt didn't mess up.
 
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