A piston is a moving part that allows air and fuel to flow in, and pushes exhaust out. It's a combustion chamber...want to do away with them just get a Rotary Engine.
If the piston has come out, the caliper will need replaced.
You need to turn the piston clockwise and it will slowly retract as you turn.
You need a hydraulic press to press the pin into the piston and through the connecting rod
No need to when disassembling.
To get the area of a piston, you need to measure the diameter or radius of the piston head and use the formula for the area of a circle (A = πr^2) where r is the radius of the piston head. Once you have the radius, plug it into the formula to calculate the area of the piston head.
flip the lever/switch again, it has both an on and off function *if you want the block to retract with the piston, you need a sticky piston
The piston will usually be a few degrees before top center.
Buy a new engine.
That is a stock bore 93-01 KX250 Piston. The part number 617M06640 is a Wiseco number. I know as I have the same bike and this is the piston kit I used. Very good piston. Do not be suckered into a single ring piston as it will not last as long.
Your piston rings need replaced. One of the two piston rings on a piston is for oil control. This is either worn or broken and needs replaced.
Well...... you need A LITTLE bit of clearance for the gas mixture to lubricate the piston and cylinder. Plus your piston expands when it gets hot.
You will need special brake caliper tool such as a C-clamp to push back the piston on the caliper of a 2002 Mitsubishi Lancer.