I need to check engine condition of my brush cutter. It didn’t run and you can see in video why. Replacing piston, cylinder and rings would cost more than whole brush cutter.
For checking I used cheap endoscope camera from ebay. Camera resolution is 640 x 480. I’m impressed how usefull is this camera.Diameter of camera is 10mm, so you can unscrew spark plug and slide it in cylinder.
Below you can see inside of cylinder.