Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

When I removed the piston I found that the piston wrist pin was a floating design; it can slide freely side to side until it hits the cylinder wall. Which it did and was starting to score it. The Eachine engines have the same problem.
My solution is to insert a couple of plastic disks at the ends of the wrist pin. Easy to do on the Eachines but you have to shorten the pin a bit on the Enjomor to fit the disks in. Check your cylinders for scoring!