After your rebuild is done, and she has a few hours on it does anyone retorque the cylinder? On the two stroke bikes we retorque the cylinders after a few starts and letting them heat up? The cylinder base gasket could leak if the torque isn’t where it should be. This retorque makes sense to me. Why did my am cylinder kit fail? I’m thinking pre lube and air leak down test wasn’t done and a retorque. On car engines I went 10# past the torque specs and it was close to spec during the retorque check.