Why does the motorcycle sound louder after replacing the cylinder?

[MicahLynn]

Here are the reasons why the motorcycle sounds louder after replacing the cylinder: Piston not replaced: If the engine is burning oil, the cylinder, piston, piston rings, valves, and valve seals should all be replaced. If the piston is not replaced, the gap between the new piston rings and the cylinder will be smaller, causing the piston skirt to hit the cylinder when accelerating. This will make the motorcycle sound louder. All parts replaced: If all parts have been replaced, check the valve clearance. There may be a gap in the valves. Try running it for a few days to see if it improves. Difference in thermal expansion coefficients: The thermal expansion coefficients of the valve tappets and the camshaft may not match, meaning the difference is too large. This can also cause the motorcycle to sound louder.