I have restored an old Honda cg125 that has not been used for about 3 years. Everything on it has been cleaned, powder coated and replaced where necessary and it looks a treat. I have got it running but it is very load, way loader than normal and it almost sounds dry or tinny. Engine has not been apart as it was running ok when it was parked up.I have checked oil pressure and it’s all good with fresh oil. It also misfires a bit and I’m wondering if it’s the replacement exhaust I have fitted. It has been tightened up and gasket replaced but it still doesn’t sound right. Pushrod engine so can’t be a cam chain noise. Any ideas?