Joy 10003 years of the car camshaft rocker arm are changed, that effect is not. The sound is inside the engine.
Should be the sound of the valve system, the mandrel engine if the idle speed is too low will appear in the idle when similar to this grumble, but the general is the fuel door will disappear. If you confirm that the sound is the engine came out, then most likely their voice. Check the oil pump fuel supply is normal, there is no less than the situation, re-adjust the valve clearance, not too large or too small, if necessary, you can replace a set of valve stem and the upper and lower rocker try, There may be a certain speed, the valve stem will have irregular changes, causing such a similar friction sound.
This situation is not necessarily a component damage, and more like a result of the manufacturing process is not high caused by a benign (not necessarily damaged) sound.
Motorcycle engine sound is composed of many factors: the piston and cylinder with the piston rod with the valve with the oil lubrication with the clutch with the shift gear with the chain drive with the exhaust muffler with Can make the engine sound changes, the new car sounds are generally better Honda car sound fine, mainly exhaust muffler do better.
