What causes the abnormal noise in the GW250 engine?
2 Answers
GW250 engine abnormal noise is caused by carbon buildup in the throttle. Specific reasons: Carbon deposits can lead to incomplete combustion of gasoline, causing engine vibration and abnormal noise issues. Effects of carbon buildup: Engine carbon deposits have significant impacts on vehicles. Firstly, they reduce engine power, resulting in uneven power output and gradual decline - in other words, the engine becomes increasingly weaker. Secondly, they increase fuel consumption, adding to economic burdens. Thirdly, they cause difficulties in cold starts, making ignition harder. In severe cases, combustion chamber carbon deposits can lead to cylinder knocking, acceleration noise at low RPMs, and damage to pistons and crankshafts, seriously compromising vehicle safety. Additionally, they cause excessive emissions, not only failing annual inspections but also significantly worsening environmental pollution.
My GW250 also had an engine noise issue last month. There was a noticeable ticking sound during cold starts, which diminished after the engine warmed up. I took it to a trusted mechanic for inspection, and it turned out to be caused by excessive valve clearance. The GW250 uses a twin-cylinder engine, and the valve mechanism is prone to developing clearance after prolonged use. The mechanic removed the valve cover and adjusted the intake and exhaust valve clearances using a feeler gauge, which resolved the problem. He recommended checking the valve clearance every 5,000 kilometers, especially for bikes frequently used for long-distance rides. Additionally, if you hear a sharp metallic scraping sound, it might indicate camshaft bearing wear, in which case a major engine overhaul would be necessary.
