What Causes Motorcycle Oil Burning?
2 Answers
The piston ring oil ring has insufficient elasticity and excessive light leakage, leading to oil burning, which is a problem with the piston ring itself. Excessive clearance between the valve stem and valve guide, or poor sealing by the valve oil seal, can also cause oil burning. Issues such as poor cylinder dimensions, excessive ovality, or surface scratches and grooves prevent the oil ring from scraping excess oil off the cylinder walls, allowing oil to enter the combustion chamber and participate in combustion. These factors can all lead to motorcycle oil burning. It is recommended to promptly visit a repair shop for inspection and maintenance. Warming Up Before Starting: After starting the engine, it is necessary to warm it up for 3-5 minutes before beginning to ride. Engine warm-up is an essential task that should not be overlooked, especially in low ambient temperatures. However, avoid revving the throttle excessively to speed up the warm-up process. An insufficiently warmed-up engine will accelerate wear on components such as the cylinder, piston rings, and rocker arms during operation. Gear Shifting Operation: After the motorcycle starts, the next step is accelerating and shifting gears. During gear shifting, the period when the clutch is 'disengaged' is a 'neutral interval,' during which neither acceleration nor throttle control can be used to adjust the motorcycle's speed. The motorcycle can only coast on 'inertia.'
Recently, my old motorcycle has been emitting blue smoke. After checking for a while, I found that it’s mainly due to worn piston rings causing oil leakage. After nearly ten years of use, the piston rings have worn out, reducing their sealing ability, allowing engine oil to seep into the combustion chamber and burn. Additionally, aging valve stem seals can also lead to oil leakage. The mechanic said this is a common issue with older vehicles. I also heard from a friend that long-term use of low-viscosity oil or high engine temperatures can accelerate oil consumption. If not addressed in time, the exhaust pipe will be full of carbon deposits, and the engine’s performance will deteriorate. It’s recommended to regularly check the oil dipstick. If abnormal oil consumption is noticed, get it repaired promptly. Replacing piston rings or seals can solve major issues, and the cost isn’t too high.
