What Causes Increased Fuel Consumption in Motorcycles After Long-Term Use?
2 Answers
The reasons for increased fuel consumption in motorcycles may include: excessively large carburetor jets, improperly adjusted carburetor air-fuel mixture, or issues with the fuel system. Specific causes: Driving system, transmission system, and braking system: Check whether the front and rear wheel axle bearings are damaged or adjusted too tightly, or lack lubrication; whether the drive chain is too tight; and whether the front and rear brakes have poor return causing resistance. Engine aspects: After cylinder boring, use a cylinder pressure gauge to measure; the pressure should not be lower than 7.5 kg/cm2. Next, inspect the ignition system, including whether the high-voltage spark energy meets standards and the ignition timing is accurate. Then, consider whether the carburetor is improperly adjusted. Additionally, issues such as incorrect valve timing in the valve train and piston connecting rod mechanism, or intake and exhaust valves not sealing properly, can be quite complex.
I've been riding motorcycles for over a decade and noticed it's quite common for fuel consumption to gradually increase with prolonged use. Mainly due to engine aging, where worn-out components reduce efficiency. Piston ring blow-by causes incomplete combustion, wasting fuel. Spark plugs tend to accumulate carbon deposits after years of use, leading to unstable ignition which also increases fuel consumption. Additionally, low tire pressure increases rolling resistance, making the bike feel heavier and consume more fuel. A clogged air filter restricts airflow, reducing combustion efficiency and increasing fuel usage. Regular maintenance is crucial - like changing engine oil and checking the drive chain. Riding habits matter too - frequent hard acceleration can spike fuel consumption. Neglecting these issues long-term not only costs more but may also cause minor malfunctions leading to safety hazards.
