Adjusting motorcycle valves, also known as valve clearance adjustment or valve lash adjustment, is an important maintenance procedure for motorcycles with internal combustion engines. The valves play a crucial role in the engine's operation by allowing air and fuel in and out of the combustion chamber and facilitating the expulsion of exhaust gases.
Over time, due to engine wear and thermal expansion, the clearance between the valves and the valve train components (such as the camshaft and rocker arms) can change. If the valve clearance becomes too tight or too loose, it can lead to various issues, including reduced engine performance, noisy valve operation, poor fuel efficiency, and potential engine damage.
Adjusting the valves involves setting the correct clearance between the valve stem and the corresponding valve train component. This is typically done by using feeler gauges to measure the existing clearance and making adjustments as needed. The process may vary depending on the motorcycle's engine design, whether it has an overhead camshaft (OHC) or an overhead valve (OHV) configuration.
The benefits of properly adjusted valves include:
Improved engine performance: Correct valve clearances ensure optimal airflow and combustion, allowing the engine to operate efficiently and deliver maximum power and torque.
Quieter valve operation: Properly adjusted valves reduce valve noise, resulting in a quieter engine.
Extended engine life: By maintaining the correct valve clearances, you can minimize the risk of valve damage or excessive wear, which can lead to costly repairs or engine failure.
It's important to note that not all motorcycles require regular valve adjustments. Some modern motorcycles have hydraulic valve lifters or self-adjusting valve mechanisms that eliminate the need for manual valve adjustments. However, for motorcycles that do require valve adjustments, it's essential to follow the manufacturer's recommended service intervals and procedures outlined in the owner's manual or service manual.
If you're unsure about performing valve adjustments yourself, it's recommended to seek assistance from a qualified motorcycle mechanic who has experience with your specific motorcycle model. They can ensure the valves are adjusted correctly, promoting optimal engine performance and longevity.