Idling a new motorcycle engine for short periods of time is generally not considered harmful. In fact, it can be beneficial during the initial break-in period of the engine. The break-in period is typically the first few hundred miles (or as recommended by the manufacturer) when the engine components settle in and achieve optimal performance.
During this break-in period, it is important to avoid sustained high RPMs or heavy loads, as this can put excessive stress on the engine. Idling the engine allows it to warm up gradually and helps distribute oil to various components, promoting proper lubrication and reducing initial wear.
Here are a few considerations:
Overheating: Idling for extended periods, especially in hot weather conditions, can cause the engine to overheat. The airflow generated by riding helps cool the engine, and when idling, this airflow is significantly reduced. It's important to monitor the engine temperature gauge and avoid prolonged idling in hot conditions.
Fuel consumption: Idling consumes fuel without providing any significant benefit in terms of distance traveled. If you frequently leave your motorcycle idling for long periods, it can waste fuel and decrease overall fuel efficiency.
Carbon deposits: Extended idling can lead to the accumulation of carbon deposits on the spark plugs and other engine components. This can adversely affect engine performance and combustion efficiency over time.
In summary, idling a new motorcycle engine for short periods during the break-in period is generally acceptable and can aid in proper engine break-in. However, excessive or prolonged idling should be avoided to prevent overheating, fuel wastage, and carbon buildup. It's always a good practice to refer to the specific recommendations outlined in the motorcycle's owner's manual for break-in procedures and guidelines.