For a 1998 Honda CBR900RR or any motorcycle with a manual transmission, it is generally recommended to pull in the clutch when coming to a stop at a red light or any other situation where the bike is idle. By pulling in the clutch lever, you disengage the engine from the transmission, allowing the engine to run independently without transmitting power to the wheels. This prevents the bike from stalling or shutting off.
If your bike stalls and turns off when you don't pull in the clutch, it could indicate an issue with the idle speed, carburetion, or clutch adjustment. It's possible that the idle speed is set too low, making it difficult for the engine to keep running at idle without the clutch disengaged. Additionally, carburetion issues or a poorly adjusted clutch may contribute to the stalling problem.
Here are a few things you can check or consider:
Idle Speed Adjustment: Check the idle speed adjustment on your bike. The recommended idle speed should be specified in the owner's manual. If the idle speed is set too low, you may need to adjust it slightly higher to ensure smooth idling.
Carburetor Cleaning: Carburetor issues, such as clogged jets or improper fuel-air mixture, can impact idle performance. If you suspect carburetor problems, it may be worth considering cleaning or having the carburetor inspected by a qualified mechanic.
Clutch Adjustment: Make sure your clutch is properly adjusted. An improperly adjusted clutch may not disengage fully when the lever is pulled in, which can contribute to stalling at idle. Consult your owner's manual or a mechanic for proper clutch adjustment procedures.
If you have taken the Motorcycle Safety Course (MSC) and still experience issues with stalling at idle, it's recommended to have your bike inspected by a qualified motorcycle mechanic or Honda dealership. They can diagnose and address any underlying mechanical issues that may be contributing to the problem.