If you're experiencing a squeaky noise on your motorcycle at intervals, even after replacing the brake pads and wheel bearings, there could be a few other potential causes to investigate:
Drive Belt/Chain: If your motorcycle is equipped with a belt or chain drive system, it's possible that the noise is coming from a misaligned, loose, or improperly tensioned drive belt or chain. Check the tension and alignment of the belt/chain, and adjust it according to the manufacturer's specifications if necessary.
Suspension Components: Squeaking noises can also originate from suspension components such as the shocks, forks, or swingarm. Inspect these components for any signs of wear, damage, or insufficient lubrication. Ensure that all bolts and fasteners are tightened to the recommended torque specifications.
Exhaust System: A loose or damaged exhaust system can create rattling or squeaking noises, particularly under load. Inspect the exhaust system, including the muffler, headers, and mounting brackets, for any loose or damaged parts. Tighten any loose connections or replace damaged components as needed.
Wheel Spokes: If your motorcycle has spoked wheels, loose or improperly tensioned spokes can cause a squeaking noise. Check the spokes for proper tension and adjust them as necessary. Ensure that all spokes are tightened evenly to maintain wheel balance.
Engine Components: Internal engine components, such as valves or camshafts, can sometimes produce noise that appears to be coming from the wheel area. If you suspect an engine-related issue, it's recommended to have a professional mechanic perform a thorough inspection to diagnose and address the problem.
If you're unable to identify the source of the noise or if the issue persists, it's advisable to consult a qualified motorcycle mechanic. They can conduct a detailed examination and diagnose the specific cause of the squeaking noise to ensure that your motorcycle is safe and in proper working order.