Universal Flywheel commonly found on 33cc, 36cc, 43cc, 47cc and 49cc 2-stroke pocket bikes and mini gas scooters

• Overall Outer Diameter: 110mm
• Bolt Hole Spacing: 52mm
• Thread Size: M8x1.25

Here's some information about the flywheel and its role in these engines:

1. Purpose: The flywheel serves several purposes in a two-stroke engine. Primarily, it helps store rotational energy during the power stroke (when the air-fuel mixture ignites) and release that energy during the compression and exhaust strokes. This rotational inertia helps smooth out the engine's power delivery and keeps it running at a consistent speed.

2. Ignition Timing: The flywheel has a magnetic pickup or trigger coil that works with the engine's electronic ignition system. As the flywheel rotates, the trigger coil generates a signal that determines the precise timing for the ignition spark. Correct ignition timing is crucial for optimal engine performance.

3. Magnets and Coil: Inside the flywheel, there are usually magnets that create a magnetic field. When the magnets pass by the trigger coil, they induce an electrical current, which is used to trigger the ignition spark at the right moment.

4. Replacement: If you're considering replacing the flywheel on your 33cc, 36cc, 43cc, 47cc, or 49cc two-stroke pocket bike or gas scooter, it's important to ensure that the replacement flywheel is designed for your specific engine model and displacement. Flywheels can vary in terms of their design, magnet arrangement, and ignition trigger characteristics.

5. Professional Assistance: Replacing a flywheel requires some technical knowledge and tools. If you're not familiar with engine mechanics and ignition systems, it's advisable to seek assistance from a professional mechanic who has experience working on small engines.

6. Safety Precautions: When working with any part of an engine's ignition system, it's important to disconnect the battery and follow proper safety protocols to prevent electrical shock or other accidents.

If you're experiencing issues with your pocket bike or gas scooter's ignition system, and you suspect that the flywheel might be the problem, it's recommended to have the engine diagnosed by a mechanic who specializes in small engines. They can properly diagnose the issue and recommend the appropriate steps for repair or replacement.