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6628 Flywheel, Billet Subaru Ex 21 Adj
6628 Billet Flywheel – Subaru EX21 Adjustable Timing
The ARC Racing 6628 billet flywheel is engineered for Subaru EX21 engines and designed for high-performance kart racing and small engine builds that require precise ignition timing control. This adjustable timing flywheel allows engine builders to fine-tune ignition timing to match specific camshaft, fuel, and compression setups for optimal performance.
Precision-machined from high-strength billet aluminum, the 6628 replaces the factory cast flywheel with a stronger and more reliable racing component. The adjustable hub design allows timing changes without requiring offset keys, making it easier to dial in engine performance for competitive racing applications.
Key Features
- Billet aluminum construction for high-RPM durability
- Adjustable ignition timing design for precise tuning
- Designed for Subaru EX21 overhead cam engines
- Improved strength compared to stock cast flywheels
- Ideal for kart racing and high-performance engine builds
Fitment
- Subaru / Robin EX21 engines
Important Fitment Note: The 6628 billet flywheel is designed for Subaru EX21 engines and is not designed to work with a pull starter. Always verify engine configuration and starting system before installation.
Frequently Asked Questions – ARC 6628 Subaru EX21 Billet Flywheel
What engines does the 6628 flywheel fit?
The 6628 billet flywheel is designed specifically for Subaru / Robin EX21 overhead cam engines used in kart racing and performance small engine builds.
What makes this flywheel adjustable?
The adjustable hub design allows ignition timing to be advanced or retarded without using offset keys. This gives engine builders the ability to fine-tune timing for different camshaft setups, fuel types, and compression levels.
Why upgrade to a billet flywheel?
Billet flywheels are significantly stronger than stock cast flywheels and are designed to handle the stress of high-RPM racing engines. They also provide more consistent ignition timing and improved reliability in performance builds.
Will the 6628 work with a pull starter?
No. The 6628 flywheel is not designed to work with a pull starter. Always verify the engine starting configuration before installing this flywheel.
Is this flywheel suitable for racing engines?
Yes. The 6628 billet flywheel is designed for high-performance racing engines where adjustable ignition timing and high-RPM durability are required.