RELIABILITY: Built to meet or exceed OEM specifications for long-lasting performance in demanding outdoor power equipment applications.

Key Features

• ✔ Direct fit for 16-18HP Twin Cylinder engines
• ✔ High-grade copper winding for maximum conductivity
• ✔ Heat-resistant casing prevents premature failure
• ✔ Precision spark timing for improved fuel efficiency

Technical Specs

Type	Armature-Magneto
Air Gap Spec	0.010" - 0.014"
Hole Spacing	~58mm (C-to-C)
Engine Config	L-Head Opposed Twin

Engine Make	Model Series / HP	Notes
Briggs & Stratton	400400 to 422700	Twin Cylinder Engines
Briggs & Stratton	16 HP & 18 HP Boxer	Opposed Twin Configuration
John Deere	Various Ride-on Models	With B&S Twin Engines

Is this a genuine original part?

This is a premium quality aftermarket replacement part from 4Drive, manufactured to meet or exceed original equipment (OE) standards for fitment and performance.

How do I know if it is compatible?

We recommend checking your engine model number on the blower housing. This part is designed for the 16HP and 18HP horizontal/vertical twin cylinder L-head engines (Series 400400-422700).

What is the correct air gap for installation?

The recommended air gap for these Briggs & Stratton twin cylinder armatures is between 0.010" and 0.014" (0.25mm - 0.35mm).