WAI 31413N Starter

Starter Overview

WAI 31413N is a new starter built for modern BMW and Toyota applications that require reliable cranking performance and proper amp output. It uses a permanent magnet gear reduction design with a pad mount and clockwise rotation for direct application matching.

Compatible With BMW 840i, Z4, X3, X5, X6, X7, 540i, 740i, M2, M3, M4, M240i, M340i, and M440i applications, plus Toyota GR Supra applications. This starter is also a fit for the BMW 840i xDrive and related Gran Coupe applications listed in the fitment data.

• Permanent magnet gear reduction design for efficient starting performance
• 100% new construction, not remanufactured
• Pad mount configuration for application-specific fitment
• Clockwise rotation and 14-tooth drive specification
• 1.7 kW power rating for demanding starting loads

Detailed Application Notes

The WAI 31413N starter is engineered for vehicles that need consistent electrical output and dependable engagement during engine start. Its DENSO family design and proprietary manufacturing process support long service life while maintaining the fit and function expected in BMW and Toyota starter replacement work. This part cross-references Gates 31413 for the same application.

Common Replacement Reasons

• Engine cranks slowly or intermittently
• No-crank condition with a charged battery
• Starter engagement noise or weak engagement
• Electrical starting issues on high-demand vehicles

Installation Notes

Verify the starter rotation, mounting type, tooth count, and application notes before installation. Confirm the vehicle’s original starter specification matches the pad-mount, clockwise-rotation configuration shown here. Use the fitment table to confirm the exact BMW or Toyota application before ordering.

Quality Assurance

WAI states that this starter is 100% new and manufactured with proprietary components and processes to support maximum life and performance.