TRIUMPH 400 93MM BIG BORE KIT BY NMW RACING

Product Overview

The NMW Racing 93mm Big Bore Kit is engineered to significantly increase displacement, torque, and top-end performance of the Triumph 400 engine platform. Designed for high-performance builds, racing setups, and aggressive street applications.

Engine Upgrade Specifications

Base Engine (Stock):

• Engine Type: Liquid-cooled, DOHC, single-cylinder
• Stock Bore × Stroke: 89.0 mm × 64.0 mm
• Stock Displacement: 398 cc

NMW Big Bore Conversion:

• Bore Size: 93 mm
• Stroke: 64 mm (stock crank)
• Approx Displacement: 440cc

 Performance Gains

• Power Increase: +15% to +25% (depends on tuning)
• Torque Increase: +20%+
• Stronger mid-range & top-end pull
• Improved throttle response
  

  Required Supporting Mods (Recommended)

  For best performance and reliability:

  • ECU remap / standalone tuning
  • High-flow air intake
  • Performance exhaust system
  • Upgraded fuel injector / fuel tuning
  • High-performance spark plug & ignition coil