MSD 4253 Enhancer Ignition, 650-701 Yamaha Instructions

Below you will find brief information for Ignition Enhancer 4253. The Ignition Enhancer is a direct replacement for the stock CDI unit and improves low end and mid range while maintaining top end performance. It includes an adjustable Rev Control and an engine protecting Holeshot/Engine Overtemp RPM Limiter.

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Ignition Enhancer 4253 Installation Instructions | Manualzz

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Key features

  • Direct replacement for stock CDI unit
  • Increases spark energy
  • Adjustable Rev Control
  • Engine protecting Holeshot/Engine Overtemp RPM Limiter
  • Improved low end and mid range performance
  • Maintains top end performance

Frequently asked questions

The Holeshot feature limits the engine rpm at approximately 3,200 - 3,600 rpm with the throttle fully open, providing more consistent holeshots.

The Overtemp feature limits the engine rpm to approximately 3,600 rpm if the engine reaches a damaging temperature.

Loosen the locknut on the potentiometer shaft, turn the shaft clockwise to increase the rpm limit or counterclockwise to decrease it, and then tighten the locknut.

The adjustable Rev Limiting function of the Enhancer Ignition is pre-set at the factory at 8,000 rpm.
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