Description Brand new aftermarket high performance CDI box Our part is a Plug-and-play unit, direct fit, and easy to install. Enhanced timing curve, increased limiter (approximately 1000 rpm) Higher grade of electronic components. The Quality exceeds the OE equipment products shipped are tested Please check pictures for more details Fit For VEHICLE MODELS FITMENT FOR: For YFM 225 For Mo-to-4 -- 1986-1988 For YFM 250 For Mo-to-4 -- 1989-1991 1986-1991 REPLACEMENT 59V-85540-20-00 59V-85540-21-00 59Y-85540-21-00 SPECIFICATIONS Key Features Dimensions: Height: 30 mm Length: 55 mm Width: 50 mm Other specifications: Number of plugs: 3 Number of pins: 11 Please note that: The only real way to test your CDI box is to swap it out with another known good unit from the same year/make/model. Because of this, we recommend that you rule everything else out before replacing the CDI box. INSTRUCTIONS Our CDI may use a different wire color code then your original. of the wires are installed in the correct order; please do not change any of the wiring configurations. This CDI is designed as a direct plug-in replacement and should be used as such. Installation instructions not included, Tool not included. Package List 1 X High Performance CDI Box for YAMAHA YFM 225 250 For Mo-to 4 1986-1991