This is our "Red Box" MX Performance CDI, specifically designed for MX use. Improves throttle response across the powerband while at the same time eliminating the rev limiter found in the stock Honda CDI. Best suited for 88cc+ Motors, but will work with the 50cc motors. Easy to install - just plug and play.
Works on the 88 and newer Z50R and XR/CRF50's, XR70, CRF70's