We have tested this CDI for some time and have found the 2 switch position both work very well, one is more responsive and the other switch position gives a wider and more flexible power band which in this case is a real winner and has proven to be very popular
The HPI cdi for the Yamaha YZ125 is a 2 curve unit which you can change between the curves while riding via a handle bar switch,the unit come pre programmed with power improving igntion timing,you can purchase the programming equipment if you wish to re work the curves to suit your engine tuning,this is not normally required
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