HONDA IGNITION IN TEN EASY STEPS are a 15-year-old gamer
made on “graph mode” or the “number of percent” mode, while the “3D graph” mode allows you to visualize your changes. In “number of percent” mode, the precise throttle position and rpm at which you are making an adjustment can be fine tuned. (We made changes to the ignition map at 2500 rpm at 15 percent throttle.) The “graph mode” will reflect any changes when you want to see your adjustments at each throttle position respectively. ( 5) Choices. How much of a change should you make? The sky’s the limit, but we recommend only advancing or retarding the ignition one degree in any given field to begin with. If you feel the change is too much or not enough, narrow or broaden the throttle and rpm range at which you make the change before you advance or retard the ignition further. As for fuel mapping changes, there is a translation index to go from jetting to mapping: one jet is approximately equal to three percent. Jets roughly translate to throttle openings as follows: 0-25 percent is the pilot jet, 25-70 percent is the needle, 70-100 percent is the mainjet. Use your old-school carburetion experience to help get you started in visualizing and making fuel adjustments, but don’t let it confine you. This system is far more precise and advanced. On a standard bike, a one to two percent mix- ture ratio adjustment is plenty. ( 6) Focused changes. What should you adjust? Ignition mapping adjustments are more effective on the stock ’09 CRF than fuel mapping adjustments. In MXA’s multiple mapping endeavors, our goals were to mellow out the initial power delivery of the ultra-responsive CRF and to lessen the flat-as-a-board feeling on top-end power. After about ten different maps, we were very successful in eliminating the jerky hit off the bottom that test riders didn’t like, but could never make any significant power gains from 8000 rpm up. Don’t get us wrong; with the PGM-FI tool we could change the powerband, but the changes weren’t earth-shattering. We did succeed in getting rid of the irritating bark off idle by retarding the ignition one degree (-1) at five percent, ten percents and 15 percent throttle openings in the 1800 to 3500 RPM range. The benefits of fuel mapping adjustments are min- imal until significant engine modifications, exhaust pipes, etc., change the need for fuel delivery.
We made the most adjustments in the “IG” Map (number
of percent)” mode.