The most common solutions are: reducing the compression ratio and/or increasing the squish clearance, weighting the flywheel, choking the exhaust or richening the fuel mixture. Targeted mechanical interventions are used to enhance or accentuate some characteristics of the engine, but they are always a compromise that therefore cancel or deaden other characteristics.
In our examples, the motorbike certainly becomes more manageable, but the engine tends to lose power and response that could be useful when dealing with obstacles or steep climbs.
The Power CDI power pack with the Dynamic Power Control seems to be the solution. In fact, it can instantly modulate the engine output by acting on the ignition timing, and making very wide correction at each single round of the engine: the engine response becomes much more manageable and foreseeable as a function of throttle opening.
A practical example will help to better understand the effectiveness of the device. If you go from dry to slippery ground, keeping the throttle in a constant position, the engine rpm may increase causing the wheel to slip, sometimes with disastrous consequences. On the contrary, if the rider abruptly opens the throttle to drift or wheelie to jump and obstacle, the power pack recognizes that the rider is requiring power and does not intervene to oppose the action.
In short, it is like going from an ultrasoft map to an ultrahard one, based only on how you manage the throttle and adding a new dimension: the speed with which one opens the throttle not only the quantity. The system is intuitive in use: on slippery ground, it is natural to open the throttle only slightly and slowly while, on ground with a lot of grip, it is natural to rapidly and aggressively open the throttle.
What to do to install the Power CDI?
Besides replacing the original power pack, the motorbike must have a carburetor with TPS (throttle Position Sensor), if not already installed. Some bikes, like the Yamaha YZ 250 or the Beta 2017 (the Racing too) already have the TPS but on other models the carburetor must be replaced with one that has the TPS. The power pack also works on the original carburetor without TPS but only with the latter all the advanced functions are enabled, such as the Dynamic Power Control, the pipe-bangprevention (that eliminates the annoying “deceleration surges”), the anti-stall, etc.