If you use the Digital CDI, start the ignition timing at .85mm btdc. I like the Digital because it advances and retards the timing more than analog systems. This means a wider powerband on 250's and 125's. 500's probably do not benefit as much because they do not turn enough rpm to benefit as much from the retarding of the ignition at high rpm. Retarding the ignition increases the exhaust temperature which makes the pipe act like it is shorter. This increases rev out. Some big displacement engines may not rev to the point that this effect occurs. The digital ignition retards the timing at kicking speed to just about eliminating kit back. It then advances timing up to about 3800 rpm up to about 22' . This improves low end and acceleration.
If you run the Analog CDI, start the timing at 1.80 mm btdc. The Analog also works well and is generally used on larger displacement engines. The Banshee however also uses an Analog PVL ignition and it works amazing. In some case you may see slightly more peak hp with the Analog PVL on the TXR 250. Usually the digital is less sensitive to timing, less likely to have detonation and gives a wider power band. PVL also offers bolt on flywheel weights. You really can't go wrong with PVL in my opinion.
