Well, I just had the opportunity to try the 06 CDI on my 08 yz450f. My initial reaction was
, followed by
. The first thing I noticed is how much easier it breaks the rear tire loose, even moderate applications of throttle caused the tire to spin significantly more than with the stock CDI. It's noticeable how much harder it pulls, it pulls harder than before at lower RPM's. I went to try out a section of hillclimbs with deep hard-pack whoops, it climbed beautifully and effortlessly. From there, I went to ride some black diamond single track trails, with sections going up, down, and parts full of loose rocks, along with some areas that call for lower speed. The surprise there was how much grunt it had right off from idle, trails like that used to required some clutch action to keep the engine from stalling, but now there was NO clutch slippage necessary, the bike just kept chugging along with minimal throttle application. My jaw pretty much dropped by how much the engine could be lugged in the slow areas. I'd rate the combination of the 08 yz with the 06 CDI a 10/10.
It's the best $40 I've spent in a long time.