Originally posted by 400ex men
the CDI will give you about 2hp
2HP!!!!!!!!!!!!! If you could get 2hp from a cdi everyone would have one. No they do not boost hp. And truthfully unless you have a built engine they are pointless. Why because your stock engine stop making power after about 7000 rpm after that you start losing horsepower. Therefore there is no reason to raise your rev limit to 10000 rpm. Because if you are riding the stock rev limit of 9000 rpm then you don't know how or when to shift. The ideal point to shift would be once your power start to fade which is just after 7000 rpm. A lot of those boxes advance timing. That causes your engine to have problems starting. The only way you can guarantee your engine will start is if the battery is fully charged. It is way more of a pain than it is worth. I have a fully built 440 that has more power than the majority of 440's on the market and I still don't have a rev box, i did use too though and I hated it being a pain in the a** to start. Plus I shift before 9000 rpm even with my built bike although i could take it to 10000, but my bike's power starts to fall off at 8000, i'm usually shifting between 8000 and 9000. So stay away from the rev box. They are pointless.
2001 Duncan Racing National 440ex
Power Cylinder 4000 12:1 JE
web cam 463/9i, port & polish, 3 angle valve job, hardend rockers, titanium valve springs.
Duncan Racing Fat Boy 4 Exhaust
1mm oversized blackdiamond intake and exhaust valves
15 point gusseted frame powder coated candy apple red
Doug Eichner Signature Series Edelbrock Carb
Procom CDI ignition
Hinson Basket, Removable Side Case
Sparks 8 plate clutch
Custom graphics and seat cover
Custom air intake with K&n Filter
everything is polished and billet
Roll Design chrome swing arm
Elka dual rate ssd with LT linkage
TCS ZPS, douglas ultimate billet beadlock wheels with Maxxis Razr's
Roll +1.5" chrome anti vibe stem with Tag T-2 oversized bars cr hi bend
Herrmann arms Trail Tech HID Lights w/ custom billet mount (for the dunes)
Overized UM vented oil tank FST oil cooler kit and even more