Kx200x wrote: 12:48 am Sep 27 2025 I ordered this cdi box from Jaguar and if your serious about your kdx it will make a significant improvement. I have a 99kx125 E series hybrid. 36.5mm pwk with homemade divider plate, boyeson reed cage, and a platinum pro circuit pipe from an h series with kx 250 silencer, 08 crf450 coil. I like riding MX and single track woods loops. I had a 2018 beta 300rr race edition as my last woods bike and you could be chugging at close to idle and when you opened the throttle fully it wouldn't hesitate. It would just pick up and go without spinning the tire unless you got on the pipe. After installing Jaguars cdi the bottom end had a substantial improvement and I noticed the same effect. I could be crawling through a tight section in second and just open the throttle full and the bike wouldn't hesitate just got moving. I also felt it helped the midrange and top end as a trail I was previously ringing it out at the top of second I was now in 3rd gear in the midrange and It pulled very well. With the switches that adjust the timing to retard it at higher rpm I noticed it definitely picked up some over rev and could hold a gear longer. Seemed to provide a stronger spark as well because when I went to shut the bike down I let off the kill switch when it would have normally shut the engine off but it started back up so now ive got to hold the kill switch down longer. If you have the newest kdx your cdi components are 20 years old. Lost of advancements have been made in electronics over the past 20 years. Definitely recommend getting one if you love your kdx you will be glad you got it.
Thank you for your report back on that. That's about what I expected to hear, although I believe it's LESS of a performance increase going from the E-Series CDI as the 200E CDI has more initial advance than the H-Series CDI, so this is pleasing to hear that you're boasting about such a significant performance increase over the KDX200E CDI
I'm curious if you are also running the 1999-ish Honda CR ignition coil upgrade as well?
Jaguar recently began upgrading some of the output components in his CDI to better handle the higher output of that Honda coil which has the same mounting pattern distance as the KDX coil. I picked up one of these to run on mine when I do a major rebuild hopefully this winter now. I'll probably order another also.
