KDXRIDER.NET

Ive got a 1990 kdx that i recently purchased at a good deal. I found a few probs after i got it like a cracked carb boot and both left and right valve were stripped. anyway getting all those probs took care of and need to find a good baseline to start with on jetting.

The bike
1990 KDX 200

Mods :
Boyeson 607 reeds
Modded stock pipe
FMF muffler
open airbox modded to keep the regulator mount

Ride mostly between 2500' and 5000'
60 to 70 degrees F

Oh not sure if it matters but the locality is NE TN NW NC

Where exactly are you? In in NW NC, about 15 minutes from the state line on 421.

Anyway, what jets have you got in there now? 155/45 is generally a safe starting point. 152/42 might be closer, but it's safer to start a little fat and work your way down.

Julien, I live in Roan Mtn TN. Work near Boone. Thats what kinda made me think i need to start over. It had 150/48 and a 1172. It was smoking alot. Sounds like we arent far from each other maybe we can get together and ride sometime.

try a 45 or even 42 pilot. That main ought to be real close. You aren't burning tranny oil, are you?

Yeah, I live just outside boone on 421, and work at the hospital. I sadly haven't even had much chance to ride this summer. Work is work, and kids are kids. I really need to get out a few times before the snow comes.

Cool, I work at Seven Devils. I dont think i am but do have a really bad leak from the tranny around the sprocket i ordered a new seal for it and the shifter when i ordered the new valves. I hope to get mine back together soon. Whats your suggestion on a needle jet?

For the E series, the CGK/DGK needles are the way to go. The CGK has more of a hit to it, and the DGK is very smooth. Both have a better overall profile for the KDX than the stock 1173 kawi needle. I would recommend getting both, and trying them back to back. The CGK can be a lot of fun for a little while. For long tough trails, the DGK is a lot easier to handle. You will certainly need a smaller pilot with either of those needles.