98 KDX200 Jetting.

[DragRacer383]

Let me introduce my self, I'm Glen.

The Bike in question isn't mine.A guy I know just bought it. It runs great. He wants it to put him on his ass though I guess. So He got a hold of me. I study up on stuff before I just tear into and mod it. I have went through the mod section,and jetting section.,even searched. so here i am. Starting with stock.

This is the plan. Drop one tooth on the front sprocket.
Boyson reeds,Pro circuit platinum II exhaust, Air box lid removed or modified.

I am planning on using the CEL needle, I would like your best guess on what Pilot,and main jets to start with and what range I should have on hand. BTW 300-350' ASL (elevation)

Also I didn't search this. How much could I mill the head if I wanted to run 100 octane gas safely.

 

[DragRacer383]

Is it the CEL needle that is throwing this off?
I figured some of you were running it.

 

[RickSA]

CEL's work well but jetting is unique to your bike, conditions, oil to fuel ratio style of riding and a stack of other things!
With my FMF woods pipe, airbox lid off, pro-lite piston and vforce 3 reeds
I run a CEL-2, PJ 42, MJ 150, AS varied depending on temp, at 1000feet and +-60F

Have a look here it helped me allot in the beginning when jetting was still "black magic" to me!!

http://users.conwaycorp.net/virtus/page2/speed/jetting.htm

 

[RickSA]

That link looks a bit wrong! If it doesn't work Google "Spanky's Jetting Guide"

 

[virtus]

Jetting links

The jetting guide changed location on the same web page. The link above should work.