KDX200/220 Jetting Database
Posted 27 February 2009 - 10:47 AM
I don't have any smaller pilot jets on hand. 45 is the smallest I got. I may order a few extra's.
Posted 27 February 2009 - 11:11 AM
If you do drive down let me know and I'll come out and meet up, talk bikes and have a beer.
Posted 28 February 2009 - 05:52 AM
Posted 28 February 2009 - 10:20 AM
this is a jetting thread please go PM
Posted 21 March 2009 - 06:45 PM
700 ft. +/-
modified air box lid - rear 2/3rd's removed
stock 33 mm carb
FMF desert / rev pipe
FMF Turbine core 2 silencer
FRP torque ring
Night and Day over stock , ran lousy with stock pipe and silencer.
Amazed at how much free'er it runs now and has affected the jetting alot.
I've got a 35 mm 200 carb with 607 reeds that I'm bolting on tomorrow.
I'll start with a 158 /42 and go from there.
I've got a new Wiseco piston to put in and with have the head modified for more compression at the same time ,, and clean up the stock porting.
Posted 22 March 2009 - 12:28 PM
The bottom end is still not as smooth as I'd like , will try a 40 slow jet.
A mid throttle this bike has some awesome power compared to the stock 33 mm carb. It will easily pull the front end in 3rd out of a corner.
It's not coughing at low end , it feels like it's gurgling.
Posted 23 March 2009 - 05:28 AM
Idaho: Typically ridden 3000ft - 8000ft, 50F - 95F.....normally fairly low humidity
Mods: Removed airbox lid _ Twin-Air filter _ Stealthy 10oz Flywheel weight _ Kouba KDX2 Links (lowered +/-1.5")
Gearing: 12/47 (considering 12/49 for mtn trails, then 13/49 for high desert)
Main Jet: 152 (from 155, Stock 160)
Pilot Jet: 42 (from 45 _ Stock 48).....may drop to 40
Needle: 1173, clip 2nd position down (Stock at 3) (maybe back to 3)
Air Screw: just adjust as needed, but currently 1.75 out
Pre-Mix: Golden Spectro Semi-Syn 48:1 w/91oct
Posted 23 March 2009 - 05:04 PM
Posted 23 March 2009 - 06:36 PM
id try 155/42 combo, middle clip
Posted 24 March 2009 - 11:15 AM
Yep, that should be close! I am running about the same conditions and am running 152/42/ second clip. I think I can probably go dwn to a 40 on the pilot, since it's still a little rich mid-range.
Posted 30 April 2009 - 07:20 AM
900 ft above SL(temps from 40's to 90's with humidity in summer)
Main Jet 150
Needle Clip in 2nd clip
Air screw 1 in a quarter
40:1 Golden Spectro @94 OCT
Mods: FMF Woods pipe, Turbinecore 2, Airbox snorkle removed, Moose Air filter
I finally have got my bike running really well! With the stock jetting 158 main, 48 pilot with the FMF pipe it was still running rich and spooging quite a bit. I dropped the main dwn to a 155 and pilot to 45 and it was still smoking and spooging too much. The last drops are working well, with very little smoke and just a little spooge running out of back of silencer. I have done a few plug chops and both high and mid range reading look good. Insulator a light tan color.
(update) I think I might be a little rich on in the middle, so I raised the clip to the 2nd clip on the needle, and now my air screw is adjusted to a little less than one turn out to get it from bogging at the crack of the throttle. I might try to raise the pilot jet back up to the 45. Still getting a little oil running off the silencer:
Lasted update: Got rid of my rev pipe and put on a woods pipe. Dropped my main jet dwn to a 150 and it seems I have found my sweet spot, at least for the spring and summer. I might drop the pilot dwn to a 40 and move the clip to #3.
Posted 30 April 2009 - 03:43 PM
yea anything below 150 and the bike started feeking a little flat, i ran a 40pj just fine in mine, but it ran the same with a 42, so i put it back for some more lube. the 38 was too lean, this was winter in az, im sure in summer a 38 would have been ok. when i go up to 7000ft in the summer the bike runs rich, but definatly not rich enough to complain
Posted 02 May 2009 - 12:17 PM
Posted 02 May 2009 - 12:52 PM
Posted 05 May 2009 - 09:02 AM
model- 200 or 220: 2-hunny
conditions where you ride- altitude and temp: 1500-4500' 35º-80º
engine modifacations you have done: RB-Designs modified Air Striker and head reconfiguration, DFIII reed system, TwinAir, Hinson basket, '99 KX250 frontend w/.39 RaceTech springs and ProPilot valving (modified to suit), WER, 12 x 47 final drive, HoH revalved shock (OEM 5.0 spring), FmF -30 (rev profile), PC or OEM S/A...depending, YamaLube 4T, Interceptor @ 36:1.
pilot jet: 38
main jet: 148
needle number/type and clip posistion (clip position is from the top of the needle as it is mounted in the carburetor, top being #1): DEK/4
air screw turns out: 2 1/2 to 2 3/4
fuel: 92 pump octane w/5% toulene and 5% Trick 114
how's it working for you?: Couldn't be better
Posted 07 May 2009 - 06:17 PM
Altitude: 6000-10,000 ft, 50-85º
Carb: RB modded Keihin PWK
Head: RB re-cut squish band
Reeds: Boyesen Power Reeds
Exhaust: FMF Gnarly Desert w/ Stock Silencer
Airbox: Lid removed w/ Twin Air Filter
Needle: CEK w/ clip at 3rd position
Pilot Jet: 40
Main Jet: 150
Pilot Circuit Air Mixture Screw: 7/8 turns out from fully closed
Fuel: 32:1 mix 91 Octane w/ 2T Repsol Synthetic
Posted 07 July 2009 - 09:13 PM
conditions where you ride- 2000-5000 80-110
engine modifacations you have done: boysen dual stage reeds, no airbox lid w/ uni filter, FMF Gnarly Header, Stock Muffler
pilot jet: 152
main jet: 42
Stock Needle and Position
air screw turns out:1-2.5
hows it working for you? Happy so far. Before I had pipe and reeds and went up to 7k ft I just had to play with air screw, but now w/ reeds and pipe I have to drop down my main at that elevation
Posted 23 August 2009 - 05:07 PM
Model: KDX 200
Altitude/Temp: 4000-8000 ft. typical, sometimes up to 11,500 ft.
Mods: Snorkel still in place, Uni air filter, Boyesen Rad Valve (can't remember which reeds), FMF Gnarly pipe, Turbine Core II silencer, Wiseco piston (stock size), stock gearing.
Pilot Jet: 45
Main Jet: 155
Needle/Clip:#1174, 2nd position from top
Air Screw: 1 3/4 turns out
Fuel: pump gas, 91 octane. 40:1 pre-mix ratio.
Comments: Run very, very well from idle to WOT with no sputtering or dead spots. Biggest problem is smoking like an old steam locomotive and spooges like a Hawaiian lava flow. Takes a 1/2 can of WD-40 to clean all the spooge off the silencer, pipe, rear tire, swingarm, shock etc. after each ride. But runs great and amazingly never fouls a plug, even when riding all day behind my son in 1st gear at 1/8 to 1/4 throttle. I'm going to try working my way down to a 152 main and 42 pilot jet to see if that will help with the spooge and smoke.
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