Please help, i have a jetting question

[kdx220freak]

hi, i just got my bike a few months ago and i put the stock pipe back on when i got the bike. little did i know that he had the carb jetted for the fmf. Now i have to completly clean my carb. well the stock stuff is way differnt than what i got. The stock main jet is 160 i got 155 and the stock pilot i think is 42 and i got a 48. Does this sound like the correct jetting for an fmf pipe. Also if i take the snokel of my airbox to get better airflow, will i have to buy more jetts, if so which ones should i buy. Also does anyone know like the cheapesy place to get a top end rebuild.

 

[the trail rider]

way off

you should have a 42 pilot and 142 or 145 main. the jet sizes you said were something like for the 35mm off the kdx 200. you are running way rich.hope that helps.

 

[NM_KDX200]

Straight from the FMF site, adjust for your altitude:

We developed these specs with a 32:1 fuel to oil mixing ratio of a 50/50 mix of race fuel and super unleaded, 0 - 1500 ft altitude at 70 degrees outside temperature.
Your choice: KAWASAKI --> 2001 --> KDX220R

Jetting Information
Main Jet: 145-148
Pilot Jet: 42
Needle: R1173L
Needle Position: 3RD
Power Jet: N/A
Air Screw: 1.5
Fuel Screw: N/A
Comments: Remove airbox lid snorkel
See: http://www.fmfracing.com/jetting_center.aspx

 

[kdx220freak]

why is my jetting so high then???? i really am kinda confused.

 

[Green Hornet]

What is the jetting setup? Numbers Please
This is the STOCK JETTING CONFIG:
220-42 Pilot, 1173 Needle, 145 or 148 Main
200- 48 Pilot, 1174 Needle, 160 Main
What u got??
This is Canadian Dave's Recommendations:

1995 to 2003 KDX200

Stock -Run the stock R1174K jet needle in the second from the top clip position, 45 pilot jet, 155 main jet and fine-tune the pilot circuit using the air screw.

With a performance pipe/expansion chamber, the air box lid removed and the stock or a performance silencer run a 42/45 pilot, R1174K jet needle in the mid clip position, a 152/155 main jet fine tune the pilot circuit using the air screw.

1997 to 2003 KDX220

Stock run a 42 pilot jet,the stock R1173L jet needle in the second from the top clip position, a 142/145 main jet and fine tune the pilot circuit using the air screw.

With a performance pipe/expansion chamber, air box mods , the factory or after-market silencer and the stock 33mm carburetor run a 42 pilot, the stock R1173L jet needle in the second from the top clip position, a 145/148 main jet and fine tune the pilot circuit using the air screw.

Same as above but with your carburetor bored between 35 and 36mm or running a 1988 to 2003 KDX200 35mm carb jet according to 95 to 2003 KDX200 requirements.

Addition of Boyesen reeds or a Boyesen RAD Valve will require you to lean the pilot and main jet one size and readjust your air screw.

 

[kdx220freak]

my pilot is a 48 and my main jet is a 155, does this make sence for a kdx220?

 

[Green Hornet]

my pilot is a 48 and my main jet is a 155, does this make sence for a kdx220?

Do you have a 35mm carb on it??
Then it would make sense

 

[kdx220freak]

i will go get the carb id. Im really not sure if i got a 35mm on there cause i bought the bike from a guy a few months ago.

 

[kdx220freak]

the only numbers that i could find on the carb, were

PWK
V981 A015

thats all i found it was on the side right above the bowl.

 

[lepper]

Measure the thing already....

 

[kdx220freak]

i dont really have anything to measure it with. ANd i would not know were to measure

 

[lepper]

Measure the mouth pointing toward the motor. If you have a tape measure that has metric measurements or get standard measurement then you can get on the internet to convert it.

33mm is 220
35mm is 200

 

[kdx220freak]

ok i will do it right now. brb

 

[kdx220freak]

well, i got like a slight bit over 34mm. Im not sure how accurate it was though cause, it is circular and i was using something flat to measure the length. Then i used a ruler and got a little over 1 and 3/8 which came out to be 3.995mm. SO im guessing i have a carb from a kdx200? Is there a way to tell if the carb was bored or just switched?

 

[kdx220freak]

i didnt mean 3.995mm i meant 34.995mm.

 

[lepper]

Most will not bore it without having a plate put in the other side. More than likely it's off of a 200. Your jetting is probably close for the carb. I'd drop the main to a 152 and put the 42 back in though.....

 

[kdx220freak]

My mods will be a pipe, and silencer, modified air box, and reeds. What do you think i should have my jetting at??

 

[lepper]

I have all that and more, I'm running a 150 main and a 40 pilot. What elevation are you at... it makes a difference. 152/42 would be a good starting point. Some would have you start at a 155/48 or 45 combo but you'd just end up dropping down....

 

[kdx220freak]

hmm im not really sure, i will check my elevation and get back to you. Anyway the stock pilot is 42 right? why would you reccomend chaning it back to a 42?? Any help would be great. Also do you know what the pilot jets do verses the main jets??

hmm, i wonder if my motor is from a kdx200.

 

[lepper]

Pilot controls 0 to 1/8 throttle and overall, needle from 1/8th to 1/2 and main the rest. Are you having problems right now? And in what range?

 

[kdx220freak]

according to this map i am like about anywhere from 500-2000ft above sea level.

evation map here

 

[lepper]

The needle and air screw also affect things.... just depends on what problems your having...

 

[lepper]

The higher the elevation, the more air you need to put to it. If you run on the lean side then you can use the airscrew to adjust for the changes. Smaller jets means leaner.

 

[kdx220freak]

well here is how it all happend. I got the bike like in july. He had an fmfpipe and silncer on the bike. He also gave me the stock pipe. I was not very experienced at riding at that time. So i put the stock pipe on without knowing i had to rejett my bike. It ran ok, but it smoked alot. Only when i was racing my friend did it kinda slow down smoking. Anyway, i was warming the bike up and it starting to sound like the piston was slapping, before i could turn it off it stalled. So i pulled out the plug and it had about 1/8 of carbon and oil all over it. So i put a new plug in and it ran great. But i only ran it for a few seconds. Well, i pulled the kips valve off and there was a ton of sluge, so right now i am dismanteing the top end the clean and rebuild it.

 

[kdx220freak]

so at my elevation i should make my pilot like a 44 or something to start or would you reccomend a 42 cause of the reeds and pipe and modified air box.