new woods pipe

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Apr 1, 2003
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#1
OK, I got my new woods pipe installed today. It went on easy. Seems to be built well. Fit up well enough. Sounds good. Only slightly louder, but much crisper sounding.

It has a much improved mid, with no loss on top. I auctually seems to come on a few hundred RPM later of the bottom though. No doubt due to my lack of jetting greatness.

Question time.
(*Disclaimer* I have no good area for a plug chop, and test by feel. I am good mechanically, but fairly new to dirt bike carbs. I have a long history of modding PWC) It has 45, 155, 3rd clip in it now. Airbox mod, pipe, silencer only.

At walking speed, in second, if I gap it, it is soft just for a second. (again, it feels like the band starts a bit higher that the stocker). Half throttle and below is quick and clean.

Now, looking over the options, FMF's site says to use the jetting I am now, but to use a R1173K needle in place of my stock R1174K. I'm not sure what this will effect????

My gut says to try one size lower main, (as the site references a 155 or a 152 for my application), but in my ignorance, it seems to me, that a aftermarket pipe would flow better, processing more fuel on the main, not less.......

I only think of the main because, if I'm going slow in second, and want to lift the front quickly of a log or rut, if I gas it too around 1/2 throttle, it seems to pop cleaner and quicker than if I gap it full.

Anyway........ should I try a smaller main first, move the clip position first, or try the new needle first. Thanks for your help. I tried to gather all the info I could before I wrote all the blabber.
 
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#2
One other thing, I already was running the 45 pilot, 155 main, 3rd clip before the pipe install, and the bike ran great. Common sense tells me a pipe would make the bike a bit leaner if the jetting stayed the same, right?

The problem isn't TOO bad by the way. The bike is rideable as is. Just want it to be right.
 
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#3
What year? What size? Check the plug!! If your getting a bog when you crack the throttle you might be a bit lean. Happend to mine. (03 kdx 200 airbox mod and boysen reeds) I also put the woods pipe on mine. I just moved the needle clip down one and was good to go.

good luck
 

KDXFreestyle

Damn Yankees
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#4
hmm.. that brings up a question for me then... if my bike seems to be boggy a littl ehwen my throttle is cracked, could my bike be running lean? I have a 2003 KDX 200

FMF Power Core 2 silencer (packing seemed to be spoogy when I checked it), Stock jetting, airbox mod, 13/47 tooth sprocket combo, and a NGK b8es plug (which is black and tan)

Thanks
 
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#6
Sorry. It's a 03 200, FMF -35 woods pipe. Air box mod. FMF silencer. Motul 40:1

I tried a 158 main today. Seemed a bit rich, so I'll go back to the 155 and try the new needle. Here's the problem.

FMF's site a 1173K needle for every recent year 200 except the 2003, for which they recommend the the 1173L. (there needle of choice for the 220). Since the 200 is unchanged, I wonder if it is a typo on there site??????

Should I use the L or K needle?
 
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#8
I had the same problem with 01 220,did air box woods pipe turbine core fmf other than that stock.klotz techniplate 32:1etc. throttle response would stumble at low rpm.rideable but very annoying when needing to lift front wheel at slow speeds.when temps where below 60f it would run better.leading me to believe it was rich at low speed.throttle chop at low throttle position several times confirmed this.changing pilot jet down 1 size from stock [dont remember # im at work screwing around here and dont have access to my bike notes]helped out alot.after that was complete did wot chop only to find a lean condition.bumped main up 1 size over.again big difference did away with flat feeling up top. needle position changes with temp.70 or above 3rd from top 70 or below 2nd from top. around 55f move back to stock pilot
 
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#9
made mistake in last sentence above 70f use 2nd from top below 70 use 3rd and 1000 ft above sea level.
 
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#10
Since I only feel the bottom end weakness when I'm at walking speed, and I quickly give it FULL throttle, I assumed that was the main jet. Even though the ngine speed is low, the throttle position is full. That is what determines what circuit I'm on right???

Thank you all for your help and comments.
 
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#11
Drop your needle to second clip from top. If this does not do what you need, then try one size leaner on pilot. I think it sounds like too rich coming off the pilot circuit. Good luck.
 

KDXFreestyle

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#12
663... would this be the same with a 200? my bike falls flat on top, as you say yours did, and it boggs if Im in 2nd.. going about 5 mph, mabey 10, then just pin it.. it seems to have a slight bog. I think im mixing at 52:1 gas mixture ratio with 93 octane. thanks
 
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#13
i know the 200 is a slightly different animal however the carb/pipe theory of operation is the same.i'm sure you have read all do's and don'ts about fuel etc.but 52:1 sounds very lean fuel/oil mixture,not to be confused with fuel/air mixture.52:1 will make f/a mixture very rich.initially i figured my problem was related to excessive air box vacuum.method of proving this right or wrong was to remove lid all together and air filter [just a couple minutes for testing ] changed trouble slightly,not enough to make it feel spot on.so on to next phase was pilot jet.the idea that it was too rich bog and not lean bog was the puff of smoke it would emit for a second or two after slow speed ride then fast twist on throttle when the engine could burn off excees fuel.I just assumed the flat spot up top was a virtue of the pipe and it is to a certain extent,however after pilot thing was sorted out the flat spot got bigger thats when did wot check,found lean etc.and now bike pulls much harder up top as well.one last thing and i promise to quit rambling,with the stock pilot bike would cold start on 80f day w/o choke again pointing to pilot/rich thing.with the kdx wonderfull front end the stumbling engine is just a ton of fun,is'nt it ?
once cleaned up you will be pleasantly surprised.each bike is different use it for w.i.w.
 

KDXFreestyle

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#14
so I should mix my gas to say... 40 to one, or w/e th emixture is with golden spectro? (4 gallons to 1 bottle instead of 5 gallons, which is 52:1)
 

wanaride

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#15
FWIW, I have an 03 200 and I have the same flat response when moving slowly in 2nd gear and I rip open the throttle; I've been working on the jetting since July when I bought it and it's still not "there". Main=152, pilot=40, needle=3rd from top, AS variable, airbox mod and stock pipe. I twist the throttle open and there is a delay of about a second before the revs start to build. Based on what I've read, I still think I'm running rich, but to tell you the truth I'm not really sure.

The engine rev response is delayed (in 2nd gear, slowly moving, and I rip open the throttle) until I get the AS to 2 turns out, then I hear the "booh-wah" and it sounds like the engine is going to die, so I presume I'm too lean at that point (and too rich from AS=0.5-1.5 turns).

I have read many reports of "Oh yeah, my stock bike goes vertical when I twist the throttle open in 2nd gear", but try as I might, I just can't get there.

I ordered the FMF woods pipe and TCII silencer but have yet to install them. If I figure anything out that is useful, I'll let you know.