I was going to post up about this carb after I got it more dialed in but seeing how procuring jets is not going to be fast as I thought it would be I figured I would start posting up while it is a little more fresh in my head.

first of all this is NOT a FCR-MX carb, it is a FCR41 Side draft or a flat slide CR side draft, this is the kit for the XR650L that Sudco sells.

http://i208.photobuc...rb/100_2526.jpg

I ordered mine with a choke...it cost extra btw.
anyone see a problem with this at first glance?

http://i208.photobuc...rb/100_2504.jpg

luckily I have long slender fingers and can reach in with a finger and engage and disengage the choke, I read about someone saying they were able to hook up the stock cable to it but Im not going to play with that until I get my jetting set up.

meanwhile, seeing how there is no vacuum lines on this carb I guess it's time to pull off the carbon canister and the smog pump seeing how they are now inoperative without a source of vacuum...

http://i208.photobuc...rb/100_2521.jpg

I still need to get or make a block off kit for the smog pump so it gets to stay on the bike a little while longer...

ah, yes, now onto the tuning...well, for some reason I received NO extra jets with this kit even though a fellow member just bought the same kit as I did a few weeks earlier and received 3 extra pilot jets and 3 extra main jets :confused; :cry: so my initial impressions of the jetting were off and realized after that I am running lean at idle and off idle to just under 1/4 throttle, I have the pilot AIR jet turned all the way in (it's adjustable) and the fuel screw 2.5 turns out and is still lean, I played with the needle clip settings with a little bit of hope that maybe I could clean it up a bit but at that low a throttle the needle just doesn't have enough effect,so now I get to start buying jets...
but speaking of the fuel screw this is what I made to adjust it and as a bonus it works for adjusting my pilot AIR jet screw as well...



there is a more detailed description of my making of the custom screw driver in the Intake - Jetting / Fuel Injection Forum,
luckily I am also able to adjust and change out my needles without having to loosen and move around the carb, it does require a allen wrench with a ball on one end though...

http://i208.photobuc...rb/100_2576.jpg

well, now to wait for new pilot jets and go from there.

So If anyone has any input on the jetting of this carb let me know,

here is how it sits at the moment.
FCR41 side draft, NOT FCR-MX

XR650L 2007
air box snorkel out
Uni air filter
stock exhaust with baffle out-with homemade non-restrictive baffle.(keeps same inside diameter as baffle removed)

350ft elevation but do all my riding at higher elevations-within 25 miles I'm at 2500ft elevation and do most of my aggressive riding at around 3000ft up to 6000ft,

I would like to know if a extended fuel screw will work on this carb,
I would also like to know if a adjustable leak jet kit will fit on this carb? has anyone put either of these on the side draft model? it shares parts with the FCR-MX carb such as it has the same part number for the AP cover for both carbs but they have different bowls.

FCR41 has in it:
main jet 170
pilot jet 50
needle OCEM®-the ® was a couple spaces before the OCEM stamp,does that make it a OCEMR?
clip 4th slot
main air jet 200
air pilot jet set at 0 turns out
fuel screw set at 2.5 turns out

would like to get a 52 and a 55 pilot jet and a 165 main...

Your carb is also known as a "horizontal". It's pretty much the same carb that comes stock on all the 4 stroke KTMs - except that most of the KTMs use a 39mm, you got the 41mm. Nice call.

Where's all your vent hoses? There should be 4, plus one small bowl overflow hose. Here's a picture of mine. I just happen to have it off the bike right now. (I know my accel pump shaft is out, I just put the bowl on real quick to do a thorough cleaning)



Good luck with your jetting.

Here are some jetting resources.
http://www.motorcycl...age_W46C560.cfm

http://jetsrus.com/F...ow_to_rejet.htm

I have one on mine, and the Sudco jetting was waaaay off. I think I am in the 145 range for main, forget on the pilot. Contact "Burned" here, he gave me specs that were dead-on.

How did you get a choke? Wish I did that!!!!

BP

jjast said:

how are you deciding your jetting is lean? i have a FCR-MX 40mm on my XRL. live at a 1000ft ride up to 4000ft and my jetting is, mj 168, pj 45 , and mine runs great.
for the choke knob, i found a piece of rubber hose that fit snugly over the knob to lengthen it. the hose comes out just under the gas tank and i can just reach down to pull it on and push in for off, works great.

Hot tip.

Keep your oil seperator when you de-smog it.

It keeps your airbox from getting full of oil

and dripping that oil on the floor.

Some of us wish we still had ours.

akarob said:

the white arrows point to the ONLY two vent lines on this carb and there is NO overflow...I thought that was odd also.



also thanks for the jetting resources, :banana:

NW ADV said:

I had read from another member that it was a option to get the choke, you just have to request it with your carb when ordering, it doesn't show up as a option when looking at the kit.
I went through a dealer where I get 10% off and just instructed him to be sure to request the choke when he ordered it.(its going to be $63-$82 more depending on who you talk to) the 10% off just about covered the extra cost of the choke.

zx12r said:

"how are you deciding your jetting is lean?" -because first the bike was surging horribly when I putted out of the driveway, then the idle would hang when I let off the throttle,the bike was falling on its face off idle to just under 1/4 throttle, when I increased the fuel screw the bike ran better and then after turning in my pilot AIR jet the bike ran even better, but didn't clean it up, I have only been riding around town at 350ft elevation and I bet the bike would run better at higher elevations unless the main jet was too much...hence the ongoing tuning of this carb, but thanks for the idea of adding the rubber hose to the choke knob as I thought of this as one option and it's good to know that it is working successfully for you.:ride:

Bob K said:

+1, already was planning on keeping it but thanks for backing up the idea :banana:

Since we are on the subject I noticed that Akarob carb had throttle cable holders like what is on the stock CV carb and that is what Sudco really should have incorporated into this carb kit, the bracket that is on the carb now is threaded and the motion pro cables aren't really made to spin inside the housing so its a slow and tedious process to carefully spin the cable out and to disconnect the cables from the carb require disassembling the throttle tube pull cable then rotating the throttle tube so you have enough play in the push cable so you can thread out the cables on the carb because the cable is too short to be able to un-thread it otherwise, (hope that makes sense) and speaking of throttle cable holders Sudco really should use bracket no.021-133 as opposed to 021-134(Sudco catalog) for a better angle for the throttle cables.

you can see in the back ground the Sudco carb bracket mounted on the bike as opposed to the stock carb cable angle.

Just an FYI, if you have your FCR jetted right, there is absolutely no need for a choke. I live in the far north of Canada, and I've started my FCR aspirated XR650L in temps down to -10°C with no problems. Since the FCR has an Accelerator Pump, all you need to do when it's cold is to turn up the idle screw three turns, whack the throttle WO three times and hit the magic button and it'll start right up. After three or four minutes (once it's warmed up a bit) you can turn the idle back down. :cheers:

I don't have all the vent hoses like everyone has,: on the fcr 41mm on the LC4:excuseme:

IM hoping this thread gives me all I need to put it on the redwhiteand blue pig.

rockraven00 said:

Neither do I. Those 50,000 vent hoses in the pics are only on the FCR-MX, the original 41mm FCR only has two hoses that come off the top of the carb. :cheers:

jjast said:

Your numbers do look rich.
Here are the specs for my FCR-MX41:
Main Jet=165
Pilot Jet=42
Starter Jet=72
Needle=NJGR
Needle Clip=second slot from the top
Mine has both the adjustable leak and the fuel screw. Not sure if they would work on the non-MX carb though. I do use the choke on mine.... keeps me from having to mess with the idle. I have a collection of pilot jets (45, 48, 50 & 55)... if you need them let me know. I'd be willing to mail them to you as long as you replace whatever you use and send them back. I also have four mains, but they are all richer than the one you already have.
My rides begin at about 2500 and go up from there. Carburetor seems to be pretty close to dead on.

akarob said:

NO...that's the older style first or second generation FCR(now on third generation) w/ removable bell. :smirk:

all of the newer(04 or 05 and up) KTM 4-strokes use the FCR-MX third generation...u can get a 41mm or have the 39mm bored out.

i'm kinda suprised they still sell those w/ the exposed AP shaft and throttle cables...or did it come with a plastic throttle cable covers?

akarob's jetting should be close to urs.

there's a bunch of gud info for that older carb on the KTMTalk carb and jetting board, see the stickies on top.

BUT once u get the jetting close u need to make sure the squirt is not hit'n the slide(shudn't w/ a new carb) and get the duration down to about one second for offroad.


:cheers:


P.S. looks like at least a few 2012 KTM will be FI... :eek: ...i'm oldskool :busted:

ThumpNRed said:

Thanks for the offer ThumpNRed, I might take you up on trying the 55, I'm going to do some checking around then I'll get back to you,:cheers:

Kenzo said:

That carb I posted is off my 2002. It does have a plastic cover for the cables, just not installed in the photo.

I have it apart for cleaning. There was a massive amount of dirt in my fuel line and it's not from the tank. It basically plugged the line and came out in clumps. The only other place it could come from are the vent hoses. I'm chalking up to the previous owner. If it happens again, I'll take preventative measures.

akarob said:

not uncommon, also inspect and clean the top of the carb above the slide...many with the FCR carbs swear by the vent line filters for engine longevity by preventing dust entry. :smirk:

there are several manufacturers of filters or some "roll their own".

i haven't installed them since i bought the bike used but you better believe when i spend the money to fresh'n up the motor i will be installing vent line filters. :thumbsup::thumbsup:


:cheers:



http://kevinscyclera...dcarburetor.htm

7602 racing has them also

I was able to dig up some jets so now I have a 55 pilot and 155,160,162,165 mains to play with,

FYI-the FCR side draft and FCR-MX do NOT use the same pilot jets.

FCR SIDE DRAFT:


FCR-MX:

Yea, the MX and "downdraft" models are different. Most people have the FCR horizontal.