need suggestion: jetting FCR41 on XR600@644cc



7 replies to this topic
  • atreiou

Posted January 15, 2004 - 07:23 AM

#1

anyone have suggestions about a good jetting of an keihin FCR41 flatslide carburetor installed on a '94 XR600R with 644cc, worked head, and open exhaust ?

my local dealer say:

needle: OCEM R
slow jet: 50, 52
main jet: 168, 170, 172 or 175

too much items to buy...
something more exact ?

  • michaeln

Posted January 15, 2004 - 08:09 AM

#2

I have my FCR41 set up this way on a '98 XR650L with snorkel removed, smog removed, UNI filter, WB E-series can with 12 discs and WB header, and I live basically at sea level:

Main jet..............#170
Needle................OCEMR
Needle clip...........5th position from top
Float level...........9mm
Slow air screw........1.0 turns out
Main fuel jet.........#200
Pilot jet.............#48
Idle mixture screw....2.5 turns out

It might be a tad lean on the main, I am going to try a #172 main.

  • atreiou

Posted January 15, 2004 - 10:39 AM

#3

wow... :)
thanks very much... I will try with this parametres

  • atreiou

Posted January 15, 2004 - 11:12 AM

#4

sorry I can't find the "main fuel jet" in the exploded wiew :).. can you help me another time ? :D

Posted Image

Posted Image

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  • michaeln

Posted January 15, 2004 - 12:34 PM

#5

Oops! Main Air Jet, not Main Fuel Jet. Sorry about that.

Also, that diagram is for the FCR downdraft. Mine is a sidedraft, as shown at:

http://www.sudco.com...de_diagram.html

  • atreiou

Posted January 16, 2004 - 12:29 AM

#6

you are right...
this is the correct carb.. like the mine
this "main air jet" tou are talking about, what item number have ?
because on my FCR I don't find this nozzle.. :)
If you intend the item n°26, I can tell to you that on the mine nothing are writed on it :D
Posted Image

  • michaeln

Posted January 16, 2004 - 07:49 AM

#7

No, it's number 103 in the diagram I referenced on Sudco's site. It's inside the intake side of the carb, you have to take the intake bell (held on by two black allen screws) to get at it.

  • atreiou

Posted January 16, 2004 - 08:16 AM

#8

ok, this evening i'll check it
thanks another time.





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