XR650L + Keihin FCR 41mm pumper: tuning advice sought for 3000'


12 replies to this topic
  • machman

Posted October 01, 2007 - 09:43 AM

#1

I just won an FCR on ebay last night. I wonder if any of you have tuned this carb on this bike at this elevation. I'm just looking for a baseline so I know where to start when I get it. It came from a well tuned LC4 at 600' so I'm guessing I'll need to make some adjustments.

Mods I'll have are as follows:
-White Bros Header
-Supertrapp muffler with 18 discs
-10.5:1 +1mm piston
-Hot Cams Stage 1 cam
-K&N pod filter

Any advice would be greatly appreciated. I've done some searching and just thought it'd be easier to ask the question directly. I know there's a lot of knowledge here.:confused:

  • martinfan30

Posted October 01, 2007 - 09:47 AM

#2

I just won an FCR on ebay last night. I wonder if any of you have tuned this carb on this bike at this elevation. I'm just looking for a baseline so I know where to start when I get it. It came from a well tuned LC4 at 600' so I'm guessing I'll need to make some adjustments.

Mods I'll have are as follows:
-White Bros Header
-Supertrapp muffler with 18 discs
-10.5:1 +1mm piston
-Hot Cams Stage 1 cam
-K&N pod filter

Any advice would be greatly appreciated. I've done some searching and just thought it'd be easier to ask the question directly. I know there's a lot of knowledge here.:confused:



i have the same setup minus cam/piston. i am at 4300 ft. and jetted my slant fcr 160/55 at first and ran great. now i'm at 158/52 but i think i'm a little lean down low. i'll prob. go back to 55/158. get an after market fuel screw too. without it you cant adjust the fuel screw without yanking carb/rotating it. which fcr did you get?

  • Denn10

Posted October 01, 2007 - 10:26 AM

#3

THAT carb SUCKS for an L at your elevation you CANT tune it for shit so SELL it to me cuz im at 3300 and it will work MUCH BETTERER for me!!!! Dont listen to MARTIN hes a CLOWN LOVER!!!

  • martinfan30

Posted October 01, 2007 - 11:05 AM

#4

THAT carb SUCKS for an L at your elevation you CANT tune it for shit so SELL it to me cuz im at 3300 and it will work MUCH BETTERER for me!!!! Dont listen to MARTIN hes a CLOWN LOVER!!!


HAHAHA!:confused:

  • machman

Posted October 01, 2007 - 11:26 AM

#5

THAT carb SUCKS for an L at your elevation you CANT tune it for shit so SELL it to me cuz im at 3300 and it will work MUCH BETTERER for me!!!! Dont listen to MARTIN hes a CLOWN LOVER!!!


SOLD ! ! ! I'll take $25:thumbsup: :confused: :confused: :confused: :confused:


There's great deals on these things. I paid $250 for mine. It's the slant body.

  • machman

Posted October 01, 2007 - 11:27 AM

#6

get an after market fuel screw too. without it you cant adjust the fuel screw without yanking carb/rotating it. which fcr did you get?


Any suggestions on who makes these for the FCR slant body?

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  • martinfan30

Posted October 01, 2007 - 12:30 PM

#7

Any suggestions on who makes these for the FCR slant body?


mine was made by research / design i think.

http://www.koubalink.../fuelscrew.html

they have one too.

  • machman

Posted October 01, 2007 - 02:22 PM

#8

Thanks man, just ordered one.:confused: :confused:

  • martinfan30

Posted October 01, 2007 - 02:24 PM

#9

makes adjusting the pilot circuit a snap!

  • machman

Posted October 01, 2007 - 07:01 PM

#10

Also noticed XRs Only has one with a long handle on it.

  • machman

Posted October 18, 2007 - 02:03 PM

#11

Got one locally for the same money.

Anyone have other impressions/confirmation of the right jetting for this carb at this elevation?

  • exaresix

Posted October 18, 2007 - 06:45 PM

#12

I'm going to order an extension...I've had bad luck with the replacement screws.

  • martinfan30

Posted October 19, 2007 - 11:31 AM

#13

I'm going to order an extension...I've had bad luck with the replacement screws.


hows the mx version working out for you?





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