41FCR on XRL no work

10 replies to this topic
  • Rover31

Posted February 18, 2004 - 03:00 PM


okay so today I put on my super-go-fast carb. Everything goes great except the throttle does not snap back (no return). Soooo I thought well maybe a little vacume (I know it doesn't work that way) would help.
But then it won't even fireup. It's got gas in the carb but thump!
Any clues?

  • Dutch

Posted February 18, 2004 - 04:36 PM


Wow - I'd like to help you Travis but you got me confused.
Where did this carb come from? Is it set up for the "L"?
What did you mean by
"maybe a little vacume"? Did you mean vacuum?

  • Rover31

Posted February 18, 2004 - 05:55 PM


Yes this carb is L ready, it's from Sudco says right on the box XR650L. Gas is in the bowl but no thumb.
More importantly The throttle is not snapping back. I took it back apart cleaned and lubed everything. The carb closes on its own (no cables attached. I am sure it is something small that I am overlooking, that's why the experts here (thats you reading this)at TT will give me wisdom.... Right?

Sorry yes I meant vacuum, the wife is not here to help with my horrid spalleng.

  • irondude

Posted February 18, 2004 - 06:07 PM


are the cables reversed?

  • Rover31

Posted February 18, 2004 - 08:06 PM


No good ques. though. the carb does open fully and closes but with the manual twist/OH CRAP back version not the safe snap back version

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  • Dutch

Posted February 19, 2004 - 03:29 AM


As far as the carb not snapping shut - my bet is the routing of your cables.
It is amazing what a small change in cable position will make.
As far as the bike not starting, that carb has
an accelerator pump. If you took the carb off the bike and squirted raw fuel
into the intake tract it would bark.
The point is if the bike won't bark you have to look at the spark
or timing or whatever because something should be happening.

  • Rover31

Posted February 19, 2004 - 07:52 AM


Yeah I think you are probably right Dutch. I will be looking at that tomorrow.
I will keep you guys posted.


  • michaeln

Posted February 19, 2004 - 03:34 PM


I have an FCR41 on my L and it runs great, and the throttle does snap right back. I found I couldn't use the cables in the Sudco kit though, I used the stock Honda cables.

The setup on my carb was pretty far off from where it is now, and I had trouble starting it with Sudco's setup. Since I have tweaked it, it starts even cold without giving it any throttle at all.

Here's the way it's set up now (I am at sea level)

Main jet..............#172
Needle clip...........5th position from top
Float level...........9mm
Slow air screw........1.0 turns out
Main air jet.........#200
Pilot jet.............#48
Idle mixture screw....2 turns out

  • Rover31

Posted February 19, 2004 - 04:50 PM


Hey that's awesome info Thanks :)
I hope tomorrow to maybe swap back to the honda cables (pain) and give it a shot.
Does the bike start well when cold at say, 40 degreesF?


  • michaeln

Posted February 19, 2004 - 04:54 PM


Hey that's awesome info Thanks :)
I hope tomorrow to maybe swap back to the honda cables (pain) and give it a shot.
Does the bike start well when cold at say, 40 degreesF?


I'm in San Francisco. We don't do 40F very often. But yes, it starts easily, I might have to start it a couple times before it will idle though on cold mornings.

  • Rover31

Posted February 21, 2004 - 05:25 PM


A little prewarming of the engine/garage and she fired up. Big thump and a few backfires and I was smiling, now to just get the throttle to shut properly.
Thanks for all the advise guys :D :)


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