carby help

4 replies to this topic
  • BrettJ

Posted June 03, 2005 - 04:00 PM


hey guys I have some questions
first here is my details
Altitude 20M ASL
Temp round 30°C
Needle clip on 3rd pos, 175 main
Bike: 01 XR650R with side panel cut and staintune exhaust

Ok I pulled apart my carby because the last time I went riding there seemed to be a bit of hesitation if I snapped on the throttle from low revs to full. I thought I might rejet to fix this problem. Everything is fine but when I took the main jet out the was another jet underneath it (needle jet holder?) and I took that out to. The problem is the needle jet holder under the main sits on a brass washer and I accidently moved it can someone please tell me what the standard amount of turns out the washer should be. Also when I read about the needle clip position are people talking about it from the top? What needle clip and main would you recommend for my setup?

  • frankstr

Posted June 03, 2005 - 05:55 PM


The reason for the hesitation when you snap the throttle is due to the lack of a accelerator pump squirting gas... :)
Get a Edelbrock carb and that will take care of your hesitation.. :)
Sounds like that peein keihin is jetted about right though....... :D

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  • BrettJ

Posted June 03, 2005 - 08:16 PM


I want a Edelbrock but am a student with no money :). I have just re jetted needle position 2nd from top and 182 main. Mid seems to have more power but i think the hesitation is still there :) The thing i'm not sure on is needle position

  • BrettJ

Posted June 04, 2005 - 03:26 AM


I think I have the best jetting possible for my setup, 175 main needle clip 4th from top. I don't think I can get an better throttle response unless I get a pumper carb which I can't afford

  • RJC

Posted June 04, 2005 - 08:27 AM


I agree with BrettJ. Same setup on my bike. I didn't want to by the Edlebrock either. I just want to have fun riding the bike. And it will do more than I can ask from it setup the way it is. So, I'm having fun, learning alot, BRP is happy now and I've got money in my pocket for that Baja Adventure. :)

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