2004 WR250F questions

Discussion in 'Thumpers' started by leonphelps, Nov 26, 2007.

  1. leonphelps

    leonphelps TAT/Prudhoe Bay

    Joined:
    Oct 19, 2006
    Oddometer:
    1,045
    Location:
    Waterford CT
    Yea, I was sitting in the driveway, I let it idle for about 5 minutes to get it warmed up. Then tried bliping it, and it would stall out. I could open it slowley and it would be ok. Before I cleaned the carb and took it apart completely, it would stall or bog on the trail when I wacked it full open. The bike would pop start itself while rooling stall and just stop.

    But hey I have electric start!!:clap

    The other thing I want to do is trim the throttle stop from 20mm to 18.3. I dont think I can get the .3 but say in the general area. When I was reading the Dynojet web site on the stage 2 kit thats what they were doing. I read some other posts over at thumpertalk about doing it also.
    #21
  2. leonphelps

    leonphelps TAT/Prudhoe Bay

    Joined:
    Oct 19, 2006
    Oddometer:
    1,045
    Location:
    Waterford CT
    Ok, now I am getting pissy.....

    Put the #40 leak jet it, works good, no more bog. But.....now I cant get it to idle. It will only idle with the choke pulled out. I've been chasing the settings around, with regards to air/fuel mixture knob. So what I think I am going to do now is remove the carb AGAIN and move the needle clip to the #3 position.

    Here's what i have for the settings:

    175 Main jet
    40 Leak jet
    Needle is at #4 clip
    Pilot #42
    #22
  3. Rusty Rocket

    Rusty Rocket Life behind "Bars"

    Joined:
    Dec 22, 2005
    Oddometer:
    11,046
    Location:
    Trying to leave CT
    Idle mixture is controlled by the pilot jet and the pilot air screw. Moving the needle isn't the answer. Play with the adjustable air screw. Start at 1.5 turns out from full closed. you may have to get a new pilot jet. It is pretty cold here in CT now and things tend to run a bit leaner when it's cold.
    #23
  4. leonphelps

    leonphelps TAT/Prudhoe Bay

    Joined:
    Oct 19, 2006
    Oddometer:
    1,045
    Location:
    Waterford CT
    I remember when I first took the carb out it was at 3 1/2 turns out. I was trying the settings at 1 turn to 2 1/2 area. But 3 1/2 seems alot. Other people here on AFF suggested 1.5 to 1.75 turns out.

    I think I'll try 3 1/2 tomorrow and see how that does before I remove the carb AGAIN and move the clip.
    #24
  5. spidennis

    spidennis SandStorm Adventures

    Joined:
    Nov 24, 2006
    Oddometer:
    1,276
    Location:
    South Padre Island, Texas .... far from anything
    You have the "bog"! and as recommended in a earlier post, head over to ThumperTalk and do a search. There are several ways, and add ons to cure the dreaded "bog". You'd think that the factory would do something about this huh? Anyway the tt guys can help!
    #25
  6. leonphelps

    leonphelps TAT/Prudhoe Bay

    Joined:
    Oct 19, 2006
    Oddometer:
    1,045
    Location:
    Waterford CT
    Yea i just posted over there, after i did a search to see what everyone is doing with their bikes....
    #26
  7. chevaliernoir

    chevaliernoir Le Chevalier Noir

    Joined:
    Oct 29, 2007
    Oddometer:
    103
    Location:
    Toulouse (France)
    I had exacly the same, even the 3 1/2 turn to be OK.
    Finally, just disconnecting the TPS sensor made the bike very very smooth, and I came back to less than 2 turns to have a perfect behaviour.
    I'm like this now.
    The bike is from 2003, but with same wonderfull carb, and awfull TPS sensor
    #27