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Thread: 250r low end bog (vid)

  1. #1
    Join Date
    Jun 2004
    Location
    Oregon
    --
    1,768

    250r low end bog (vid)

    https://youtu.be/9vIYCuuMyDw

    Hi everyone!
    So long story short I just rebuilt my R top end bottom end more aggressive port cool head replaced my 38 a/s with a 38pwk 180m 55 pilot klotz @ 50/1 190 psi. it runs ok but I’m getting this low end hesitation when I stab the throttle.

    Any ideas what it might be? Thanks all…
    1986 ATC 250R
    Ported w/ Cool head
    LED pipe and silencer.
    Boyesen Rad Valve
    Keihin PWK 38mm
    Works Ultra Cross Shock
    LSR +2 Axle
    American Star Racing +4 Swinger
    LED Intake
    Hi-Flite desert seat
    OEM clutch 89 upgrade
    2021 YFZ450Rse Rossier R5 Titanium Header AIS Delete FCI Vortex ECU


  2. #2
    Join Date
    Jan 2009
    Location
    ohio
    --
    1,750
    You play with you needle at all? Or try a different plug I’ve had bad new plugs that caused running issues.
    If its on the internet its got to be true they can't put any lie's on the internet

  3. #3
    Join Date
    Jun 2004
    Location
    Oregon
    --
    1,768
    Checking that today actually. I hope it’s just the plug! Thank you
    1986 ATC 250R
    Ported w/ Cool head
    LED pipe and silencer.
    Boyesen Rad Valve
    Keihin PWK 38mm
    Works Ultra Cross Shock
    LSR +2 Axle
    American Star Racing +4 Swinger
    LED Intake
    Hi-Flite desert seat
    OEM clutch 89 upgrade
    2021 YFZ450Rse Rossier R5 Titanium Header AIS Delete FCI Vortex ECU


  4. #4
    Join Date
    Mar 2010
    Location
    Slidell, LA
    --
    4,737
    Quote Originally Posted by Fox250R View Post
    https://youtu.be/9vIYCuuMyDw

    Hi everyone!
    So long story short I just rebuilt my R top end bottom end more aggressive port cool head replaced my 38 a/s with a 38pwk 180m 55 pilot klotz @ 50/1 190 psi. it runs ok but I’m getting this low end hesitation when I stab the throttle.

    Any ideas what it might be? Thanks all…
    Wher is your needle? Sounds like an off idle bog. I would raise the need up a clip.
    Feedback for yaegerb: Click Here

    Need something blasted or polished or both? Send me a PM

  5. #5
    Join Date
    Jun 2004
    Location
    Oregon
    --
    1,768
    Quote Originally Posted by yaegerb View Post
    Wher is your needle? Sounds like an off idle bog. I would raise the need up a clip.
    Never even looked tbh. Just ordered the PWK from Duncan. only thing I did was change the main from a 185 to a 180. I’ll take a look!
    Thank you
    1986 ATC 250R
    Ported w/ Cool head
    LED pipe and silencer.
    Boyesen Rad Valve
    Keihin PWK 38mm
    Works Ultra Cross Shock
    LSR +2 Axle
    American Star Racing +4 Swinger
    LED Intake
    Hi-Flite desert seat
    OEM clutch 89 upgrade
    2021 YFZ450Rse Rossier R5 Titanium Header AIS Delete FCI Vortex ECU


  6. #6
    Join Date
    Jul 2009
    Location
    South Florida
    --
    6,722
    Agreed . A hesitation off idle I usually lower the clip which raises the needle , if it’s just slight go one notch , if it’s bad then go extreme and put the clip all the way down .
    Also sometimes closing the spark plug gap to about 14 thousands helps with higher compression two stroke motors , I also try different spark plugs . Instead of the typical br8es try a NGK br9eg
    78 atc 90/180cc Dickson Full Suspension
    76 ATC90/180cc Nicholson
    77 atc 90 Dickson Full Suspension
    84 KLT 110/123cc Powroll Racer from 80s
    87 atc 125m stock
    84 atc 200x Curtis Sparks
    84 atc 200x Powroll My race bike from 80's
    83 atc70/108cc Powroll blue Xmas Special
    81 atc185s HP-ATC full suspension

    Performance Shop is Open PM me for Service

    My Feedback http://www.3wheelerworld.com/showthr...ck+shortline10

  7. #7
    Join Date
    Jan 2009
    Location
    ohio
    --
    1,750
    Let us know what worked for you . It looks like we were all in agreement needle and/or plug
    If its on the internet its got to be true they can't put any lie's on the internet

  8. #8
    Join Date
    Jun 2004
    Location
    Oregon
    --
    1,768
    I will thank you. I’ll take it out this week and see what happens!
    Thanks again
    1986 ATC 250R
    Ported w/ Cool head
    LED pipe and silencer.
    Boyesen Rad Valve
    Keihin PWK 38mm
    Works Ultra Cross Shock
    LSR +2 Axle
    American Star Racing +4 Swinger
    LED Intake
    Hi-Flite desert seat
    OEM clutch 89 upgrade
    2021 YFZ450Rse Rossier R5 Titanium Header AIS Delete FCI Vortex ECU


  9. #9
    Join Date
    Jun 2004
    Location
    Oregon
    --
    1,768
    Hi all! So I dropped the main to 175 did a plug chop looks pretty good (light choc brown) Took it to the lake, still has a low end hesitation. Closed the gap on the plug just a bit to see if that might help (nope) played with my air screw 1 turn 1 1/2 and 2 turns also 2 1/2 (same) Air filter is clean. Same thing it was doing before when I stab the throttle it sputters for 1 second or so then it wakes up. Basically low end sucks atm. Going to check my cdi and then start with my needle and pilot. Other than that not sure what it Could be at this point. Fun times!


    https://hosting.photobucket.com/imag...=278&crop=fill

    https://hosting.photobucket.com/imag...=278&crop=fill
    Last edited by Fox250R; 08-19-2021 at 10:09 AM.
    1986 ATC 250R
    Ported w/ Cool head
    LED pipe and silencer.
    Boyesen Rad Valve
    Keihin PWK 38mm
    Works Ultra Cross Shock
    LSR +2 Axle
    American Star Racing +4 Swinger
    LED Intake
    Hi-Flite desert seat
    OEM clutch 89 upgrade
    2021 YFZ450Rse Rossier R5 Titanium Header AIS Delete FCI Vortex ECU


  10. #10
    Join Date
    Jul 2009
    Location
    South Florida
    --
    6,722
    Raise your needle by lowering the clip , that’s the adjustment for just off idle to about half throttle after that your on the main jet .
    78 atc 90/180cc Dickson Full Suspension
    76 ATC90/180cc Nicholson
    77 atc 90 Dickson Full Suspension
    84 KLT 110/123cc Powroll Racer from 80s
    87 atc 125m stock
    84 atc 200x Curtis Sparks
    84 atc 200x Powroll My race bike from 80's
    83 atc70/108cc Powroll blue Xmas Special
    81 atc185s HP-ATC full suspension

    Performance Shop is Open PM me for Service

    My Feedback http://www.3wheelerworld.com/showthr...ck+shortline10

  11. #11
    Join Date
    Jan 2015
    Location
    MB, Canada
    --
    64
    Before you start digging into your ignition, you might want to try putting the airbox back in and/or try a smaller carb. I know that's not what you want to hear. You've gone up 6mm in carb size and put on a VERY unrestrictive air intake system. Your intake velocity has been drastically decreased. Porting and a pipe help with flow, but it may not be enough. Too large of carbs are notoriously difficult to jet. You definitely need a richer low speed circuit. Slide, needle and needle jet? Possibly the pilot as well.
    Just food for thought before you spend money on ignition.

  12. #12
    Join Date
    Jun 2004
    Location
    Oregon
    --
    1,768
    Thank you Going to try the carb first.
    1986 ATC 250R
    Ported w/ Cool head
    LED pipe and silencer.
    Boyesen Rad Valve
    Keihin PWK 38mm
    Works Ultra Cross Shock
    LSR +2 Axle
    American Star Racing +4 Swinger
    LED Intake
    Hi-Flite desert seat
    OEM clutch 89 upgrade
    2021 YFZ450Rse Rossier R5 Titanium Header AIS Delete FCI Vortex ECU


  13. #13
    Join Date
    Jun 2004
    Location
    Oregon
    --
    1,768
    Quote Originally Posted by shortline10 View Post
    Raise your needle by lowering the clip , that’s the adjustment for just off idle to about half throttle after that your on the main jet .
    I will try that thank you!
    1986 ATC 250R
    Ported w/ Cool head
    LED pipe and silencer.
    Boyesen Rad Valve
    Keihin PWK 38mm
    Works Ultra Cross Shock
    LSR +2 Axle
    American Star Racing +4 Swinger
    LED Intake
    Hi-Flite desert seat
    OEM clutch 89 upgrade
    2021 YFZ450Rse Rossier R5 Titanium Header AIS Delete FCI Vortex ECU


  14. #14
    Join Date
    Jun 2004
    Location
    Oregon
    --
    1,768
    So after looking at my plug again it seems a bit rich on the top end. So went to a 170 main and pilot from 55 to a 50. Rode it around a bit and seems very snappy but won’t really know until I get to back down to the beach. We will see!
    1986 ATC 250R
    Ported w/ Cool head
    LED pipe and silencer.
    Boyesen Rad Valve
    Keihin PWK 38mm
    Works Ultra Cross Shock
    LSR +2 Axle
    American Star Racing +4 Swinger
    LED Intake
    Hi-Flite desert seat
    OEM clutch 89 upgrade
    2021 YFZ450Rse Rossier R5 Titanium Header AIS Delete FCI Vortex ECU


  15. #15
    Join Date
    Jun 2004
    Location
    Oregon
    --
    1,768
    Had a Chance to ride it after the carb changes and basically mid and top is explosive but the low end still has a hesitation or something going on. Going to try a dgh needle and see if that changes anything.
    1986 ATC 250R
    Ported w/ Cool head
    LED pipe and silencer.
    Boyesen Rad Valve
    Keihin PWK 38mm
    Works Ultra Cross Shock
    LSR +2 Axle
    American Star Racing +4 Swinger
    LED Intake
    Hi-Flite desert seat
    OEM clutch 89 upgrade
    2021 YFZ450Rse Rossier R5 Titanium Header AIS Delete FCI Vortex ECU


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