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Thread: 250R crapping out on topend

  1. 06-30-2005, 06:34 AM #1
    Fox250R's Avatar
    Fox250R
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    250R crapping out on topend

    installed my 38 stryker and a rad valve a few days ago with a 182 main..it was spuddering at the topend so i dropped to a 178 and its still crapping out..Whats going on do i need to drop another size? Low and mid is AMAZING....Should i put my stock 34 back in?? lol
    1986 ATC 250R
    Ported w/ Cool head
    LED pipe and silencer.
    Vforce3
    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
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  2. 06-30-2005, 07:22 AM #2
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    TrikerR
    TrikerR is offline Formerly hond_atc Arm chair racerJust too addicted
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    may just be the needle setting...try adjusting that.
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  3. 06-30-2005, 10:15 AM #3
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    wanta86r
    wanta86r is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    topend misfiring would be a rich main jet. I am running the same setup on my R. You basically have to keep dropping main jet sizes until it revs out clean. Do plug chops to be sure.
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  4. 06-30-2005, 11:12 AM #4
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    I'm running a 175 main with a similar setup.
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  5. 06-30-2005, 01:08 PM #5
    88 Turbo Coupe
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    Swap the rad valve out
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    DO NOT send any thing to whats his face (dirt-face/crasher) here on the board. What a scum bag. He screwed (stole) money from me and screwed me on my ME360 and Hondaline 300R engine rebuilds.
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  6. 06-30-2005, 01:15 PM #6
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    What does the spark plug show?
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  7. 06-30-2005, 01:31 PM #7
    Fox250R's Avatar
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    Quote Originally Posted by 88 Turbo Coupe
    Swap the rad valve out
    Are you crazy? you know how much of a pain the butt that was installing those dam things? lol
    1986 ATC 250R
    Ported w/ Cool head
    LED pipe and silencer.
    Vforce3
    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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  8. 06-30-2005, 01:32 PM #8
    Fox250R's Avatar
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    Quote Originally Posted by jenndnn3
    What does the spark plug show?
    Dark dark brown
    1986 ATC 250R
    Ported w/ Cool head
    LED pipe and silencer.
    Vforce3
    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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  9. 06-30-2005, 03:15 PM #9
    AZ250R's Avatar
    AZ250R
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    You never tried that old round 38mm Kuni did ya... I was hoping you would so that when you upgraded to the stryker you could tell me the diff!?!?! Oh well, seems you gots some tune'n to do now.


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  10. 06-30-2005, 04:38 PM #10
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    I Agree with 88 Turbo .... Low-End Set Up ....Been There Done That ...
    You Could Keep Jetting it till it's right but..... still slow .. Let Me Guess .... ?
    You Have A FMF Pipe ? :-)
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  11. 06-30-2005, 05:31 PM #11
    Fox250R's Avatar
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    PT highrev/fatboy
    1986 ATC 250R
    Ported w/ Cool head
    LED pipe and silencer.
    Vforce3
    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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  12. 06-30-2005, 05:34 PM #12
    Fox250R's Avatar
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    Quote Originally Posted by AZ250R
    You never tried that old round 38mm Kuni did ya... I was hoping you would so that when you upgraded to the stryker you could tell me the diff!?!?! Oh well, seems you gots some tune'n to do now.
    Actually i was going to but i heard from many people thats its a real pain to tune....Then i found this A/s so i never used the kuni..Still have it tho
    1986 ATC 250R
    Ported w/ Cool head
    LED pipe and silencer.
    Vforce3
    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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  13. 06-30-2005, 06:05 PM #13
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    Fox250R
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    How many turns should my air screw be turned? could that be the problem?
    1986 ATC 250R
    Ported w/ Cool head
    LED pipe and silencer.
    Vforce3
    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

    Reply With Quote Reply With Quote
  14. 06-30-2005, 06:38 PM #14
    1984kxtTECATE
    1984kxtTECATE is offline Got The Holeshot Arm chair racerJust too addicted
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    Throw it down to a 172 main and see if there is a difference. What oil ratio are you at? Also a 38mm carb will give you top end along with the paul turner pipe, do you have any port work what so ever, or any other types of motor mods that you have left out you could have 2 performance parts that arnt working good together. Last but not least are you running the correct spark plug for it, I know I fouled a plug one time and had to put a colder plug in it and it totally crapped out for my top-end, or you may want to try several different plugs and see if you cant get better results. Just a few things to consider......
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  15. 06-30-2005, 06:42 PM #15
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    3leggeddog
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    your air screw will have nothing to do with top end.your rich on the main drop to a 170-172.if your gonna jet go atleast 1 size at a time.thats two jets lower,would equal i size,the others are half sizes.it's breaking up at full throttle right?
    Full Walsh CRF 450 hybrid 250r
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