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Thread: 250x problems

  1. #1
    Join Date
    Aug 2006
    Location
    mass.
    Posts
    578

    250x problems

    my 250x has no top end at all, im going to be rebuilding the topend soon, do you guys thing it could be the cam or something with the valves?
    White 06 YFZ Full HMF

    2000 Yamaha Blaster
    LRD, UNI, Carbon tech, RAZR, DG, Durablue, twin row carrier,30mm oko, reed spacer, injecter block off....

    Stock 1987 250x

  2. #2
    Join Date
    Aug 2006
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    mass.
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    any one? it's allmost like its hitting the rev limiter at like 1/2 trottle.
    White 06 YFZ Full HMF

    2000 Yamaha Blaster
    LRD, UNI, Carbon tech, RAZR, DG, Durablue, twin row carrier,30mm oko, reed spacer, injecter block off....

    Stock 1987 250x

  3. #3
    Join Date
    Oct 2002
    Location
    worst town I've ever lived in... Spencer,OH
    Posts
    4,186
    Could be a valve/cam problem. Also timing chain and tensioner. You may even want to make sure your main jet didn't work loose and fall into the carb bowl.
    I am now quadless...

  4. #4
    Join Date
    Feb 2005
    Location
    ohio
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    2,333
    I wouldnt doubt that your cam lobes could be badly worn to where theres not much lift and your rocker arms are worn badly as well,if they are too far gone it wont let the motor rev out.
    426ex,lt250r banshee and kfx700 v force,yz250 mx bike

  5. #5
    Join Date
    Aug 2006
    Location
    mass.
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    578
    ok, ill check these things out.
    White 06 YFZ Full HMF

    2000 Yamaha Blaster
    LRD, UNI, Carbon tech, RAZR, DG, Durablue, twin row carrier,30mm oko, reed spacer, injecter block off....

    Stock 1987 250x

  6. #6
    Join Date
    Sep 2006
    Location
    Argyle NY
    Posts
    888
    Adjust your valves to .004 while your at it, for more compression.
    MY TOYS
    406X Honda
    Powroll stroker w/ Vesrah shorty rod
    ProFab big bore
    White Brothers cam
    ported & polished head w/ +1 intake
    Kibble White HD springs
    38mm Keihin-choke removed
    full DG RCM exhaust- want X-6
    DID silent HD cam chain
    K&N filter-No lid
    02 Raptor-
    High comp 720 kit
    Web cam 461/496
    K&N filter
    Supertrapp exhaust
    lowered 1.5"
    92 250X-12:1 WIESCO .020/No-Toil filter
    03 CBR954 - full 2brothers exhaust
    95 Kawasaki Ninja ZX6 streetfighter
    93 Honda XR80R
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  7. #7
    Join Date
    Feb 2005
    Location
    ohio
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    or increased rocker arm wear
    426ex,lt250r banshee and kfx700 v force,yz250 mx bike

  8. #8
    Join Date
    Sep 2006
    Location
    Argyle NY
    Posts
    888
    That's okay. Those Honda valves will wear a lot faster than the cam and rockers.
    MY TOYS
    406X Honda
    Powroll stroker w/ Vesrah shorty rod
    ProFab big bore
    White Brothers cam
    ported & polished head w/ +1 intake
    Kibble White HD springs
    38mm Keihin-choke removed
    full DG RCM exhaust- want X-6
    DID silent HD cam chain
    K&N filter-No lid
    02 Raptor-
    High comp 720 kit
    Web cam 461/496
    K&N filter
    Supertrapp exhaust
    lowered 1.5"
    92 250X-12:1 WIESCO .020/No-Toil filter
    03 CBR954 - full 2brothers exhaust
    95 Kawasaki Ninja ZX6 streetfighter
    93 Honda XR80R
    83 Z50R -K&N filter
    98 Arctic Cat Cougar 550 liquid
    86 Ski-Doo Citation

  9. #9
    Join Date
    Dec 2006
    Location
    Spencer, Ma
    Posts
    8
    my 250x is doing the same took my top end off and my rocker arms n cam were prettyy cooked now in the process of changing them and i neeed help on getting the cam off so if u change your cam let me kno how it goes

  10. #10
    Join Date
    Sep 2006
    Location
    Argyle NY
    Posts
    888
    Just unbolt the cam gear and the cam will come out.

    As far as the rockers you will need to cut notches in the dowel pins, heat the head cover, then pry the pins out (using a screwdriver or cutting pliers on the notches) so that you may take the rocker shafts out. After that the rockers will pretty much fall out for you.
    MY TOYS
    406X Honda
    Powroll stroker w/ Vesrah shorty rod
    ProFab big bore
    White Brothers cam
    ported & polished head w/ +1 intake
    Kibble White HD springs
    38mm Keihin-choke removed
    full DG RCM exhaust- want X-6
    DID silent HD cam chain
    K&N filter-No lid
    02 Raptor-
    High comp 720 kit
    Web cam 461/496
    K&N filter
    Supertrapp exhaust
    lowered 1.5"
    92 250X-12:1 WIESCO .020/No-Toil filter
    03 CBR954 - full 2brothers exhaust
    95 Kawasaki Ninja ZX6 streetfighter
    93 Honda XR80R
    83 Z50R -K&N filter
    98 Arctic Cat Cougar 550 liquid
    86 Ski-Doo Citation

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