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  1. #1

    Default how do you tell a bad reed valve?

    hi, have a 02 yz250, weekend rider... new top end etc.
    lately noticed the bike bogs a bit at full throttle, higher gears, just does not seem to get on the pipe like it used to....

    could reed valves be going bad? how can i tell, w/o opening it up, symptom wise?


    what brand should i get? vForce3 ?

    jim R
    jjrho@adelphia.net

  2. #2

    Default

    i had a similar problem once
    check the crank seals when those leak it will act like that

  3. #3

    Default crank seal

    ok...uh, would it leak or is this where you spray carb cleaner with engine running and see if the rpm changes?


    jim R

  4. #4
    Join Date
    Oct 2004
    Location
    New England
    Posts
    3,494

    Default

    Kind of hard to check crank seals with any spray as the stator is in the way. A leakdown test will confirm bad seals. The easiest way to check bad reeds is to pull the carb and intake and take a look. Several things can cause similar symptoms, the only way of knowing is to check each one.

    The first thing to consider is a basic clean and tune-up. Definately check your air filter.
    2002 Banshee Ported cylinders, ported reed cages w/Boyeson dual-stage reeds, Wiseco stock bore, Flotek .035 milled head, K&N intake adaptor and filter, Trinity pipes (for now anyway), +3+1 arms, Fox TRX450R front shocks Badass without the big bill

    1987/90 LT500 Ported cylinder, ported reedcage w/Boyeson dual stage reeds, Wiseco 530 bore, Trinity pipe with custom fabbed silencer, Custom fabbed 144 front hubs and 115 rears with Motorsport Alloys Tork wheels, Sidewinder chain and sprockets, other stuff It's a Zilla, 'Nuff said

  5. #5
    Join Date
    Oct 2004
    Location
    New England
    Posts
    3,494

    Default

    And yeah, V3 is about the best thing going right now.
    2002 Banshee Ported cylinders, ported reed cages w/Boyeson dual-stage reeds, Wiseco stock bore, Flotek .035 milled head, K&N intake adaptor and filter, Trinity pipes (for now anyway), +3+1 arms, Fox TRX450R front shocks Badass without the big bill

    1987/90 LT500 Ported cylinder, ported reedcage w/Boyeson dual stage reeds, Wiseco 530 bore, Trinity pipe with custom fabbed silencer, Custom fabbed 144 front hubs and 115 rears with Motorsport Alloys Tork wheels, Sidewinder chain and sprockets, other stuff It's a Zilla, 'Nuff said

  6. #6
    Join Date
    Feb 2005
    Location
    kansas
    Posts
    290

    Default

    when my vf2 went south it wouldnt idle very well and it would vary up and down a lot and wouldnt pull itself very well.