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Thread: 99 yzf125 2stroke

  1. #1
    Join Date
    Dec 2004
    Location
    Duluth MN
    --
    803

    99 yzf125 2stroke

    no matter what gear you are in, with it not running, We can push it around like its in nutral. it feels like there is no compression, good spark, and fresh gas. We can hear the motor turning over, and the carb was just cleaned. The main problem, it will not start. Its been sitting for 3 years. (the rider had a tree fall ON him, in the middle of a ride)
    Confused As A Hungry Baby In A Topless Bar!!!

    '04 Honda CRF250R
    '82 Honda 200 4'sale soon
    '90 and '91 Arctic Cat Prowler 440
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  2. #2
    Join Date
    Apr 2003
    Location
    Spanaway, WA
    --
    1,244
    Tried a new plug? Sounds like you have some clutch issues as well. Does it only feel like there's no compression when you push or when you kick it as well?Just a BTW, it's just YZ, not YZF.
    Hoarder of the finest junk

    '82 YT175
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    Lots of vintage and not so vintage two wheeled stuff.

  3. #3
    Join Date
    Dec 2004
    Location
    Duluth MN
    --
    803
    Its not my bike, the manual said yzf, thanks for the correction. There is almost no compression, but the plug gets great spark. And he tried starting fluid ( I know, bad idea) but it did not even fire on that. Another guy pulled the plug and found no oil in the tranny, I know on my Honda, it would affect the clutch, but im not going to find out how.
    Confused As A Hungry Baby In A Topless Bar!!!

    '04 Honda CRF250R
    '82 Honda 200 4'sale soon
    '90 and '91 Arctic Cat Prowler 440
    '81 Kawasaki LTD 440 Belt Drive!!
    '92 Yamaha Warrior 350
    '05 DS 90

    Helmet save'd my friend's life, and mine, wear one!!!
    Trying is the first step to failure
    3ww Needs an iPhone app

  4. #4
    Join Date
    Mar 2003
    Location
    Barnesville,Ohio
    --
    2,298
    2 stokes eat top ends. have you check the rings and cylinder?
    1985 Honda 350X - a lot of performance stuff, everything but a cam, hope to get one soon
    1984 Honda 200ES
    198? Yamaha YT60 Tri-Zinger
    TrikeFest '04 & '07 Survivor

  5. #5
    Join Date
    Nov 2004
    Location
    Mass.
    --
    90
    Sounds like the rings are stuck or gummed up on the piston. Try and put a few drops of oil in the cylinder to see if that will raise the compression any. A little BP blaster in the cylinder might free them up.
    Dave
    Parts for sale
    85 KX250 Roller with engine
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  6. #6
    Join Date
    Sep 2006
    Location
    Northwest Indiana
    --
    1,893
    Seems you have no compression. It will never run if it doesnt have any. Remove top end and be prepaired to send cylinder off to get re-plated. Those are nicasil. New piston, rings, pin bearing and pin. Then it will run. Probably just worn out. Not a big deal. High strung 125's need strict maintenance to perform. And even then a fresh top end at least once a year depending on hours used.

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