Page 1 of 5 1 2 3 ... LastLast
Results 1 to 15 of 75

Thread: new engine seized, what went wrong (pics included)

  1. 10-13-2008, 12:59 AM #1
    sbjones73's Avatar
    sbjones73
    sbjones73 is offline At The Back Of The Pack Arm chair racerAt the back of the pack
    Join Date
    Jun 2008
    Location
    wisconsin
    --
    414

    new engine seized, what went wrong (pics included)

    ok people. i am just pissed to the extreme right now. a little history here.

    84 250r engine has been totally gone through about 10 hours ago (riding hours) took it out today for just a little fun and do another plug chop. got her into 4th gear about 3/4 throttle and the whole things just locks up on me. took it out of gear and brought back home. just for giggles i tried to kickit over again and the thing started, i shut it down immediatly (ifigured damamge was already done). removed the plug. looks a little darker than card board, a little lighter than the rust colored car primer. took the head off and saw scoring in the cylinder. removed the cylinder and this is what i found.

    as you can tell the plug color is good in my opinion. fins for the cylinder and the head have been plasted clean and been painted with ceramic pj1 paint. stock exhaust. 20:1 for mixture with 92 gas and belray oils through out the entire engine (including 2 stroke oil) engine is bored 70mm over stock, no porting or anything else done to it.

    as stated above. i have ran this thing several hours prior to this happening. it has been up in the throttle a couple of times in the lower gears (3/4 throttle, but only wide open 1 time for plug chop, which was good just the like the picture)

    i would like to know what in the heck you guys think caused this. i am baffled , and i don't want this to happen again when i redo it. please let me know. pics are below.
    Attached Thumbnails Attached Thumbnails PICT0001.JPG   PICT0002.JPG   PICT0003.JPG   PICT0004.JPG   PICT0005.JPG   PICT0011.JPG  

    84 250r gone,
    87 suzuki lt250r trail machine, gone to fund ice racer,
    85 250r ice racing project started !!!!!!
    Reply With Quote Reply With Quote
  2. 10-13-2008, 01:06 AM #2
    Autophysn's Avatar
    Autophysn
    Autophysn is offline Just Too Addicted Arm chair racerJust too addicted
    Join Date
    Feb 2008
    Location
    Orange County California
    --
    726
    Wow, that sucks! I am very interested in what the guys have to say!
    1986 ATC250r
    1984 ATC70


    Reply With Quote Reply With Quote
  3. 10-13-2008, 01:07 AM #3
    Erics350x's Avatar
    Erics350x
    Erics350x is offline Power User Got the holeshot
    Join Date
    Apr 2006
    Location
    Crestview, Florida
    --
    2,429
    lean...............
    That plug looks like you had a head gasket leaking water in.
    The person who says it cannot be done should not interrupt the person who is doing it.


    Rides
    85 ATC350X
    85 ATC200X


    My Feedback http://http://www.3wheelerworld.com/...-for-Erics350x
    Reply With Quote Reply With Quote
  4. 10-13-2008, 01:08 AM #4
    mdunn
    mdunn is offline First Time Rider Arm chair racerNew to the board
    Join Date
    Feb 2004
    --
    126
    What piston to bore clearance were you running with what type of piston?
    Reply With Quote Reply With Quote
  5. 10-13-2008, 01:18 AM #5
    jlharrison3's Avatar
    jlharrison3
    jlharrison3 is offline New to the board Arm chair racerNew to the board
    Join Date
    Jul 2008
    Location
    alabama
    --
    11
    Lean! Not enough clearance
    could also cause this problem.
    Mic the piston and the cylinder .
    A wiseco piston requires more
    clearance than a cheap cast
    piston. That thing got hot! Pretty
    sure it didnt have enough fuel.
    Reply With Quote Reply With Quote
  6. 10-13-2008, 01:22 AM #6
    KASEY's Avatar
    KASEY
    KASEY is offline weee weeee weeeeeeeeeee ! ! ! The day begins with 3WW
    Join Date
    Jan 2003
    Location
    ARIZONAS BIGGEST TROUBLEMAKER
    --
    4,239
    LOOKS LIKE A COLD SIEZE was it warmed up ????? oh by the way eric... its an 84 so i highly doubt it is leaking WATER... when you seize a piston on the intake side it usually indicates cold seize... also i don't think thats the right plug either,,,,,, threads look to short
    Reply With Quote Reply With Quote
  7. 10-13-2008, 01:25 AM #7
    sbjones73's Avatar
    sbjones73
    sbjones73 is offline At The Back Of The Pack Arm chair racerAt the back of the pack
    Join Date
    Jun 2008
    Location
    wisconsin
    --
    414
    ok i will go and mic up the piston and the cylinder real fast here. i am running a wiseco. this is an air cooled engine. no water in the engine at all.

    i will be right back with the measurements.
    84 250r gone,
    87 suzuki lt250r trail machine, gone to fund ice racer,
    85 250r ice racing project started !!!!!!
    Reply With Quote Reply With Quote
  8. 10-13-2008, 01:26 AM #8
    sbjones73's Avatar
    sbjones73
    sbjones73 is offline At The Back Of The Pack Arm chair racerAt the back of the pack
    Join Date
    Jun 2008
    Location
    wisconsin
    --
    414
    kasey what is a cold sieze?
    84 250r gone,
    87 suzuki lt250r trail machine, gone to fund ice racer,
    85 250r ice racing project started !!!!!!
    Reply With Quote Reply With Quote
  9. 10-13-2008, 01:29 AM #9
    KASEY's Avatar
    KASEY
    KASEY is offline weee weeee weeeeeeeeeee ! ! ! The day begins with 3WW
    Join Date
    Jan 2003
    Location
    ARIZONAS BIGGEST TROUBLEMAKER
    --
    4,239
    an aluminum piston expands at twice the rate of a steel cylinder,, if you don't warm it up with a new motor you can in some cases sieze a piston when its cold,,, like what just happened to you,,,,,,
    Reply With Quote Reply With Quote
  10. 10-13-2008, 01:30 AM #10
    jlharrison3's Avatar
    jlharrison3
    jlharrison3 is offline New to the board Arm chair racerNew to the board
    Join Date
    Jul 2008
    Location
    alabama
    --
    11
    What is your main jet size? Did u
    take your new piston to the
    machine shop so they could bore
    your cylinder to that piston?
    Reply With Quote Reply With Quote
  11. 10-13-2008, 01:37 AM #11
    sbjones73's Avatar
    sbjones73
    sbjones73 is offline At The Back Of The Pack Arm chair racerAt the back of the pack
    Join Date
    Jun 2008
    Location
    wisconsin
    --
    414
    ok i did my measurements as good as a i could with a dial gauge. bore and clearance are right on as far as the box for the piston says.

    yes i took the piston with the cylinder to the machine shop and the box.

    my main jet is 130.
    84 250r gone,
    87 suzuki lt250r trail machine, gone to fund ice racer,
    85 250r ice racing project started !!!!!!
    Reply With Quote Reply With Quote
  12. 10-13-2008, 01:46 AM #12
    sbjones73's Avatar
    sbjones73
    sbjones73 is offline At The Back Of The Pack Arm chair racerAt the back of the pack
    Join Date
    Jun 2008
    Location
    wisconsin
    --
    414
    so you think i cold siezed it. man, i still am about to puke. i ran it for about 20 minutes or so before i got on the throttle like that. !@#$%%^^&**()(*&^%$#@! this gets me so mad!!!!! but it sounds like i did it to myself.

    other than letting the engine warm up, how do you prevent this? and also, after the engine has been thuroughly broke in, will this continue to be something i need to watch out for. meaning get her warm then ride it hard after warmed up?
    84 250r gone,
    87 suzuki lt250r trail machine, gone to fund ice racer,
    85 250r ice racing project started !!!!!!
    Reply With Quote Reply With Quote
  13. 10-13-2008, 01:46 AM #13
    jlharrison3's Avatar
    jlharrison3
    jlharrison3 is offline New to the board Arm chair racerNew to the board
    Join Date
    Jul 2008
    Location
    alabama
    --
    11
    Im running a 300 big bore now
    on my 84 but, when it was a
    250 i ran a 140 main jet. Your
    plug isnt dark enough for my
    liking. Im leaning towards the
    fuel being the problem. . A
    clearance issue would have
    shown up before now if u have
    ten hous on it . Jmo
    Reply With Quote Reply With Quote
  14. 10-13-2008, 01:50 AM #14
    jlharrison3's Avatar
    jlharrison3
    jlharrison3 is offline New to the board Arm chair racerNew to the board
    Join Date
    Jul 2008
    Location
    alabama
    --
    11
    If that trike was running 10
    minutes *Edited**Edited* u nailed it . . It was
    warm enough .
    Reply With Quote Reply With Quote
  15. 10-13-2008, 01:54 AM #15
    sbjones73's Avatar
    sbjones73
    sbjones73 is offline At The Back Of The Pack Arm chair racerAt the back of the pack
    Join Date
    Jun 2008
    Location
    wisconsin
    --
    414
    i changed my mainjet from a 140 to a 130 becuase i fouled out 2 plugs before this. my last plug chop looked very similar to this one.
    84 250r gone,
    87 suzuki lt250r trail machine, gone to fund ice racer,
    85 250r ice racing project started !!!!!!
    Reply With Quote Reply With Quote
//ArrowChat Integreation Code //