cam/valve train removal on ex 250 ninja

Discussion in 'Motorbike Technical Discussion' started by dogalone, Apr 29, 2004.

  1. dogalone

    dogalone Guest

    no manual here;
    any trick/procedure for easier removal of head on 250 ninja;
    have not previously dealt with automatic cam tensioner, so am guessing it
    has to be removed first...

    dogalone, Apr 29, 2004
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  2. dogalone

    Bill Smith Guest

    If you're puzzled about how to get something this basic apart, you
    need a manual. You'll especially need it if you intend to put it
    together again. One thing I've learned in my 30 odd years, amateur and
    professional, at working on bikes is; if available, get the manual.

    Bill Smith
    Bill Smith, Apr 29, 2004
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  3. dogalone

    dogalone Guest

    some very good points here (cam caps being engine specifc, take adjuster off
    first, establish some kind of marking for aligning cams on re-assembly, and;
    get a manual);

    the original post was directed towards someone with a manual who would
    happen to have the specs, and the where-with-all to advise someone without

    am guessing the torque values on the cam caps to be in the 10# range; now if
    i can just get away with using the old head gasket...

    dogalone, Apr 29, 2004
  4. dogalone

    Mark Olson Guest

    I happen to have the manual and the supplement for this bike. I wouldn't
    mind looking up a particular torque value or something along those lines.
    What I won't do is handhold someone through the entire process, because
    it would be time consuming to type it out, and you won't be getting all
    the applicable procedures, which are scattered throughout the manual
    sections and also in the supplement for the later model variants.

    You *need* to buy the manuals before taking the cylinder head off, trust
    me. This is by far the best advice you are going to get. Going at this
    sort of work without a manual is idiocy.

    I bought the manuals from, they are pretty good
    on price:

    Part Number: 99924-1066-01
    Description: Service Manual EX250E
    Price: $28.82

    Part Number: 99924-1109-60
    Description: Service Manual Supplement EX250
    Price: $19.46
    Mark Olson, Apr 29, 2004
  5. dogalone

    sammmm Guest

    buy the manual, or steal it.
    there's nothing tricky about the job but screw it up and you'll wish you had
    bought the manual.
    the 250 ninja is a sweet little bike. i enjoyed mine.
    my ninjas came in baskets. worked out well.
    good luck, sammm
    sammmm, May 1, 2004
  6. dogalone

    dogalone Guest

    yeah; well to get the head into the shop (my first ninja 250 has me thousand
    out of pocket only to find that it is on the verge of sucking the #1
    intake), i'm hoping the online parts diagram will be enough (for example,
    wouldn't want to make the mistake of not taking the complete tensioner off
    as an assemby)
    dogalone, May 1, 2004
  7. dogalone

    dogalone Guest

    well had little trouble using common mechanical practice on the tear down;
    now need the expected torque values and sequence for putting the cams & head
    back on.
    dogalone, May 9, 2004
  8. dogalone

    dogalone Guest

    okay, well went with about 25 #'s on head torque, cold; couldn't make
    heads/tails out of how in the world you would torque it warm (i see now
    somewhere between 1.2 to 2 kg m); and am still guessing as to the cam caps.

    found a pretty cool site ( ) , but have never seen
    cams settings based on other than marks or pointing directly each other
    dogalone, May 9, 2004
  9. dogalone

    sammmm Guest

    try not to mix up the bolts. some are different lengths. the basket cases i
    restored had stripped threads from the
    good luck, samm
    sammmm, May 10, 2004
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