Question about Yamaha YZ 250 F Motorcycles

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Are 2002,03 ,04,05,06, yz250f crankcases interchangable with a 2007 yz 250f engine. If not are any? Thanks

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  • maecw May 31, 2010

    im still confused?

  • maecw Jun 01, 2010

    The Question was. Are crankcases interchangable. The rotation angle of the engine is changed by altering the frame engine mount positions in 2007 YZ250F on the FRAME and not the location of the mounting holes on the crankcase covers itself. So if the crankcase has not been changed externally ARE 04,05,06,07 interchangable? Thank You.

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I couldn't find anything saying yes or no, but by the looks of this, it has changed. I'll let you figure it out. Hope it helps.

CHANGES FOR 2007

  • Carburetion, ignition and other modifications provide more top-end performance and over-rev ability.
  • The engine mounting angle has been changed; rotating the cylinder head rearward changes the balance of the machine for compactness and sharp handling. Smaller engine mounting bolts and other things reduce weight by 2.5 pounds.
  • Steering head moved 3mm back to make the bike super nimble for turning into tight corners and for carving tight lines.
  • Replaced the upper cast triple clamp with a light and strong forging, slightly reducing steering head rigidity. Bike uses lighter outer fork tubes, lighter wheel rims and light wave-type brake rotors to assist in super-accurate, super-responsive steering. A new front axle bracket saves weight.
  • A lighter front brake caliper and master cylinder with smaller pistons saves weight; a new front brake lever gives excellent feel. The result is outstanding braking power and less unsprung front-end weight.Are 2002,03 ,04,05,06, yz250f crankcases - 25fbar1.jpg
  • Increased the length of the rear shock by 1.5mm to place more focus on the front end to sharpen handling. Replaced steel damping adjusters with aluminum ones to remove more weight from the four-way adjustable, titanium sprung rear suspension unit. Adopted YZ250-style rear linkage to save weight and increases strength.
  • Other mass-centralization measures include a lighter rear axle and adjusters. More than 50 fasteners throughout the bike have been replaced with lighter ones.
  • New exhaust pipe works with engine changes to boost top-end response while adhering to more quiet 2007 AMA noise regulations.
  • This year’s ProTaper aluminum handlebar bend raises the grips a bit for an expanded cockpit feel. Forged bar clamps reduce weight for superior handling.
http://www.motorsports-network.com/YAMAHA/YZ07/yz07.htm#YZ250F

Posted on May 31, 2010

  • Ned  White
    Ned White Jun 01, 2010

    Me to, The one way you can find out is to call the dealer or go there and get the part number for the crankcase from the 07, then check the 05/ 06,, number and see if it is the same, or just ask the dealer or one of the mechanics there. From the looks of the fact that they tilted the engine back and made smaller mounting bolts, tells me something has changed. What happened? Did you crash your bike and break the case? Or just got a deal on a 07 engine? Hope this helps.

  • Ned  White
    Ned White Jun 01, 2010

    I did some more digging, you right about the angle change, just moved the frame, I thought they moved the holes, anyway, these guys say it is the same including the starter except for minor adj? Whatever they are. Check it out.

    http://boardreader.com/thread/YZ_250F_En...


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