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Thread: ATC 250RF project under way...Still at it!!!

  1. #16
    Join Date
    Feb 2006
    Location
    Texas
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    738
    The pics everybody was waiting for: THE ENGINES. Side by side. (Sorry for the before pics, had to change image host???)



    AND THE MOST IMPORTANT...

    This engine had no stator or flywheel, that adds at least 2-3 more pounds!!!



    This engine is complete!!!



    And don't even get me started on the exhaust!!!

    Did you guys knew this???

    TORKER.
    Last edited by torker; 02-07-2010 at 09:01 PM.
    THOSE WHO SAY IT CANNOT BE DONE, SHOULD NOT GET IN THE WAY OF THOSE BUSY DOING IT...

  2. #17
    Join Date
    Feb 2006
    Location
    Texas
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    738
    Test fitting the engine...



    I must have taken the engine in and out about 500 time already. Good thing is really light!!!

    TORKER...
    THOSE WHO SAY IT CANNOT BE DONE, SHOULD NOT GET IN THE WAY OF THOSE BUSY DOING IT...

  3. #18
    Join Date
    Sep 2009
    Location
    North East Michigan
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    31
    Quote Originally Posted by torker View Post
    I must have taken the engine in and out about 500 time already.
    I hear that! About the fourth time you take it out a day it starts getting old.
    NEMPD.... soon

    85 ATC250R 40whp
    81 ATC450R Elsinore Hillshooter
    K0 US90


    If cleanliness is next to godliness and brake parts cleaner cleans EVERYTHING, is brake parts cleaner a gift from god?? Think about it.

  4. #19
    Join Date
    Oct 2004
    Location
    Maryland
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    3,077
    I'm curious to see if that tank with clear, the rocker box on that bad boy is pretty stout. Looks awesome!
    And that's the rest of the story. ~ Paul Harvey

    "Yes its broken, but does that really surprise you?."
    "What happened? What does it look like happened?!?!"

  5. #20
    Join Date
    Feb 2006
    Location
    Texas
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    738
    Tank will need cutting and welding. Maybe repositioning of the petcock assy'. But I need to finish welding and fabricating the aluminum engine mounts first.

    TORKER.
    THOSE WHO SAY IT CANNOT BE DONE, SHOULD NOT GET IN THE WAY OF THOSE BUSY DOING IT...

  6. #21
    Join Date
    Oct 2004
    Location
    Maryland
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    3,077
    Not to rain on your parade, but I would look into the tank very carefully before you finalize your frame.

    250Rfan cut and plastic welded a plastic tank for his 450r build, I might be out of place saying this but I'm pretty sure I read some where that it did not hold and he ended up having a metal one custom made. I doubt it was cheap.
    And that's the rest of the story. ~ Paul Harvey

    "Yes its broken, but does that really surprise you?."
    "What happened? What does it look like happened?!?!"

  7. #22
    Join Date
    Feb 2006
    Location
    Texas
    --
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    Yeah, I read that. I'll ask Jason, but I doubt very much that is a viable alternative for me, it will all depend on the price.
    Since it's very minor what needs to be cut out of the tank (I have 1 cut already) compared to what needs to be cut for the 450R, maybe I'll try heating it. We'll see what happens.
    But I'm sure I'll be able to do it, no problem

    TORKER.
    THOSE WHO SAY IT CANNOT BE DONE, SHOULD NOT GET IN THE WAY OF THOSE BUSY DOING IT...

  8. #23
    Join Date
    Oct 2004
    Location
    Maryland
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    3,077
    Sweet git R done!
    And that's the rest of the story. ~ Paul Harvey

    "Yes its broken, but does that really surprise you?."
    "What happened? What does it look like happened?!?!"

  9. #24
    3leggeddog's Avatar
    3leggeddog is offline The sun shines on a dogs ass every now and then Got the holeshot
    Join Date
    Nov 2004
    Location
    ohio
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    2,534
    hmm,so all this talk about how much lighter the 250r engine is is crap....very interesting.

    this is gonna be a sweet build to watch,good luck to you!
    Full Walsh CRF 450 hybrid 250r

  10. #25
    Billy Golightly's Avatar
    Billy Golightly is offline Always finding new and exciting ways to not give a hoot in hell Catch me if you can
    Join Date
    Sep 2002
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    Live Oak, FL
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    The engine weight is very interesting, for sure! I never would have imaged that the 5 stroke was that much lighter weight, wow.


    Although, the CR500 motor is about 7lbs lighter than the 250Rs (Counterbalancer, forward kick start gears, etc) but a 4 stroke, just never would have thought it!

  11. #26
    Join Date
    Feb 2006
    Location
    Texas
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    Yes, I was very surprised. I had to put them on the scale a few times just make sure.
    THOSE WHO SAY IT CANNOT BE DONE, SHOULD NOT GET IN THE WAY OF THOSE BUSY DOING IT...

  12. #27
    Join Date
    Feb 2006
    Location
    Texas
    --
    738
    FCR carbs are huge when compared to their 2 stroke counterparts. This is just 37mm



    But it clears just fine. YFZ 450R throttle cable installed, works great. 1/4 inch needs to be cut out of where it threads in the throttle housing, otherwiese it will be too tight and the carb might even be opened.

    The carb lines up perfect with the airbox boot, this is an easy fix!!!



    You can see here everything clears just fine.


    TORKER.
    Last edited by torker; 02-08-2010 at 01:59 PM.
    THOSE WHO SAY IT CANNOT BE DONE, SHOULD NOT GET IN THE WAY OF THOSE BUSY DOING IT...

  13. #28
    Join Date
    Feb 2006
    Location
    Texas
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    The exhaust: Titanium -vs- steel



    More weight savings...The difference is amazing.

    TORKER.
    THOSE WHO SAY IT CANNOT BE DONE, SHOULD NOT GET IN THE WAY OF THOSE BUSY DOING IT...

  14. #29
    Join Date
    Nov 2009
    Location
    San Francisco, California
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    67
    Very cool build you have going on here!!!

  15. #30
    audioworks04's Avatar
    audioworks04 is offline At The Back Of The Pack Arm chair racerAt the back of the pack
    Join Date
    Oct 2008
    Location
    Kansas City, KS
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    332
    Awsome progress so far. Looks like that yamaha fits really nice in that honda frame. Keep us updated and good luck on the rest of the build.

    2005 CRF450R Alum Frame build done, switching to inverts.
    86 trx250r fmf fatty fmf q k&n v force reeds gold valve rear shock with eibach spring.
    86 atc250r stock sand only
    88 NX250 mint rainy day
    85 kawi js550 stand up basicly stock
    87 kawi js550 scary fast for a stand up

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