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Thread: Need help! 250r rebuild questions.

  1. #1
    kimmer250r's Avatar
    kimmer250r is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    Need help! 250r rebuild questions.

    Ok guys, need some motor heads help. Gettin' ready to rebuild the R's motor and can't decide how I want to build it. A guy at the local shop told me to use a 87-89 crank and rod with a 86 piston and a spacer plate to get more mid-range and top-end. I started to order the stuff to do it, but have seen a couple of people that said it will be slower. Should I go for this combo or stick to a stock or overbore application. Any help would be appreciated!
    THERE FROM THE START-HASPIN VET 2002-2003-2004-2005-2006-2007-(missed 08-dang babies)-2009-2010-2011-2012-2013 AND ALL THE REST!

    1985 Big Red
    198? Kawasaki KLT 250
    19?? ATC70
    "Secret Project" Tiny Titan
    2010 Polaris Crew

  2. #2
    G-MAN-1 is offline Just Too Addicted Arm chair racerJust too addicted
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    Maybe Be Help Full

    i would have to say that if it runs fine leave it alone. but if it needs rebuilding. then go with new piston and rings,circlips.wrist pin and bearing. and i always go with the WISECO PRO LITE. they are the best. maybe some new reeds. and if u have to do the crank always go stock with that.........

  3. #3
    Join Date
    May 2002
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    Southeastern Wisconsin
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    I'm with G-Man but to answer your question I like the 86 set up the best. Stick with the next size bore with the Pro lite. Also 2-strokes love compression just have the head done for a little more, nothing crazy and get some porting done. I'll be a night and day difference with a good pipe and jetting.
    '02 Honda 416ex - A seasoned blend of 11 herbs and spices
    '04 Honda Recon - The yard machine and snow plow
    '88 Honda CR250R - Another chapter in my torrid all terrain affair

  4. #4
    Join Date
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    no need to stroke it...i spanked a few stroker motors, at the local drags with my 86 it was .100 over with a milled and decked head..reeds and a fmf

  5. #5
    Join Date
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    Location
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    Freakfixs know what I'm talking about. This will do a lot more than that crank swap.
    '02 Honda 416ex - A seasoned blend of 11 herbs and spices
    '04 Honda Recon - The yard machine and snow plow
    '88 Honda CR250R - Another chapter in my torrid all terrain affair

  6. #6
    Join Date
    Sep 2002
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    938

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    Kimmer the 86 is considered the more powerfull motor stick with it

  7. #7
    Guest

    86

    Is there any difference between the '85 and the '86 motors?

  8. #8
    kimmer250r's Avatar
    kimmer250r is offline At The Back Of The Pack Arm chair racerAt the back of the pack
    Join Date
    Mar 2002
    Location
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    new idea

    Well, I thought it over and I think I might do the LRD 300 sleeve kit. Looks like a sweet kit, but it says it uses a 87-89 cylinder. I'm going to call them and ask if I can use a 86 cylinder, if not I'll sell mine on ebay and buy a 87-89 cylinder. As for the crank, I'll just put new bearings in and a new rod on. Thanks for the info guys!
    THERE FROM THE START-HASPIN VET 2002-2003-2004-2005-2006-2007-(missed 08-dang babies)-2009-2010-2011-2012-2013 AND ALL THE REST!

    1985 Big Red
    198? Kawasaki KLT 250
    19?? ATC70
    "Secret Project" Tiny Titan
    2010 Polaris Crew

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