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Thread: Toying with Idea of CR500 swap

  1. #1
    Join Date
    Oct 2002
    Location
    Snohomish, Wa
    --
    1,028

    Toying with Idea of CR500 swap

    I am toying with the idea of a cr500 swap into my 85 250r eventually. Besides the kickstarter snaffu what else needs to be modded to fit this motor? I know new motor mounts. Any frame mods? Also any ways to strengthen the R frame? I know a couple of guys that have busted there frames either on the backbones or the part in front of the motor. I have a pretty modded 250r as it is (310cc, msd, 41mm carb) But thinking of building this bike for just racing.

    Any info would be great
    Thanks
    Tyler
    85 ATC 250r -Under Construction
    86 TRX250r
    05 KFX400
    02 400EX

  2. #2
    Tbcoplin is offline At The Back Of The Pack Arm chair racerFirst time rider
    Join Date
    Oct 2009
    Location
    Hammond, la
    --
    157
    Weld some 3/16" plate steel on the bottom to tie the tubular frame together. This will prevent it from cracking. Beefs it up. The skid plate covers it up very nicely.
    84 Big Red- User
    85 250SX- clean
    85 200X- mint- < 10 hrs on it
    85 350X- Mint- <40 hours on it
    86 350X- mint- <40 hours on it
    2-85 tri-z's- Both frame off restorations
    84 250R- Mint- <15 hours on it
    86 250R- Super clean- < 30 hours on it
    86 500R- Sick fast!!!
    86 Tecate 3- Frame off restoration- Mint
    86 Big Red- Mint- <30 hours on it

  3. #3
    Join Date
    Jul 2006
    Location
    United States
    --
    7,765
    Have billy Modd your frame for the 5hundy, look at my sig build and peep it.

  4. #4
    Join Date
    Feb 2005
    Location
    Orchard Colorado
    --
    659
    Billy's frame mods, The only way I'd go!!!!!!!!!!!!!

    As soon as I can chase down an '86 frame, thats what I'm planning on.
    '85 Cagiva 200
    '86 Cagiva 500
    '82 ATC 480R
    '83 ATC 250R DG
    '83 Nicholson 185s
    Owned 5 Franks, sold 4, have one left.

  5. #5
    Join Date
    Feb 2009
    Location
    Rome,NY
    --
    1,046
    leave your 250 and get another frame for the 500r racer if you have the space and funds?
    Last edited by KILLER; 54 Minutes Ago at 06:17 PM. Reason: beer

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