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Thread: help on 300ex

  1. #1
    Join Date
    Jun 2005
    Location
    Marion, Ohio
    --
    50

    help on 300ex

    i wanted to know what thing i could do to my 300ex to make it ...ALOT faster or if a 350x motor or perferably a 250r motor will bolt into it?

    or what is the best big bore for the 300ex's thanks

  2. #2
    Join Date
    May 2002
    Location
    Southeastern Wisconsin
    --
    3,658
    Best big bore is a 330, best bore and stroke is a 352. I've built a couple 250x/300ex motors and you're way better off selling and buying a 400 or a 450. The 350x motor does fit with ease but you're still no better off then just buying a 400ex. If you did the 350x swap you'd need a custom exhaust.
    '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

  3. #3
    Join Date
    Jun 2005
    Location
    Marion, Ohio
    --
    50
    yea i dont have the money to get a new quad , so i was looking for the cheapest mods

  4. #4
    Join Date
    Jun 2005
    Location
    Marion, Ohio
    --
    50
    also what do you think the cost of those things would be?

  5. #5
    Join Date
    May 2002
    Location
    Southeastern Wisconsin
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    3,658
    You're looking at about $1200-1300 for a good 352cc motor and that's if you can do the wrench time. That's why you're better off selling and buying a 400.
    '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
    Jun 2005
    Location
    Marion, Ohio
    --
    50
    well thanks for the help but that seems a bit much

  7. #7
    Lots_Of_Nothing's Avatar
    Lots_Of_Nothing is offline So bombed at TF I needed both hands to hold my beer Teaching quads a lesson
    Join Date
    Oct 2002
    Location
    Upstate NY
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    2,665
    Quote Originally Posted by PsychoX
    well thanks for the help but that seems a bit much
    Well, Lets look at your other choices..

    350x motor.. A good running motor goes for around $500-$800, Then you must buy the complete wiring harness, kicker, shifter, carb, all that fun stuff. Then you must buy a custom exhaust (a few companys offer the exhaust kit for a couple hundred). So at the end of that, your looking at $1200++

    250R motor? Well, a good running R motor goes for around $450-$700 (stock motors). Then again, you must buy all the wiring, kicker, shifter carb, etc. and then somehow cram a pipe for it in there. Of course you would then have to deal withmounting it, and the radiators, etc. I'd say with that your again, looking at $1200+++

    The same goes for a big bore, really pricey, and it takes away alot of the reliability.

    As Oldschoolin allready said. You are better off buying a 400 or something different.

    Sell your 300, save up some cash for a bit. then buy yourself a decent machine that suits your needs.
    Give me no lip and I tell you no lie.

    -TF 05' , And cant wait till 06!


  8. #8
    Join Date
    Aug 2005
    Location
    HI
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    1,575
    sell the 300ex and but a ATC250R!
    Rest in peace Rex Carlson

  9. #9
    okieRrider's Avatar
    okieRrider is offline At The Back Of The Pack Arm chair racerAt the back of the pack
    Join Date
    Apr 2003
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    344
    Then part out the atc 250r and buy a nice quad.........Chris

  10. #10
    Join Date
    May 2005
    Location
    Southern NH
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    1,489
    ^^^ WTF?????????????? Are you on CRACK!!!!!

    keep the 250r, you will scream by 400ex's all day long...
    "I have but one lamp by which my feet are guided, and that is the lamp of experience." -Patrick Henry

    NEW ENGLAND ATC owners please join!:http://www.3wheelerworld.com/group.php?groupid=27

  11. #11
    Join Date
    Feb 2004
    Location
    CUYAHOGA FALLS, OHIO
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    1,242

    My Ol 300ex

    I Put A Lrd Full Exhaust/jet Kit/k&n On My 02 And It Made A Very Substantial Difference. 500 Buck For Everything. If Your Budget Is Tight And Your Planning On Keeping The Bike These Are The Easiest And Cheapest Mods.
    3-85 ATC 70
    86 ATC 250R
    86 WETBIKE
    01 KX250
    2011 KAW SXR800- 35YR EDITION
    05 HERITAGE/SPRINGER/SOFTTAIL

  12. #12
    Join Date
    Mar 2005
    Location
    overton, PA
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    5,257
    Sell It To Me And I Can Try And Find You A 400 Or Somethign Along Those Lines If Thats What You Want?

  13. #13
    okieRrider's Avatar
    okieRrider is offline At The Back Of The Pack Arm chair racerAt the back of the pack
    Join Date
    Apr 2003
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    344
    Mines already gone to the four corners

  14. #14
    Join Date
    Jun 2005
    Location
    Marion, Ohio
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    50
    well thanks for all the help everyone

  15. #15
    Join Date
    Jul 2005
    Location
    Lenox TWP MICHIGAN
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    79
    I have a a 300ex with the folowing mods that made it quite quick. Fmf full exhaust, k&n, jet kit, High comp piston, rev box and cam. They all made it almost faster then a stock 400ex. They all cost me around 600 bucks but i put them all in. When i race my buds 400 it kind of close. if we race around the back field then its close and relatively even but in a drag he only beats me by about 3 bike lengths.

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