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Thread: what has to be done to fit a 400ex motor in a 300ex

  1. 10-25-2005, 09:43 AM #1
    MX wannabe
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    what has to be done to fit a 400ex motor in a 300ex

    i want to put a 400 ex motor in my 300ex i but i heard that i would have to cut the frame and i dont really want to do that. i know that i will need a longer swingarm for the power to not flip me over all the time... thanks
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  2. 10-26-2005, 02:52 PM #2
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    bwamos
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    350x conversion will be much easier. Do some engine work with the extra cash and you'll be of to the races.
    Brandon -O||||O-
    1998 Honda TRX300EX (330)
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  3. 10-27-2005, 08:41 AM #3
    MX wannabe
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    what do you mean 350x conversion??? do you just mean do the mods to my motor to boost it to a 350?? like cam, piston, valves, exhaust, and bore or do you mean another motor?
    thanks
    gettin a 250r gonna be great compared to my 300ex ooooooooo ya baby
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  4. 10-27-2005, 09:41 AM #4
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    400exrider707
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    Originally posted by MX wannabe
    what do you mean 350x conversion??? do you just mean do the mods to my motor to boost it to a 350?? like cam, piston, valves, exhaust, and bore or do you mean another motor?
    thanks
    He means swap in the motor from an ATC 350x. Much easier and a million people have already done it. You could pick a 350x engine up cheaper than a 400ex one as well.
    M-Dub

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  5. 10-27-2005, 10:33 AM #5
    MX wannabe
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    ok thanks a lot guys
    gettin a 250r gonna be great compared to my 300ex ooooooooo ya baby
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  6. 10-27-2005, 11:14 AM #6
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    wilkin250r
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    There is a company called Powroll that actually sells a conversion kit. A few spacers, a little grinding on the motor, NO FRAME MODIFICATIONS, and a custom exhaust, and you're on your way.
    Duncan Racing 340PV, +2 A-arms, +4 LSR axle, and a host of other goodies.
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  7. 10-27-2005, 11:22 AM #7
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    400exrider707
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    Originally posted by wilkin250r
    There is a company called Powroll that actually sells a conversion kit. A few spacers, a little grinding on the motor, NO FRAME MODIFICATIONS, and a custom exhaust, and you're on your way.
    is that for the 350x motor or the 400ex motor?
    M-Dub

    Quadless as of now
    05 KLX110 - some stuff
    01 ZR600 - bone stock
    1992 LT80 - pitquad I guess?

    So far the people that have SCREWED me on here:
    powerband
    and yamablaster24 more yamablaster24


    Remember every time you run wheel spacers or flipped rims... god kills a kitten

    "The best you have ridden is the best you know" Paul Thede- RaceTech

    Ignorance is NOT bliss -- it's embarrassing and counter-productive

    Experience is a tough teacher she gives the test first the lesson afterwards


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  8. 10-27-2005, 01:55 PM #8
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    ZeroLogic
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    350x
    Bikeless.
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  9. 10-27-2005, 02:22 PM #9
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    ltl666devil
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    its very easy to do. heres what it looks like in a 250x.(the same as a 300ex)
    Attached Images Attached Images
    88 trx250r full arens frame Duncan motor and lsr everything

    07 yfz 480 worked sold
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  10. 10-27-2005, 02:27 PM #10
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    wilkin250r
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    Probably in the next few weeks, I'm going to be selling a 350X motor for anybody interested in doing this conversion.

    I'm only looking to sell it to somebody knowledgable, however, because I'm not exactly sure what shape the internals are in.
    Duncan Racing 340PV, +2 A-arms, +4 LSR axle, and a host of other goodies.
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