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Thread: 400ex engine into a 350x frame

  1. 02-23-2008, 02:20 AM #1
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    400ex engine into a 350x frame

    i've posted already in trikesylvania i have an extra 400ex sitting in my shop doing nothing ...i want a 350x .. i can't find a 350x close enough to be able to buy.. so i thought about putting a 400ex engine into a 350x frame.. looks like the jug and head are higher on the 40o but otherwise the engines are very similar. has anyone ever attempted this..what do you guys think. did i mention i have an abundance of aftermarket parts also for a 400ex. so this would work out pretty good if the engine would fit ..and then theres the oil tank...just thinking out loud

    give me a little input..

    thanks
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  2. 02-25-2008, 11:45 PM #2
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    hondahaulic
    hondahaulic is offline Just Too Addicted Arm chair racerJust too addicted
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    I really think this would be a great trike setup. Electric start, a little more stock power, parts availability, aftermarket support (440x?? ), and if you could get ahold of a 2005+ engine, youv'e got reverse. For the oil tank, you could modify the backbone of the frame or the front downtube to hold the oil. That is, if you can't find a simple spot somewhere in the frame to just mount a tank.
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  3. 02-29-2008, 12:47 AM #3
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    i'm seriously pondering this project!!!!
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  4. 02-29-2008, 02:32 AM #4
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    so you have a 350x roller layin around?

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  5. 02-29-2008, 02:47 AM #5
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    Quote Originally Posted by hondahaulic View Post
    I really think this would be a great trike setup. Electric start, a little more stock power, parts availability, aftermarket support (440x?? ), and if you could get ahold of a 2005+ engine, youv'e got reverse. For the oil tank, you could modify the backbone of the frame or the front downtube to hold the oil. That is, if you can't find a simple spot somewhere in the frame to just mount a tank.
    what is the stock hp of a 400ex?

    440cc is small to what a 350x can be made into.....e start and the oil tank is just dead weight IMO
    80s......185 atc, Yamaha tri-moto 200, 85 200x with tons of work
    90s......89 Suzuki quad racer 250 (raced 250 A class for 6 years, late 90s.. custom framed 250x with long travel shocks and a built 350x motor.... built Honda 110
    00s...... chomeoly framed 350 RX with all the goodies (thanks to my bro)
    2012.....Replaced the 350x motor for a 444cc YZ426
    WWW.HREATV.COM
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  6. 02-29-2008, 07:33 PM #6
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    Dirtcrasher is offline Power User Catch me if you can
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    Got that right.....

    The 350X motor itself is heavy enough as is! and has tons of potential.
    All our government does is distract us while they steal from us, misspend our tax $ and ruin our country
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  7. 03-01-2008, 05:28 PM #7
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    OldSchoolin86
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    The 400ex engine is too big to do without frame mods and you need to deal with the oil tank. Mounting is all different too. If you want e-start and reverse in a 350x the 300ex engine with an fst 390 kit is the smarter choice. Even a built 330 would run with most 350x's.
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  8. 03-01-2008, 05:36 PM #8
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    i just thought of something.........remeber the old 6 speed 250x motors TC used to build, well they were 350x trannys in the 250x cases.

    now why couldnt you use the 250x tranny in some 350x cases?

    6th is just replaced with reverse but i think it would be easyer to swap the whole tranny....or at least have them on hand


    edit... on second thought this might be harder then it seems
    80s......185 atc, Yamaha tri-moto 200, 85 200x with tons of work
    90s......89 Suzuki quad racer 250 (raced 250 A class for 6 years, late 90s.. custom framed 250x with long travel shocks and a built 350x motor.... built Honda 110
    00s...... chomeoly framed 350 RX with all the goodies (thanks to my bro)
    2012.....Replaced the 350x motor for a 444cc YZ426
    WWW.HREATV.COM
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  9. 03-01-2008, 05:36 PM #9
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    Quote Originally Posted by SWIGIN View Post
    440cc is small to what a 350x can be made into.....e start and the oil tank is just dead weight IMO
    I think the most you can go with a 350x before Frankensteining other bike parts on it is 452 right? The 400ex can go to 500.
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  10. 03-01-2008, 05:38 PM #10
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    i knew a guy who had a 570cc 350x......now it hardly finished a race but thats big

    not to mention that the 400ex cly studs like to pull out once you build them up
    80s......185 atc, Yamaha tri-moto 200, 85 200x with tons of work
    90s......89 Suzuki quad racer 250 (raced 250 A class for 6 years, late 90s.. custom framed 250x with long travel shocks and a built 350x motor.... built Honda 110
    00s...... chomeoly framed 350 RX with all the goodies (thanks to my bro)
    2012.....Replaced the 350x motor for a 444cc YZ426
    WWW.HREATV.COM
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  11. 03-01-2008, 05:41 PM #11
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    Quote Originally Posted by OldSchoolin86 View Post
    I think the most you can go with a 350x before Frankensteining other bike parts on it is 452 right? The 400ex can go to 500.
    depends what you call frankinsteining.....you need a big bore kit to get to 452 anyway

    now... add a 6mm powroll crank to that 452 and you got a 491.9cc
    80s......185 atc, Yamaha tri-moto 200, 85 200x with tons of work
    90s......89 Suzuki quad racer 250 (raced 250 A class for 6 years, late 90s.. custom framed 250x with long travel shocks and a built 350x motor.... built Honda 110
    00s...... chomeoly framed 350 RX with all the goodies (thanks to my bro)
    2012.....Replaced the 350x motor for a 444cc YZ426
    WWW.HREATV.COM
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  12. 03-01-2008, 05:55 PM #12
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    Quote Originally Posted by SWIGIN View Post
    not to mention that the 400ex cly studs like to pull out once you build them up
    That's an easy $50 fix

    I'm pretty sure you can't take a 350x to an overbore of 11mm even with a new sleeve. A 452x is an 86mm big bore with the 6mm stroke. To hit more then that I'm thinking you have to start using XR parts and toss the top end all together.

    Edit: I just ran the numbers that's still only a 430. LOL, I'll stop while I'm behind on the 350x knowledge.
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  13. 03-01-2008, 09:14 PM #13
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    no it isn't oldschooling...LA sleeve offers a big bore able to be bored to 452.

    one may find its way onto my build if it stretches out long enough. I just have to be through with it by summer. lol.
    Feedback thread: http://www.3wheelerworldforums.com/s...ad.php?t=78535

    Patiently waiting..
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  14. 03-01-2008, 11:18 PM #14
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    Quote Originally Posted by The Goat View Post
    no it isn't oldschooling...LA sleeve offers a big bore able to be bored to 452.

    one may find its way onto my build if it stretches out long enough. I just have to be through with it by summer. lol.
    Yeah I know, that's why I ducked out and said I'll quit while I'm behind
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  15. 03-02-2008, 07:19 AM #15
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    I'll admit to being clueless.

    one opportunity this would present would be to have a brand new engine in a trike. nothing beats new.
    Feedback thread: http://www.3wheelerworldforums.com/s...ad.php?t=78535

    Patiently waiting..
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