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Thread: what is the best engine to fit in a 350X

  1. 03-14-2004, 05:23 PM #1
    Trikemaker
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    what is the best engine to fit in a 350X

    i would like to have opinions for what motor i must use to fit in my 350X for my atc will be more performant...

    400ex engine or 600cc in-line 4cyl?????????
    1986 ATC bigred250es
    1985 ATC 350X
    1985 ATC 250SX (Sold)
    LT230S+RM250=quadracer 250 (Custom project)
    1997 MXZX 440
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  2. 03-14-2004, 06:37 PM #2
    ATC crazy's Avatar
    ATC crazy
    ATC crazy is offline Power User Lord of the trike
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    Obviously the 400EX motor would fit in there better than the 600. The EX's motor has the same HP as the 350X, but definately more aftermarket power upgrades.

    The 600 would be a cool engine swap to do...but there wouldnt be much use for it except at the dunes, drag strip, or dirt roads.

    Go with the 400EX motor and put a 440 kit on it with an E-Series pipe, and WB Cam.
    [20:55] <waterpumper> putting a racing pipe on a Foreman is like putting a high dollar bikini on a 400 pound chick...just because it fits doesn't mean it looks cool
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  3. 03-14-2004, 07:53 PM #3
    Trikemaker
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    does the 400ex have same hp that the 350X and why??...the oils coolers?
    1986 ATC bigred250es
    1985 ATC 350X
    1985 ATC 250SX (Sold)
    LT230S+RM250=quadracer 250 (Custom project)
    1997 MXZX 440
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  4. 03-14-2004, 08:38 PM #4
    short4stuff's Avatar
    short4stuff
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    kept the 350x engine and get a 452 big bore kit that way you will have more than a 400ex can get plus an extra gear.
    '04 450r, hr +3 stroker, s2 hotcam
    '84 Honda 200x
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    Previous rides 82 Yamaha yt175, 85 Yamaha 225DR, 84 Honda 200M, Ski-doo Olympic 340
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  5. 03-14-2004, 08:48 PM #5
    84250r
    84250r is offline Clean enough to eat a potpie off of Teaching quads a lesson
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    Quote Originally Posted by Trikemaker
    does the 400ex have same hp that the 350X and why??...the oils coolers?

    The EX's motor has the same HP as the 350X, but definately more aftermarket power upgrades
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  6. 03-14-2004, 09:07 PM #6
    Trikemaker
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    ok ok...but i also found a 2stroke 250cc of yfz...what's the best choice...4stroke or 2stroke
    1986 ATC bigred250es
    1985 ATC 350X
    1985 ATC 250SX (Sold)
    LT230S+RM250=quadracer 250 (Custom project)
    1997 MXZX 440
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