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Thread: thinking of juicing my motor up..suggestions

  1. 12-13-2004, 10:35 AM #1
    platinum350
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    thinking of juicing my motor up..suggestions

    Ok, I see a lot of you are putting the high compression pistons w/ cams. And of course going w/ the 416 to 440 kit. I am new to this so bare w/ me. What I want to know is, what should I do. I see on ebay they list the stock size piston but high compression. Would that make a noticable difference? Would I need a upgraded cam to go w/ that?
    Or should I just get the 440 kit? Can I just get the new kit and a cam and be done?
    Of course I will have my carb rejetted a pipe & filter. I really don't want to spend too much money so any suggestions would be appreciated!
    Thanks!!
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  2. 12-13-2004, 12:06 PM #2
    400exrider707's Avatar
    400exrider707
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    If you go with a 440 kit expect to pay a lot more. You will need more things to be done to your engine as well to get the full potential out of a 440, like bigger valves, hardface the rockers, stiffer valve springs and a bigger carb and yada yada yada. I'm in the same boat as you. I am wanting to bump my power up and do a fresh top end, I think I'm going with either the 406 or 416 bore w/ JE piston (maybe ross haven't decided yet) stage 1 hot cam and probably a new cam chain while I've got it apart and valve seals. I'm thinking this is like middle of the road, not cheapin out and just throwing in rings, but not going all out either. I'm a broke *** college kid so this will have to do for now.
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  3. 12-13-2004, 01:48 PM #3
    cals400ex
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    you will want a cam. that cam makes a large difference. i would get a 406 or 416 with a cam. you will be able to get these, gaskets, and the boring for less than $400. you need to install it though. you will get a nice increase of power.
    2005 450r

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  4. 12-13-2004, 03:41 PM #4
    platinum350
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    see, I could see spending $400 on a 416 kit. Other than the cam and installing would that all I would need to do. Or will I need to hardface the rockers, stronger springs and all that?
    '15 KX250F FMF 4.1 exhaust

    SOLD - '07 400ex (black) bone stock

    SOLD - '02 400ex(yellow) w/ 450r Front shocks, omf shrouds, Holeshots xc, IMS front bumper, nerf bars, durablue axle +2, renthal bars, uni filter, EHS racing airbox lid, HMF polished slip on, carb jetted w/ a 165main, 2nd from the bottom needle posistion.
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  5. 12-13-2004, 03:43 PM #5
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    400exrider707
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    You dont need to, but I'm thinking I'm going to do a couple of things as preventative maitenance seeing as Ill have the thing apart anyways. i think i'm just going to do valve seals and heavy duty cam chain.
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  6. 12-13-2004, 04:15 PM #6
    RAPTORAZ
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    Here's my list:

    Stage II Hotcam = $125
    Ross 10.8:1 piston = $125
    Bore cylinder and fit piston = $35
    Honda gaskets = $25
    Labor = FREE(did it myself)

    Dynoed at 34 RWHP(piped YFZ's typically dyno at 29 RWHP on this same dyno) and has been trouble free for two years running on 91 octane fuel.
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  7. 12-13-2004, 05:34 PM #7
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    400exrider707
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    Thats basically what I'm going to do except I only want a stage 1 hotcam cause I ride a lot of trails too and do SX more than MX so I need the bottom end. Who did you get your ross piston through??
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  8. 12-13-2004, 05:45 PM #8
    RAPTORAZ
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    Originally posted by 400exrider707
    Who did you get your ross piston through??

    I bought it directly from Ross.
    2001 Raptor - Kenz built 727
    2007 Raptor 700 - GYTR intake, PCIII, and LTE's
    2006 F350 - lifted with 35's on 20's, MBRP 4 inch turbo-back, Innovative Diesel tuned
    1989 Mustang 5.0 - N2O
    1965 Mustang 5.0 5pd.
    1963 Fairlane 500 5.0 C4
    1997 Cherokee - lifted on Mickey's
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  9. 12-13-2004, 06:26 PM #9
    Kennethyfz450
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    Dynoed at 34 RWHP(piped YFZ's typically dyno at 29 RWHP on this same dyno) and has been trouble free for two years running on 91 octane fuel. [/B][/QUOTE]

    thats a bunch of bs... a stock yfz puts more to the rear wheels.......
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  10. 12-13-2004, 06:33 PM #10
    cals400ex
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    i am wondering if he ment 39, which i thought a stock one put out that.
    2005 450r

    *sold* 2001 400ex

    "If you think you can, you can. If you think you can't, your right."

    "A leader will take you where you want to go. A great leader will not necessarily take you where you want to go but where you ought to be."

    "If you want to do something, you will find a way; if you don't, you'll find and excuse!"

    "Its not aptitude but attitude that determines your altitude."
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