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Thread: Z-400 won't idle!?

  1. 03-02-2003, 04:56 PM #1
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    Question Z-400 won't idle!?

    My friend has a Z-400. He just put a big gun slip on, CFM performance airbox, K&N filter w/outerwear and has jetted it. but the problem is that it won't idle and you have to give it a little gas when u start it or it won't start at all. when he get's it started and lets off the gas it just dies. he's tried changing the pilot jet, and messed with the needle but it hasn't helped any. does anybody know what the problem might be? We live in NY and the elevation is a couple hundred feet above sea level. thanks in advance.
    **Red 00 Honda 400EX w/ Pro Circuit T-4 Slip-on w/modded stock headers, K&N filter w/outerwear, no choke, custom airbox lid, Stage 2 Dynojet 165MJ, and 42PJ, Maxxis Razr's on stock rims(fronts flipped), Herrmann Racing Bearing Carrier, polished air scoops, Renthal Bars, DID chain, Shockwears, black Ceet gripper seat cover, Moose CR clutch perch and lever, R&R Motorsports parking brake block off, DG swingarm skidpalate, homemade diamond-plate aluminum chassis skidplate, AC Nerf Bars, Nacs peg extenders, cut fenders. *Coming soon... a set of Holeshot 20x11x9 XCR's, and maybe an MSR Raptor clutch perch, and maybe a TrailTech speedometer.
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  2. 03-02-2003, 07:01 PM #2
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    Did you try messin with the idle screw on the carb. Mine got messed up on my 400ex today so i had to fix it. It did exactly what you said. It wouldnt idle but would start if i gave it gas. Good luck.
    2002 Yellow Honda 416EX!

    2002 Yellow 416EX mods:
    JE 10.8:1 416 kit, Hotcams stage 2, White Brothers E- Series slip on, 155 main jet and 42 pilot, no choke, Curtis Sparks air filter, No airbox lid, Ground welds on headpipe, Renthal bars w/ full diamond grips, White Brothers front bumper, PRM skid plate, and Black Shockwears.

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  3. 03-02-2003, 08:20 PM #3
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    nakomis0
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    Re: Z-400 won't idle!?

    whats size pilot does he have in it? Does it have fresh gas?

    I might be going out on a limb here but... .did you try turning the idle screw?
    440, Ross 11.5:1 piston, Web cam 479 grind, race port & polish, oversized valves, hardened rockers, CRF450 cam chain, 39mm FCR carb, lightened Flywheel, Stock clutch, WB CDI box, K&N filter , WhiteBrothers E-Series full exhaust, Sidewinder Chain, 15/36 gearing, open airbox, LSR Axcaliber +3.5 axle, Houser Racing +2 a-arms, Elka triple rate, fully adjustable front shocks, +1.25 Houser swingarm, Tag Metals X5 bars, Arens +1 steering stem, Muscle steering dampener, Stainless Steel brakelines, HeatSeeker temp. guage, Pro Design kill switch, DG Pro Series nerfs, 8 run Hauler paddles. ~~http://www.sounddomain.com/id/trick440ex~~
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  4. 03-02-2003, 08:38 PM #4
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    it will idle if we turn the idle screw up kinda high but he doesn't want it that high. it just won't idle like it did before he got all the mods. i'm not sure what pilot he has but he's tried a few different ones and it didn't really help.
    **Red 00 Honda 400EX w/ Pro Circuit T-4 Slip-on w/modded stock headers, K&N filter w/outerwear, no choke, custom airbox lid, Stage 2 Dynojet 165MJ, and 42PJ, Maxxis Razr's on stock rims(fronts flipped), Herrmann Racing Bearing Carrier, polished air scoops, Renthal Bars, DID chain, Shockwears, black Ceet gripper seat cover, Moose CR clutch perch and lever, R&R Motorsports parking brake block off, DG swingarm skidpalate, homemade diamond-plate aluminum chassis skidplate, AC Nerf Bars, Nacs peg extenders, cut fenders. *Coming soon... a set of Holeshot 20x11x9 XCR's, and maybe an MSR Raptor clutch perch, and maybe a TrailTech speedometer.
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  5. 03-02-2003, 09:10 PM #5
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    sounds like what my 400 did after i put the carb back together, i just adjusted the idle and its fine
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  6. 03-02-2003, 10:36 PM #6
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    My 400ex actually idles better now with all my mods. When it was stock it wouldnt idle for s**t.
    2002 Yellow Honda 416EX!

    2002 Yellow 416EX mods:
    JE 10.8:1 416 kit, Hotcams stage 2, White Brothers E- Series slip on, 155 main jet and 42 pilot, no choke, Curtis Sparks air filter, No airbox lid, Ground welds on headpipe, Renthal bars w/ full diamond grips, White Brothers front bumper, PRM skid plate, and Black Shockwears.

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    Elka Triplerates, 39 FCR carb, Head port and polish.
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  7. 03-02-2003, 10:44 PM #7
    jb400exxx's Avatar
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    my 400ex idles better now with my mods too.
    **Red 00 Honda 400EX w/ Pro Circuit T-4 Slip-on w/modded stock headers, K&N filter w/outerwear, no choke, custom airbox lid, Stage 2 Dynojet 165MJ, and 42PJ, Maxxis Razr's on stock rims(fronts flipped), Herrmann Racing Bearing Carrier, polished air scoops, Renthal Bars, DID chain, Shockwears, black Ceet gripper seat cover, Moose CR clutch perch and lever, R&R Motorsports parking brake block off, DG swingarm skidpalate, homemade diamond-plate aluminum chassis skidplate, AC Nerf Bars, Nacs peg extenders, cut fenders. *Coming soon... a set of Holeshot 20x11x9 XCR's, and maybe an MSR Raptor clutch perch, and maybe a TrailTech speedometer.
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  8. 03-03-2003, 12:13 AM #8
    thumpinex
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    jason just a thought when he turned the neddle in he didnt crank on it right he my have brokein ...knowing brandon :P hahaha
    03 yellow 400 ex
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  9. 03-04-2003, 12:50 AM #9
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    he didn't break anything that i know of, you could still adjust the idle but it just doesn't idle like it should. it idle to high, then when u lower it, it dies.
    **Red 00 Honda 400EX w/ Pro Circuit T-4 Slip-on w/modded stock headers, K&N filter w/outerwear, no choke, custom airbox lid, Stage 2 Dynojet 165MJ, and 42PJ, Maxxis Razr's on stock rims(fronts flipped), Herrmann Racing Bearing Carrier, polished air scoops, Renthal Bars, DID chain, Shockwears, black Ceet gripper seat cover, Moose CR clutch perch and lever, R&R Motorsports parking brake block off, DG swingarm skidpalate, homemade diamond-plate aluminum chassis skidplate, AC Nerf Bars, Nacs peg extenders, cut fenders. *Coming soon... a set of Holeshot 20x11x9 XCR's, and maybe an MSR Raptor clutch perch, and maybe a TrailTech speedometer.
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  10. 03-04-2003, 03:54 AM #10
    Big - D Racing
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    I know what the problem is..... IT"S A SUZUKI Dump it and get a honda. I would wait for the 450ex to come out, it's going to blow everything else apart.
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