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Thread: cdi mod for your 400ex

  1. #1
    Join Date
    Mar 2010
    Location
    ohio
    Posts
    53

    cdi mod for your 400ex

    I am sure some of you this but I just thought I would pass this on.
    Many aftermarket CDI boxes sold for the 400EX are actually stock Honda XR250R boxes. The unmodified XR250 box will give you about 800 more rpm on top and a faster ignition curve. You can purchase this directly from your local Honda dealer and save money.
    Order: CDI for Honda XR 250 1992-2004
    Part #30410-KCE-671
    jesus built my atv, it's a love affair

    2003 660
    hotcam
    white brothers R4 slip on
    wrapped fmf header
    fmf jet kit
    durablue power filter kit
    wicked +2 +1 a-arms
    durablue axle
    and of course bud lite graffix

    2008 KTM 525 XC
    Akrapovic slip on
    jd jet kit

    1998 330ex
    power roll cam
    330 big bore
    fmf mega max pipe
    wrapped header
    +2 +1 a-arms
    durablue axle

  2. #2
    Join Date
    Aug 2008
    Location
    Central NJ
    Posts
    11,200
    Interesting, how does the EX respond to the 250r box besides 800rpm more?

  3. #3
    Join Date
    Mar 2010
    Location
    ohio
    Posts
    53
    it will make more spark which meens better fuel burn insult meens more power now im not saying it will give u 10 more horse but it is noticeable. it will also give u a little better throttle responce.
    jesus built my atv, it's a love affair

    2003 660
    hotcam
    white brothers R4 slip on
    wrapped fmf header
    fmf jet kit
    durablue power filter kit
    wicked +2 +1 a-arms
    durablue axle
    and of course bud lite graffix

    2008 KTM 525 XC
    Akrapovic slip on
    jd jet kit

    1998 330ex
    power roll cam
    330 big bore
    fmf mega max pipe
    wrapped header
    +2 +1 a-arms
    durablue axle

  4. #4
    Join Date
    Aug 2008
    Location
    Central NJ
    Posts
    11,200
    Originally posted by raptor660103
    it will make more spark which meens better fuel burn insult meens more power now im not saying it will give u 10 more horse but it is noticeable. it will also give u a little better throttle responce.
    Seems worth it, it plugs right in?

  5. #5
    Join Date
    Apr 2005
    Location
    WI
    Posts
    8,777
    yeah it does, steve
    Screw it... after a half hour of trying it just isnt worth jacking with a sig.

  6. #6
    Join Date
    Aug 2008
    Location
    Central NJ
    Posts
    11,200
    Cool, ill put it on thelong list.

  7. #7
    Join Date
    Apr 2009
    Location
    Las Vegas, NV
    Posts
    1,289
    I'm not sure they're any cheaper than the "aftermarket" CDIs listed for the 400EX. I just checked DGY and they sell the XR250 CDI for $100. And they are considerably cheaper than most OEM part stores. You can get the AMR Stage 3 CDI for like $80 on eBay. I still don't believe CDIs are worth the money, anyways.
    '05 TRX400EX:

    |White Bros. E-Series Exhaust|Stock Header w/ Welds Ground|Gearing: Trail - 14/39, Dunes - 13/39|Primary Drive Sprockets & Gold X-Ring Chain|Sparks +6° Key|42mm Keihin Carb: 165 Main, 52 Pilot|ESR Airbox Eliminator Kit|Tinner Scoops|Trail Tech Torch Lights|Maier Scooped Hood|Tusk Risers|TAG T2 Bars|MSR AOF Clutch Perch & Lever|Burgard +2 +1 A-Arms|G-Force Extended Hubs|KFX 450R Shocks|DirtSkins Shock Covers|IMS-Roll Classic Bumper|AC Racing Blackline Pro-Peg Nerfs|ITP Holeshot H-Ds on Stock Black Wheels|Skat~Trak Extreme Paddles & GBC Dune Tracker Fronts on DWT Blue Lables|

    '85 Chevy K5 Blazer:

    |5.0L V8|Flowmaster 40 Series|BFG All-Terrains|Pro Comp Shocks|

    '73 "Q-Code" Mach 1 (Restoring):|351C-4V|Holley 600 (Something Bigger Soon)|Edelbrock Manifold|Cammed|10:1 Pistons|Hooker Longtubes|Glasspacks (New Thrush Packs or Hooker Aero Chambers Soon)|C4 Auto (ProMotion T-5 Eventually)|Unknown Gears|

  8. #8
    Join Date
    Oct 2005
    Location
    Charleston S.C.
    Posts
    885
    350x plugs in and has no limit!!!!! but yes there overrated. i like my stock cdi just to be safe. ppl put them on, rev the piss out of it and drop valves.

  9. #9
    Join Date
    Apr 2008
    Location
    W.P.B. FL
    Posts
    2,457
    Did you guy's know that you can actually use almost "ANY" cdi box.

    Really, all you do is re-wire it to your application.

    90% of scooter's and chinese atv's have the same wiring and plug's as a 400ex also, the timing curve and sometimes rev limit is decreased alot in these box's but some do work.

    We once used a kawasaki sportbike coil and cdi on a 1984 suzuki lt250ef atv. It really didnt make any difference on performance with that atv, but did work really well.
    400ex hybrid Finished!
    http://www.youtube.com/watch?v=YMDIAw8UskQ

  10. #10
    Join Date
    Mar 2010
    Location
    ohio
    Posts
    53
    it will make more spark which meens better fuel burn insult meens more power now im not saying it will give u 10 more horse but it is noticeable. it will also give u a little better throttle responce.
    jesus built my atv, it's a love affair

    2003 660
    hotcam
    white brothers R4 slip on
    wrapped fmf header
    fmf jet kit
    durablue power filter kit
    wicked +2 +1 a-arms
    durablue axle
    and of course bud lite graffix

    2008 KTM 525 XC
    Akrapovic slip on
    jd jet kit

    1998 330ex
    power roll cam
    330 big bore
    fmf mega max pipe
    wrapped header
    +2 +1 a-arms
    durablue axle

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