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Thread: Jetting help

  1. #71
    Join Date
    Oct 2009
    Location
    Spain
    Posts
    97
    My buddy has jetting problems a high rpm. Her bike is 06 all stock with k&n filter, lid on and pro circuit full exhaust. Now is running 150 dynojet(165 keihin) for main jet, stock needle and 3 turns f/a (1500ft). thanks in advance
    06 400ex Uni foam filter, Dynatek Cdi, Sparks key , Fat boy4, A arms Alba Racing , 450r front shocks , Ace Fabrication Swing Arm, Rad Bearing Carrier, Durablue axle , Asv , Streamline , Galfer , Terrycable dual gaser

    08 gas gas wild 250/300 k&n air filter , keihin , vforce3 , gasgas ec cdi , PTR/Fatboy2 , peps shocks , ktm handlebar , 400ex thumb throttle , magura front master cylinder , brembo front calipers , ajp hydraulic clutch , rpm 400ex axle , 450r rear brake and more...

  2. #72
    Join Date
    Apr 2005
    Location
    WI
    Posts
    8,922
    what are the problems she is having. may be a bit rich imo i would go with a 160 and it would probably be just about perfect. It is most likely doggy with it being rich, try a 162 first and see how the plug looks after a couple of good wot runs. steve
    2019 Maverick X3 XDS Turbo R
    2003 TRX 400EX
    2016 HONDA RANCHER

  3. #73
    Join Date
    Oct 2009
    Location
    Spain
    Posts
    97
    sorry is a friend wich has jetting problem. He only tell me that has jetting problem a high rpm. Tomorrow ask him what problem has. thanks
    06 400ex Uni foam filter, Dynatek Cdi, Sparks key , Fat boy4, A arms Alba Racing , 450r front shocks , Ace Fabrication Swing Arm, Rad Bearing Carrier, Durablue axle , Asv , Streamline , Galfer , Terrycable dual gaser

    08 gas gas wild 250/300 k&n air filter , keihin , vforce3 , gasgas ec cdi , PTR/Fatboy2 , peps shocks , ktm handlebar , 400ex thumb throttle , magura front master cylinder , brembo front calipers , ajp hydraulic clutch , rpm 400ex axle , 450r rear brake and more...

  4. #74
    Join Date
    Oct 2009
    Location
    Spain
    Posts
    97
    Originally posted by honda400ex2003
    what are the problems she is having. may be a bit rich imo i would go with a 160 and it would probably be just about perfect. It is most likely doggy with it being rich, try a 162 first and see how the plug looks after a couple of good wot runs. steve
    The jetting problems solved, thanks
    06 400ex Uni foam filter, Dynatek Cdi, Sparks key , Fat boy4, A arms Alba Racing , 450r front shocks , Ace Fabrication Swing Arm, Rad Bearing Carrier, Durablue axle , Asv , Streamline , Galfer , Terrycable dual gaser

    08 gas gas wild 250/300 k&n air filter , keihin , vforce3 , gasgas ec cdi , PTR/Fatboy2 , peps shocks , ktm handlebar , 400ex thumb throttle , magura front master cylinder , brembo front calipers , ajp hydraulic clutch , rpm 400ex axle , 450r rear brake and more...

  5. #75
    Join Date
    Jul 2009
    Location
    PA
    Posts
    59
    My brother has a 07 400ex with stage 2 hot cam, ehs power lid, k&n air filter, 6degree sparks timing key, full hmf sport exhaust and rest of bike is stock.
    He bought a jet kit and the jets r us jet kit recommended using the largest jet and working your way down. Which is a 180. With the 180 in the carb the quad seems to run good all but on a hard pull in second gear. it seems to bog when on it hard in 2nd. Does this mean he should step down in main jet size? or buy some larger jets and keep trying?
    any help would be deeply appreciated.
    thanks
    --->Carry in
    <---Carry out
    2001 Honda 426ex 11:1 compression
    HotCams Stage2
    Full HMF Sport Exhaust
    K&N Filter & Lid
    AMR Monster Coil & CDI
    Edelbrock Carb
    YFZ front calipers
    Oil Cooler Fan

  6. #76
    Join Date
    Aug 2009
    Location
    Michigan
    Posts
    324
    I have a 03 400ex with a FMF Tunable T4 slip on and a K&N cone filter with no lid. Ordering a FMF Power Up Jet Kit and need to know what jets to start with. I am at 797 FT and my temp is usually 50-80 degrees fahrenheit. Any help would be great.
    03 400ex, AC nerf bars, k&n open lid intake, Pro Circuit Tunable t4 slip on, Ground Welds Mod, FMF Power Up Jet Kit (dj170 main, 3rd clip, 3 turns out on the A/F)

  7. #77
    Join Date
    Oct 2005
    Location
    Dingess, West Virginia
    Posts
    191

    400ex jetting

    Exhaust glows bright red, can be seen VERY easy in the dark only after minutes of idle.

    Gas is getting into my engine oil.

    From what i've seen I know this.

    185 main, 38 pilot. Port/polished (atleast from what I see, and feel.) t4 full exhaust system, moded air box lid, k&n filter cover, K&n filter,

    Also, the quad doesnt lug, its fast, responsive as can be. Whats causing this? Tons of compression, starts right up, after about 1 second of holding start if that. Basically as soon as I touch it.

    What other mods could this have to run good with that jetting? Also, how if it is running lean from the pipes glowing, is there gas getting into my oil?
    400ex

    T4 pro circut full exhaust, K&N air filter, rejetted, nerfs alum with red netting, maier racing front/maier back(fighting red), Pro taper handle bars, Razr back, holeshot front, wheel spacers on front.
    Update on the rest soon.

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