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Old 05-18-2011, 06:35 AM   #1
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Default Best kfx 400 mods

i just bought an 03 kfx 400 bone stock and i wanna know the best mods for this bike i know that a 13 t sprocket is a good upgrade. but would like to know some more.

thanks.
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Old 05-18-2011, 11:36 AM   #2
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hi, just read my sig. my rips and i can take stock 450s all day long.
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2005 KFX 700
AMR 840, PORT AND POLISH, +4 VALVES, XXX cams BOONDOCKER NOS, 38mm Carbs with Custom Intakes, VENFORCER +4 EXTENSION, drag pipe, VFJ STAGE 3 WITH SECONDARY, K&N, MARVIN SHAW HILL SHOOTER'S FRONT AND REAR, FRONT LOWERING, O/B SPRING WITH WEIGHTS, DYNATECH CDI, 25 x 11 x 10 SKAT TRACK RIPPERS
04 KFX 400
440 BIG BORE KIT,13.5-1 wiseco, DYNATECH CDI, K&N, LRD EXHAUST, K&N AIR BOX LID, Fasst Flexx bars, ODI grips, 450R front shocks
06 BRUTE FORCE 750i
2 INCH LIFT snorkeled, 28 in. Mudzilla TIRES
ITP SS112 12X7 rims, dynatek cdi, K&N AIR FILTER
KFX 80
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Old 05-18-2011, 01:41 PM   #3
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What type of riding/racing do you plan to do?
Beyond the 13T sprocket for more juice, I recommend:
Airbox: Remove lid and snorkel, or Mod lid, Uni Filter, Honda 400EX air boot
Carb: FCR conversion (from a YFZ450-highly recommended) or at least rejet stock BSR
Motor: (the $kie$ the limit) but afforable mods are cams, DRZe kit.
Exhaust: any high flow FULL exhaust. No point in messing with slip on mufflers with the availability of good used full set-ups for half the price of a new slip on.
Suspension: Track or trail?
Brakes: YFZ front calipers, Honda Master cylinder, KTM stainless lines.

I recommend checking all the bearing too, these had little to no grease in them from the factory and it's real likely you need to start with replacing axle bearings and front wheel bearings.

Oh yeah, and check out suzukicentral - there's a ton of tuning tips and used parts for sale, and bunch of people who know these bikes top to bottom

Last edited by sandman74; 05-18-2011 at 02:08 PM.
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Old 05-19-2011, 11:32 AM   #4
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Thanks both of you but randall could you let me see a pic of your 400 please!
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Orange kfx 400
-Tusk Nerf Bars
-Sti Sport Alloy Wheels (black)
-Itp Holeshot Tires
-Pro Taper Bars
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Old 05-21-2011, 10:44 AM   #5
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Read my Sig. The single best mod was the carb.
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04 KFX400,Crasko 450bbk, Crasko P&P,DRZ flywheel,Web cams,custom Yosh header w/FMF PC4,FCR39,ESR intake,Leager A arms,ESW modded 450r shocks,GTT rear link,Tag stem and bars,JBcustoms frame gussets,LSR axel,YFZ450 front calipers.

99 Lakota, DG excellerator,400ex carb,CWR 335 kit,CWR .390 cam,JB custom intake,Crasko P&P head,400ex rear hubs, Modified KFX400 front suspension.

88 Tecate 4 mostly stock Bills pipe and works shocks.

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