KFX 400 Cheap Mods - ATVConnection.com ATV Enthusiast Community

quadsk8er97 · #1 (**permalink**) 08-20-2009, 12:06 AM

Hey everyone, My KFX 400 has a full Trinity Stage 5 Exhaust system and a K&N Air filter, and I was just wondering, is there any cheap mods I can do to it? Thanks.

quadsk8er97 · #2 (**permalink**) 09-07-2009, 12:04 AM

C'mon guys, anything?

lt230sman · #3 (**permalink**) 09-07-2009, 01:54 AM

hmmm... how cheap?

you could re-gear to better suit your application

you could get an upgraded accelerator pump cover for supposedly better throttle response

you *MAY* be able to get a thinner base gasket for increased compression. im not really sure about on quads, but i know the drz400 guys do it all the time.

FASTFATBOY · #4 (**permalink**) 09-07-2009, 03:35 AM

YFZ carb., adjustable CDI, shave the head .020-.025 a little extra compression, maybe lighten the flywheel for the cheap route.

jflib74 · #5 (**permalink**) 09-07-2009, 09:02 PM

I just put a 13 tooth front sprocket on my kfx 400 stock is 14 what a difference on the bottom end . gonna mess with the rear next got it off rocky mountain atv for like 10.00 bucks. hardly any difference from stock, weight wise etc.

quadsk8er97 · #6 (**permalink**) 09-08-2009, 10:15 AM

Thanks for the info guys, I'm going to order the 13 tooth front sprocket, and jflib74, dont you loose top end when you gain low end? Thanks

godsmackKFX400 · #7 (**permalink**) 09-08-2009, 05:28 PM

You didnt say, but have you jetted your carb? I've got an 03 KFX with the FMF PowerCore 4, K&N, Jetted carb, Big Gun CDI. I went down to the 13 tooth since I ride wooded trails more than just straight haulin a$$. Big differance in low end. I dont do much straight line running so loosing a bit off the top really dident hurt my feelings. I ride the trails so much I dont even know if I have 5th gear anymore.

godsmackKFX400 · #8 (**permalink**) 09-08-2009, 05:34 PM

im lovin those black wheels. I just got my 03 put back together after painting the frame black. The black and lime green looks sweet!

quadsk8er97 · #9 (**permalink**) 09-08-2009, 11:17 PM

Thanks man, I love the black wheels too! I gotta get new tires though, and yes my carb is jetted, and I'm going to get the 13 tooth sprocket, but I usually ride alot of trails and do some jumps, and I never really get out of 3rd or 4th gear, so will I notice a big loss in power? Thanks

quadsk8er97 · #10 (**permalink**) 09-08-2009, 11:17 PM

Thanks man, I love the black wheels too! I gotta get new tires though, and yes my carb is jetted, and I'm going to get the 13 tooth sprocket, but I usually ride alot of trails and do some jumps, and I never really get out of 3rd or 4th gear, so will I notice a big loss in power? Thanks