Kx100 powerband trouble

tmartz · 07-31-2008

I have a 2004 kx100, with fmf fatty pipe and silencer. Lately ive been haveing a problem. The bike will start up fine but when i go to ride the bike at high revs all the time the bike will bogg real bad and ill have to hold the throttle till it catches. It use to do it but just not really bad it was more of a aggervating thing then how it is now where i could barley ride in the pits or anywheres i just wouldnt be able to take the frustration. Please help

Sledder · 07-31-2008

Kind of the nature of the beast,it is a kx,it is a moto-x bike and that is somewhat how they are...but there are a few things that can often really improve the situation. Most often ,there is a HUGE difference between being jetted "perfect" vs." almost perfect"...the way to perfect jetting is done by actual testing only...read the jetting guide .

Also some aftermarket pipes can offer you more bottom end if that is what suits your riding...look for words in the piupe description like "gnarly" or "grunt" ...look at fmf or PC sites and do some reading.

Also V-force reeds,although expensive seem to always work well on small mot-x bikes to improve low end response.

Finally,some light engine work from one of the motocross engine ppeople will help,as a bit of compression increase(requiring you to use high test 92 gas) will help bottom end a lot.

Start with perfect jetting.

tmartz · 07-31-2008

Yeah i have a fmf fatty pipe with silencer i really dont have the extra money for reads im a little younger. But i have also messed with the screw that like goes into the carb thingking it was the idle screw i dont know if that could have made a difference. I was thinking about rejetting it maybe someone has specs for the same bike with the tempurture around 85 degrees. Keep the help coming i appreciate it.
Thanks

tmartz · 08-02-2008

its almost as if its gasping for air ive played with the idle screw and other screw thats like almost right under the idle screw i dont know what it is but i dont know if it messed something up

stuart1981 · 08-02-2008

that would be the air screw, pretty sure on that bike its, fully screw in not totally tight, just so it seats nicely, then 1 and a half to 2 turns out!

tmartz · 08-02-2008

thanks im going to do that right now and then test it out tommorow

tmartz · 08-03-2008

i tested it out today and there was a difference but the bog is still ther threw all gears just havent go it to 6th gear but im sure it will do it if it does it right up to 5th "only at high revs"
Anyhelp?

07-31-2008	#1 (permalink)
tmartz Newbie Join Date: Jul 2008 Posts: 12	Kx100 powerband trouble I have a 2004 kx100, with fmf fatty pipe and silencer. Lately ive been haveing a problem. The bike will start up fine but when i go to ride the bike at high revs all the time the bike will bogg real bad and ill have to hold the throttle till it catches. It use to do it but just not really bad it was more of a aggervating thing then how it is now where i could barley ride in the pits or anywheres i just wouldnt be able to take the frustration. Please help Last edited by tmartz : 08-05-2008 at 04:58 PM.

07-31-2008	#2 (permalink)
Sledder Forum Supporter Forum Supporter Join Date: Mar 2005 Location: NS Canada Posts: 1,223	Kind of the nature of the beast,it is a kx,it is a moto-x bike and that is somewhat how they are...but there are a few things that can often really improve the situation. Most often ,there is a HUGE difference between being jetted "perfect" vs." almost perfect"...the way to perfect jetting is done by actual testing only...read the jetting guide . Also some aftermarket pipes can offer you more bottom end if that is what suits your riding...look for words in the piupe description like "gnarly" or "grunt" ...look at fmf or PC sites and do some reading. Also V-force reeds,although expensive seem to always work well on small mot-x bikes to improve low end response. Finally,some light engine work from one of the motocross engine ppeople will help,as a bit of compression increase(requiring you to use high test 92 gas) will help bottom end a lot. Start with perfect jetting. __________________ 04 MS 1640 Thunder 100 in kit/cams Race ported heads by "dynoray" Thunder air V&H Propipe PC3

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07-31-2008	#3 (permalink)
tmartz Newbie Join Date: Jul 2008 Posts: 12	Yeah i have a fmf fatty pipe with silencer i really dont have the extra money for reads im a little younger. But i have also messed with the screw that like goes into the carb thingking it was the idle screw i dont know if that could have made a difference. I was thinking about rejetting it maybe someone has specs for the same bike with the tempurture around 85 degrees. Keep the help coming i appreciate it. Thanks

08-02-2008	#4 (permalink)
tmartz Newbie Join Date: Jul 2008 Posts: 12	its almost as if its gasping for air ive played with the idle screw and other screw thats like almost right under the idle screw i dont know what it is but i dont know if it messed something up

08-02-2008	#5 (permalink)
stuart1981 Finally Got Into First Gear BTK Beginner Join Date: Jan 2008 Posts: 72	that would be the air screw, pretty sure on that bike its, fully screw in not totally tight, just so it seats nicely, then 1 and a half to 2 turns out!

08-02-2008	#6 (permalink)
tmartz Newbie Join Date: Jul 2008 Posts: 12	thanks im going to do that right now and then test it out tommorow

08-03-2008	#7 (permalink)
tmartz Newbie Join Date: Jul 2008 Posts: 12	i tested it out today and there was a difference but the bog is still ther threw all gears just havent go it to 6th gear but im sure it will do it if it does it right up to 5th "only at high revs" Anyhelp?

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