Maintenance & Technical > KX250 / KX125

extremely high rev sometimes???

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Motorrad:
Sticky needle and seat....   replace em...

and do a leakdown test..

DFL BIG BORE:
my k5 does always does this too! before and after rebuilding it,i drain carb when done riding and drain tank(i use c12).when its time to ride fill it up ,turn on gas lean over for 5 seconds,kick it over and rpm go sky hi,kill it,fire it right back up. then fine all weekend.only when sitting dry for a few weeks.bouncing around on a trailer gas has spilled out of the float,kinda like running out of gas the rpms go insane. mabey check your vent hoses,and gas cap vent.mabey a slight "air lock"on your gas tank

elmo:
1, turn petrol off leav bike running, Does it rev high before the petty runs low?
2, Remove pipe for petrol from carb leave bike running, Does it rev high before dying?

Yes to 2 is normal, yes to 1 means at some point your bike is sucking air into the carb from somewhere... Lol not that that helps much!

don46:
I have a bike that does the same thing, and I do know how to fix it but I'm to lazy to do it. So, heres the problem, your too rich on the needle and maybe pilot as well and to get it to idle you turn in the idle screw, to get it to idle creating a larger opening between the slide and body. As we all no colder temps create a leaner condition so when you start it it is a bit on the leaner side and your putting more air in causing more revs, once warmer you get back to the richer condition and it idles fine. Other than your bike running a bit rich, and you don't let it rev to the moon using the kill switch to keep it from revving to high you really don't have a huge problem. Most Kawasakis are jetted to rich from the factory, especially the needle, it is not un common to drop 3-4 needle sizes on a 250 as well as main and pilot. Jetting is an art and does take time to get right, what works for me won't necessarily work for someone else, remember temperature and humidity play a big part in jetting. At the race track it is amazing how many bikes you see that aren't jetted properly, 250's are the most common because they run well even if jetted wrong, 125's on the other hand have to be jetted right to be competitive on a pro level.

so there you have my .02 on the issue.

hughes:
I agree with don46 on this one. I need to address this on my YZ250 as it does the same thing.

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