Maintenance & Technical > KX250 / KX125

kx250 knocking noise

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kx250-818:
Hey guys I'm a new rider i recently bought a KX250. On my last ride at Dove Springs i was riding my KX250 in 5th gear and i had it pinned for about 4-5min and after this i started hearing a knocking noise in the motor. Might i add that i had to change 2 spark plugs in the last 3 rides. I dont know what this noise can be from its not to loud but notice able and it stays constant. Please help. :|

Wizzy214:
 welcome to kxriders.

how new are you to 2-strokes?

how loud is the noise?

start your bike, are you hearing a knocking noise? pull the clutch lever in, did it go away?  if it did go away thats normal. if it didnt might have some bearing failure. and its time for a tear down and some new parts,

GDubb:
I hope you are exaggerating the 4 - 5 mins part... Deffinitely not good to be pinned WFO in 5th for 4 - 5 mins. Good chance you hurt something.


-G

kx250-818:
Thanks for the response guys, im a pretty new ridder i have had the bike for about 5months i have never owned any other bikes, and yes i did ride my bike 4-5mins pinned in 5th gear not knowing i cant do this im just becoming familar with dirt bike so i didn't know. say it is a bearing how hard is it to change it im fairly good with tools and my hands i have worked on several cars so i familar with how things run and if it is my bearing what should i do. Also the noise doesn't go away when i clutch and it loud enough to were its noticable. I have also had to change my spark plug 2 in 3rides. Could this have to do anything with it. thanks again.  :oops:

hughes:
Getting the proper service manual for your bike will help you get started. To run a bike pinned in 5th for long periods of time your engine/carb/cooling system would need to be propery tuned for that type of racing or riding. Not uncommon for desert racers to keep them pinned for very long peroids of time but their bikes are set up and tuned for that type of riding.

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