Maintenance & Technical > KX250 / KX125

kx250 knocking noise

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Hillclimb#42:
Aren' t you guys missing the obvious here? New to riding and pinned in 5th for 5min. Thats haulin'. Welcome to the site. I've been ridin' a while now and am sure 5th is like new. Don't get there much. I will hold the gas on pinned in second alot though. Cherry red silincers are not unusual. Smoking for 5 minutes after parked is knowing you're riding the thing right.
  Back to the issue, Alot of things can knock. You think its every time the crank turns? Clutch being engaged has no affect? Load on motor have affect? You get the idea. Eliminate what you can. Its not like a rod knocking on a car. Fouling plugs could also be a number of things.
I could ask more and you could add more. You'll put it together sooner or later. Jetted right? floats set? time on the motor since rebuilt? Where did you ride pinned in 5th the highway? You can loosen carbon, no tellin', but don't think your bike can't run pinned. More info for me and the other guys will get better responses from better mechanics too.

kx250-818:
hey guys yup i was riding back to camp on the highway. Couple of my friends got lazy and didnt want to take the trail back so they took the highway and me being a new rider i didnt want to get lost so i followed. The noise doesnt change with load or with the clutch ingadged. Im almost sure its coming from the motor. I dont know when the last rebuild was they place i bought it from never told me. However this noise was not there until i took that highway ride, and its almost like u can feel the knock when u tuch the motor while its running. 

CR480R:
My engine makes a knock/rattle sound.. I have a fresh top-end, a brand new rod, crank bearings, etc.... It has done it since i put it together... my buddies low-hour KTM 380 makes a very similar noise...

I think the noise might be caused by the powervalve system... I have rode mine alot and it hasnt gotten any worse. I noticed when I put mine together that the center exhaust valve was pretty loose in its bore.. just an idea..

Wizzy214:
ugh ugh i think this guy might have a big issue did you hear his bike? im sure the 380 makes alot of racket.  i think im now dumber just reading your reply.



--- Quote from: CR480R on November 05, 2008, 07:42:34 PM ---My engine makes a knock/rattle sound.. I have a fresh top-end, a brand new rod, crank bearings, etc.... It has done it since i put it together... my buddies low-hour KTM 380 makes a very similar noise...

I think the noise might be caused by the powervalve system... I have rode mine alot and it hasnt gotten any worse. I noticed when I put mine together that the center exhaust valve was pretty loose in its bore.. just an idea..

--- End quote ---

CR480R:

--- Quote from: Wizzy214 on November 06, 2008, 01:57:40 PM ---ugh ugh i think this guy might have a big issue did you hear his bike? im sure the 380 makes alot of racket.  i think im now dumber just reading your reply.
--- End quote ---

Well sorry wizzy. I obviously overlooked this:

--- Quote from: kx250-818 on November 05, 2008, 06:36:32 PM --- However this noise was not there until i took that highway ride, and its almost like u can feel the knock when u tuch the motor while its running. 

--- End quote ---

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