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1/16/2018
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absdr
1/16/2018 9:53am
1/16/2018 9:53am
Edited Date/Time
1/19/2018 8:46am
Hi,
last time i rode my 2014 ktm 250sx it revs over max without throttle. This first happens in the Air on a big jump.
The bike revs higher than full throttle and the kill switch wont work. After that i checked everything, carb, throttle cable, fuel hose, connections between cylinder and carb.
Everything looks perfect. I testet the bike on the stand more than five mins. Everything perfect.
Then i ride again and after 200 meters, one second after landing a small jump it happens again. Instant rev to the moon, faster as a full throttle rev, really instant... (my first backflip on a bike after 12 years riding^^).
At home i checked everything again, everything perfect. And i cant repeat this self rev....
I read much about air leaks, but if there is an air leak, why it revs not all the time like this? And with an air leak the rev normally goes high without power i think. But my bike has max power while it revs itself this two times...
Hope you can help me to find the issue. Scary to ride this bike again without finding the reason. Dont want a second hospital visit because my bike is silly....
Sorry for my bad english, greedings from Germany ;P
last time i rode my 2014 ktm 250sx it revs over max without throttle. This first happens in the Air on a big jump.
The bike revs higher than full throttle and the kill switch wont work. After that i checked everything, carb, throttle cable, fuel hose, connections between cylinder and carb.
Everything looks perfect. I testet the bike on the stand more than five mins. Everything perfect.
Then i ride again and after 200 meters, one second after landing a small jump it happens again. Instant rev to the moon, faster as a full throttle rev, really instant... (my first backflip on a bike after 12 years riding^^).
At home i checked everything again, everything perfect. And i cant repeat this self rev....
I read much about air leaks, but if there is an air leak, why it revs not all the time like this? And with an air leak the rev normally goes high without power i think. But my bike has max power while it revs itself this two times...
Hope you can help me to find the issue. Scary to ride this bike again without finding the reason. Dont want a second hospital visit because my bike is silly....
Sorry for my bad english, greedings from Germany ;P
Paw Paw
Iam 99% sure its not the throttle cable or housing, Looked there while the bile revs high first time and everything was ok. But i will check it again.
I will check float height and for air leaks tomorrow, can you explain me why an air leak should be inconstat like the failure on my bike? And why my bike got full horsepower if its a lean condition because an air leak?
The Shop
You should be able to feel a tiny bit of wiggle left/right with your throttle tube so you know it isn't binding on the bar end.
Is there anything else i can check? Or do you think iam safe with new seals? Or better a complete new carb(but everything in there is fine...)
Scary to ride without finding the reason...
i replaced the power valve seals, and the O-rings on the boost port power valve. Also recommend using gasket seal on the left side powervalve cover gasket.
Ask the resident KTM/Husky expert, his name is Tamir. He will thank you.
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