Ktm Carburetor
Ktm Carburetor
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My 2003 ktm 125 sx cuts off power when it should be reaching the powerband?
My friend rides with me all the time and he lives across town so he leaves his own yz 125 at my house, so i know the difference between the two bikes. My ktm bogs whenever it should be hitting powerband, but my friends yz hits powerband just fine. My dad and i replaced the spark plug, cleaned the air filter and really oiled it up, and cleaned the carburetor. It runs good in the low end of a gear but when you hit the mid-high end of the gear it will make a weird sound and not go any faster then before. I bought it for 1250 a month ago and it has been doing this since i got it.
The answer to your question is "it will make a weird sound". I will bet the sound is coming from the top end of the engine. This could be several things, but combined with the power loss, it sounds like a bent valve or worn valve spring.
Do a compression test of the cylinder. I will bet that it will make compression and then it will leak out fast. If a valve is bad you will hear the compressed air leak out of the valve that is bad.
The weird sound is the valve not lining up. It can also be a worn valve spring. The rocker arm is slapping the valve or the rocker arm is floating on the cam.
You are probably going to need a top end rebuild.