knocking noise at low idle??

2 replies to this topic
  • bigwake

Posted August 13, 2007 - 06:33 PM


my 03 yz450 runs great! i love it!! starts 1st kick every time..has all the power..runs strong!..this is my first thumper though..and i just wanted to know if a slight knocking sound is normal when you lower the idle wayy down..i'm pretty sure it's because of the low idle..because it sounds like it is going to shut is it normal?..and higher idle it purrs like a kitty

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  • grayracer513

Posted August 13, 2007 - 06:42 PM


Yes, it's normal. You'll probably fing that most of it goes away when you pull the clutch in. That's because most of the noise is the transmission gears being rattled around by the irregular accel/decel of the single cylinder idle. The rest of it is cam flip and the primary gears.

  • bigwake

Posted August 13, 2007 - 06:46 PM


good..i'll try listening when i pull in the clutch

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