Why do dirt bikes fishtail?/exhaust problem?

  • Thread starter Thread starter thomx
  • Start date Start date
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thomx

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I have a 2000 YZ 125. Every time i get it to the higher RPM in 4th gear on straight aways it begins to fish tail. I am wondering why it happens and if there is anything i can do to prevent it.
I also am having oil drip out of the exhaust pipe. I just jetted the bike which it needed and i thought was the problem but it didn't fix it. i am running a 32:1 gas/oil ratio. i have tried everything i can think of to fix it. please help
 
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