too rich fuel

Joined
Oct 27, 2003
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#1
I bought a 2004 yz 250 and bike runs rich "foul plugs fast", runnning mixture at 32to1..help if any suugestions plz !!!!!!!!!
 

agitt73

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May 11, 2000
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#2
jetting must be wrong im not sure what the jetting is on those bikes
also check gear oil if its getting low with no leaks it could be a crank
seal
 

Zerotact

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Dec 10, 2002
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#4
use what ever it says in the manual 32:1 is common.. I'd say you should look into jetting
 

JohnScott

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May 22, 2001
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#5
Do a search on jetting - the premix ratio is not your problem. A recent thread adressed jetting issues with this bike - or a 2003 - which shouldn't be far off. Filter what you read though, one of the threads was full of crap.

John