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Jetting for exhaust?

Joined
Jul 4, 2007
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#1
i just bought a pro circuit works pipe and 304 factory silencer for my yz 125 and does the bike have to be jetted for the exhaust or can you leave it alone? help is much appreciated! :ride:
 
Joined
Jul 4, 2007
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#2
you have to re jet. go on pro circuits web sight and they will tell you what jets to run for your bike.
 
Joined
Apr 18, 2006
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#5
yz125rider77 said:
on the website what does "pos" mean and is there different size fuel mixture screws?

Depending on the context, "pos" could mean "positive" or it could mean "piece of .....".

As for fuel mixture, the idle circuit is usually adjusted with a screw. The metering needle, which adjusts the mixture a bit between low and mid range, is adjusted by moving the needle position up and down by changing the "clip" position. The main jet is usually buried in the carb and is adjusted by removing it and replacing with a different one.

Rod
 
Joined
Sep 15, 2005
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#6
I think Pos. stands for position of the circlip on the needle jet. I think?