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Old 07-27-2013, 11:05 AM
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Default Bought a FMF fatty, can I run stock jets?

     

I have a 03 yz125. Do I have to buy other jets or jet it with the jets I got now?
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Old 07-27-2013, 11:37 AM
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Optimum jetting requirements change when a pipe of different dimensions is used. Pretty accurate rule of thumb.
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Old 07-28-2013, 07:29 PM
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Can I use it with the jets that are already in my carb? *Stock
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Old 07-28-2013, 09:23 PM
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Depends...is it running right with the pipe on it ( doubtful ).
Once your double checked your float height I would dona series of chop tests to see if the jetting is on the money....
Chances are you might be lean....causing other issues...
You'll know if the jetting ( or more than likely the floats are out ) is too rich if your fouling plugs but that is a VERY generalised take on it.
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Old 07-29-2013, 11:53 AM
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Don't know much about jetting, but with the stock pipe it runs great. My friend said it all depends if it needs it. I might have someone jet it to perfection
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Old 07-29-2013, 12:29 PM
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Just put the pipe on and ride it. If it runs good for you, don't mess with it. If you notice areas that don't seem to be right, look into doing what it takes to tune those areas.
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