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How to jet a 2004 Honda CRF450R carb.

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Hello i am new to the forum and i have heard many differnt methods of jetting a carburetor and i want to hear some of your methods. Thanks you. Looking forward to a reply.

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The stock jetting is fine with the stock pipe at 0' - 4000'.

If you change the pipe, or go to higher elevation, or a really wet climate, you change the jetting.

There is no reason to change jetting if it is running correctly.

There are no 'methods': either the fuel/air mixture is as close to 13:1 as possible, or it isn't ,and you change the jets that match the part of  the throttle position that is off ratio. That's it.

The easiest way is to copy someone elses jetting with similar modifications and environment; hence the jetting thread.

 

Now, if you are talking about tuning the accelerator pump,  there are lots of things you can do to make it work better.

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