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Crf450 jetting


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Four strokes are not suseptable to elevation changes like two strokes.

You can pretty much use four stroke jetting, if correct to begin with, over 8kft range no problem.

 

The service manual for my RM-Z250 states the following, "the oxygen concentration varies by as much as 20% depending on the temperature and altitude under normal riding conditions." To say that 4 stroke jetting at 0 ft above sea level is the same as 8k feet above sea level is simply not true. You may be able use the same jetting and still achieve 80-90% power, but you will need to re-jet if you want that extra 10-20%. 

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The service manual for my RM-Z250 states the following, "the oxygen concentration varies by as much as 20% depending on the temperature and altitude under normal riding conditions." To say that 4 stroke jetting at 0 ft above sea level is the same as 8k feet above sea level is simply not true. You may be able use the same jetting and still achieve 80-90% power, but you will need to re-jet if you want that extra 10-20%. 

 

 Yup

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