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Everything Dirt Bike
Make / Model Specific
Yamaha
She is waking up from a long nap.
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<blockquote data-quote="Nighthawk016" data-source="post: 117236" data-attributes="member: 334"><p>As you go higher, the air pressure decreases so the air particles are farther apart, so the is less air for the engine to suck in. So, with less air you need less gas, which means the higher you are, the leaner your jetting has to be set, but if you base on the 1k ft you need to go just ever so slightly richer because we are roughly 3/4's of the way there. So lets say it's optimal conditions as it is in the jetting charts given to you, and we will say its 50 degrees. Pilot jet at 0ft should be 40.9, at 1000ft 40.5, and if you have a 40, and a 41 available(not how it's gonna work btw) you never wanna go lean, always go slightly on the rich side, so you would pick the 41. what will probably happen is you will have the 40 and a 42.5 available to you, in which case get both and you just tune it to find the best setting for the condition.</p></blockquote><p></p>
[QUOTE="Nighthawk016, post: 117236, member: 334"] As you go higher, the air pressure decreases so the air particles are farther apart, so the is less air for the engine to suck in. So, with less air you need less gas, which means the higher you are, the leaner your jetting has to be set, but if you base on the 1k ft you need to go just ever so slightly richer because we are roughly 3/4's of the way there. So lets say it's optimal conditions as it is in the jetting charts given to you, and we will say its 50 degrees. Pilot jet at 0ft should be 40.9, at 1000ft 40.5, and if you have a 40, and a 41 available(not how it's gonna work btw) you never wanna go lean, always go slightly on the rich side, so you would pick the 41. what will probably happen is you will have the 40 and a 42.5 available to you, in which case get both and you just tune it to find the best setting for the condition. [/QUOTE]
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Everything Dirt Bike
Make / Model Specific
Yamaha
She is waking up from a long nap.
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