pilot jet question

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wotmode

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Jan 8, 2008
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50
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Minnesota
are pilot jets numbered backwards compared to main jets? I'm setting my sx up for out west. I was rejetting tonight and pulled 45 pilot out, and I have 60's to put in. My home altitude is 1000ft. Last year it ran awesome at 8-10,000ft, but I wonder if I didn't switch my pilots back when I got home.
 
Generally speaking when you go up in altitude you need to go up on the pilots and down on the mains and needles. Don't remember off hand why this is, but it is what it is.
 
Ryan B said:
Generally speaking when you go up in altitude you need to go up on the pilots and down on the mains and needles. Don't remember off hand why this is, but it is what it is.
Click to expand...

this is because pilots work off of atmospheric pressure...the higher you go the less pressure (and suction) you have therefore you need more fuel present. the opposite is true for the mains....less air available, same fuel= rich condition therefore you need to reduce main jet for elevation.
 
That's right:)

bolin22 said:
this is because pilots work off of atmospheric pressure...the higher you go the less pressure (and suction) you have therefore you need more fuel present. the opposite is true for the mains....less air available, same fuel= rich condition therefore you need to reduce main jet for elevation.
Click to expand...

That's it exactly. I remembered the mains, but couldn't remember why the pilots did what ehy did other than that's how it is. Thanks for clearing it up for me.
 
thanks guys. It ran out perfect last year,so I'm going with the same set up. Now I'm not worried I forgot something over the summer.
 
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