zr7cat
New member
My buddy just bought a 99 sx vmax 700 with PSI triple pipes on it, sled is in really good shape with with 4200 miles on it. First thing he did was pull the carbs to clean them, they were nasty! Check the main jets and the were 128, seems kind of a low main for having pipes on it, any thoughts?
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You should be running 142.5 s across the board. for running here in Michigan! with those pipes!
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Hammer Down
Member
He may have bumped the pilots up or needles to compensate.
SWEDE
New member
Doesn't sound right, pipes usually require in the range of 147.5-150 main jets
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A couple of bucks
VIP Member
PSIs use stock or slightly lower mains.
SWEDE
New member
No fooling
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Yes with them pipes they went down to 142ish with mains. I dont have my notes infront of me . When them pipes are right they hall. Just ask yamigod
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I loved my SX with the PSI pipes---I would have to dig out my paper work to see what I was running for jets---I know it was what PSI recommended-- my redhead was spinning at 9200 RPM's for many years--sounded great....Tod
A couple of bucks
VIP Member
When we put the PSIs on my sons redhead, I believe we just dropped the needles to ??? to get good plug color.
zr7cat
New member
Ok thanks for the info guys.
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with the stock pilots you need to be at 3 turns out on the fuel screws, needles set at the 3rd pos on pto and 4th pos on the other two, mains should be 142.5 across the board!
zr7cat
New member
Nice, thanks.
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JohnnyG383
Member
Here is a link to all your sleds specs http://www.totallyamaha.com/snowmobiles/AAATuning%20Chart/Specs.htm