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Jet Correction Chart ...... Example: 160 Stock Jet x 0.89= 142 Main Jet

Altitude - Meters 0m 500m 1000 1500 2000 2500 3000 3500 4000
Altitude - Feet 0' 1500' 3000' 4500' 6000' 7500' 9000' 10500' 12000'
Temperature  
-22F [30C] 1.04 1.03 1.01 1.00 0.98 0.97 0.95 0.94 0.93
-4F  [20C] 1.03 1.02 1.00 0.99 0.97 0.96 0.95 0.93 0.92
14F   [10C] 1.02 1.01 0.99 0.98 0.96 0.95 0.94 0.92 0.91
32F   [0C] 1.01 1.00 0.98 0.97 0.95 0.94 0.93 0.91 0.90
50F   [10C] 1.00 0.99 0.97 0.96 0.95 0.93 0.91 0.90 0.88
59F   [15C] 1.00 0.99 0.97 0.96 0.94 0.93 0.92 0.90 0.88
68F  [20C] 1.00 0.98 0.97 0.95 0.94 0.93 0.91 0.90 0.88
86F  [30C] 0.99 0.97 0.96 0.94 0.93 0.92 0.90 0.89 0.88
104F  [40C] 0.98 0.96 0.95 0.94 0.92 0.91 0.90 0.88 0.87
123F  [50C] 0.97 0.96 0.94 0.93 0.92 0.90 0.89 0.88 0.86

  1. Locate temperature and elevation on chart above

  2. To get correct main jet and idle jet size, multiply the STOCK jet by the correction factor.

Needle position

Correction Factor

Jet Needle Position
.90 and below Lower needle 2 clip positions from stock setting
.91 to .95 Lower needle 1 clip position
1.03 and above Raise needle 1 clip position

 

 

 

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