Guide: To find the needle jet you need go click here, choose your carb style, click parts / accessories, then parts to the exploded view drawing. Find the needle jet number style in the chart and click it. Then you will be at your needle jet category.

Function: The needle jet is the main fuel passage to the main bore (venturi) of the carburetor. Depending on the inside diameter of a specific needle jet, this will also effect the function of the needle. therefore, needle jets and jet needles act togeher as the main system in controlling the amount and mixture of the fuel which is drawn in mid-range (1/4 - 3/4) throttle operation.

Needle jets are available not only in types, but by series and size. Mikuni series numbers for style of the needle jet. This series includes not only the physical fitment dimensions but also the nozzle profile, and the atomization pattern. The sizes (inside diameter size) within each series are listed according to a letter-number combination. The letter shows the inside diameter size in increments of .50mm. See the Mikuni Needle Jet Sizing Chart below for a better understanding.

"> Mikuni Needle Jets
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Top > Carb Kits and Parts and Carburetors > Carburetors & Parts by Carburetor Manufacturer > Mikuni > Mikuni Jetting Components > Mikuni Needle Jets

Mikuni Needle Jets

Guide: To find the needle jet you need go click here, choose your carb style, click parts / accessories, then parts to the exploded view drawing. Find the needle jet number style in the chart and click it. Then you will be at your needle jet category.

Function: The needle jet is the main fuel passage to the main bore (venturi) of the carburetor. Depending on the inside diameter of a specific needle jet, this will also effect the function of the needle. therefore, needle jets and jet needles act togeher as the main system in controlling the amount and mixture of the fuel which is drawn in mid-range (1/4 - 3/4) throttle operation.

Needle jets are available not only in types, but by series and size. Mikuni series numbers for style of the needle jet. This series includes not only the physical fitment dimensions but also the nozzle profile, and the atomization pattern. The sizes (inside diameter size) within each series are listed according to a letter-number combination. The letter shows the inside diameter size in increments of .50mm. See the Mikuni Needle Jet Sizing Chart below for a better understanding.

Mikuni Needle Jet Sizing Chart
Mikuni Needle Jet 159
Mikuni Needle Jet 166/480
Mikuni Needle Jet 169/172
Mikuni Needle Jet 171
Mikuni Needle Jet 175
Mikuni Needle Jet 176/270
Mikuni Needle Jet 182
Mikuni Needle Jet 183
Mikuni Needle Jet 188
Mikuni Needle Jet 192
Mikuni Needle Jet 193
Mikuni Needle Jet 196
Mikuni Needle Jet 205
Mikuni Needle Jet 211
Mikuni 224 Needle Jet Mikuni Needle Jet 224
Mikuni Needle Jet 247
Mikuni Needle Jet 258
Mikuni Needle Jet 261
Mikuni Needle Jet 332
Mikuni Needle Jet 389
Mikuni Needle Jet 454
Mikuni Needle Jet 499
Mikuni Needle Jet 568
Mikuni Needle Jet 633 TMXX
Mikuni Needle Jet 640
Mikuni Needle Jet 723 HSR
  Mikuni Needle Jet Press In (Non Removable)

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