Carburetor Air/Fuel Adjustments - Spree

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  • Screw in air screw until it lightly seats then turn it
'84-'85 1 7/8th turns out
'86 1 1/2 turns out
'87 1 3/8ths turns out


  • Reset the idle speed with the throttle stop screw
  • Turn the air screw in or out to find the highest idle speed
  • Reset the idle speed with the throttle stop screw. Idle spec is 1800 rpm.
  • Make sure that the engine does not miss or run erratically. If necessary repeat steps 2 through 4


Screw Identification

Note: The screw identified as 'throttle stop screw' in above text is 'idle speed screw' in the diagram

SB50 Carb Screws.jpg

-- Author: Jim, photo - mousewheels

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