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This is the O.S. Engines 91HZ-R conversion set.
Features: Converts the O.S. 91HZ or 91HZ-PS into the 91HZ-R equipped with the fuel tank pressurized regulator system
Includes: 61E-R Carburetor with Regulator, Cover Plate, Pressure Nipple #1, Cover Gasket, Check Valve and Instruction Sheet
Initial Needle Positions
Main Needle: Open 2-1/2 turns from fully closed
Medium Speed Needle: 1 turn open from fully closed
Note: Close needles gradually-if mixture is lean, open the main needle further 90 degrees
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