Chrysler 4 HP Outboard Motor Service Manual OB 2278, Page 16Get this manual
SECTION (Con't BTurn idle adjustment screw counterclockwise until thread portion of screw is out of carburetorPull screw and spring out
CExamine screw for deep grooves on tapered portion of pointIf deep grooves are present, the screw must be replaced
4-2Installing Idle Adjustment Screw
APlace spring on adjustment screwThread screw and spring in carburetor until needle seats in boreDO NOT FORCE ADJUSTMENT SCREW OR TAPERED PORTION OF NEEDLE will be damagedBBack screw out one full turn counterclockwise
Figure 7Removing Choke Shutter
3-2Installing Choke Shutter and Shaft
ASlide choke shaft in carburetor with flat side of shaft facing toward front of carburetorBPlace choke shutter on shaft as shown in figure and secure shutter with two screws