Service manual

MERCARB 2 BARREL CARBURETOR SERVICE MANUAL NUMBER 26

Page 5B-26 90-861329--1 MARCH 1999

c. Fuel and Air Passages: Passages must be perfectly clean for proper carburetor

operation.

d. Accelerator Pump Plunger and Return Spring: Inspect pump plunger cup, pump

plunger spring (on pump assembly) and return spring.

e. Power Piston Spring: Check power piston spring for weakness or distortion.

f. Idle Mixture Needle: Inspect idle mixture needle. If damaged, needle must be

replaced.

g. Levers and Linkages: Check levers, links and rods for wear.

h. Throttle Valve and Shaft: Check throttle shaft for excessive looseness in throttle

body. Check throttle valve and shaft for binding through entire operating range,

making sure valve opens and closes completely. Throttle body assembly must be

replaced if throttle valve and shaft are worn or damaged.

i. Choke Valve and Shaft and Lever Assembly: Check shaft and lever assembly for

excessive looseness in air horn assembly. Check choke valve and shaft and lever

assembly for binding through entire operating range, making sure valve opens and

closes completely. Air horn assembly must be replaced if choke valve and shaft and

lever assembly are worn or damaged.

j. Inspect Casting for visible damage. Inspect gasket surfaces. Inspect accelerator

pump plunger well for scoring or deposits.

Reassembly

IMPORTANT: DO NOT force idle mixture needle against seat as damage to needle

and/or seat will result.

FLOAT BOWL ASSEMBLY

IMPORTANT: Place float bowl and throttle assemblies in holding fixture to prevent

throttle valves from being damaged.

1. Install check ball, spring, and retainer in passage as shown. Push retainer firmly into

slots.

72408

a-Check Ball

b-Spring

c-Retainer

INDEX