Lab #3 - Carburetor

Disassembly & Assembly

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Model 130G32 Horizontal OHV

Required Tools

• 10 mm socket or wrench
• Ratchet wrench
• Standard screwdriver
• Phillips screwdriver
• Needle Nose Pliers
• Pliers

Systematic Approach

• This is a step-by-step disassembly and reassembly process
• Take your time when disassembling the engine and listen for direction from the instructor
• Lay assemblies in order as they were removed
• Keep fasteners with removed assemblies or thread them loosely back in bolt holes
• It is not a race
• Do not work ahead!

3

Let’s Begin

• Close fuel shut-off valve
• Disconnect spark plug ignition lead from spark plug
• Move throttle to stop position

Remove Carburetor �Per Lab #2 Instructions

• Use written instructions

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6

Carburetor Disassembly

• Set up a clean environment before starting disassembly
• A tray or large plate will help prevent losing small parts
• Keep double barrel carburetor left and right components separate

Remove Float Bowl

• Use 10mm tool
• Observe float and inlet needle movement
• Inlet needle is spring loaded

7

Remove Float and Needle Valve

• Use pliers to remove hinge pin
• Examine slot in float for inlet needle and orientation of spring
• Examine seat in carburetor body

8

Remove Idle Stop Screw

Count and record the number of turns required to remove

9

Remove Pilot Jet

Gently pry up with screwdriver or pull out with pliers

10

Remove Main Jet & Emulsion Tube

Unscrew jet with narrow, flat-blade screwdriver

11

Reassembly

• This is a step-by-step reassembly process
• It is not a race
• Take your time when assembling the engine and listen for direction from the instructor
• Do not work ahead!
• Just “snug” Fasteners to prevent thread damage
• Special procedures will be explained

12

Install Main Jet & Emulsion Tube

• Slide emulsion tube into carburetor body
• Screw jet tight to emulsion tube
• Use a narrow screwdriver to prevent thread damage to carburetor body

13

Install Pilot Jet

• Note orientation of flat sections
• Press jet by hand until it seats

14

Install Idle Stop Screw

• Screw in the same number of turns it took to remove
• This should set the idle speed close to where it was originally

15

Install Float and Needle Valve

Float should be level with gasket surface when held with the float up

16

Attach Float Bowl �

• Verify bowl gasket is properly installed
• Assemble bowl to carburetor
• Install bowl nut with 10mm tool
• Torque to 50 lbs in.

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17

Install Carburetor �Per Lab #2 Instructions

• Use written instructions

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Success!

• Do you have any extra parts?

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• Do you have any questions?

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