Wacker Neuson WM 80

Questions and Answers:

J
Jordan GarciaAug 13, 2025
What to do if my Wacker Neuson WM 80 floods?
- J
  Joshua Hall MDAug 13, 2025
  If your Wacker Neuson Engine floods, it could be due to several reasons. A worn inlet needle body or tip might be the cause, in which case you should replace the inlet needle. Alternatively, the inlet needle might be sticking, requiring you to check the spring tension and metering lever. It could also be that dirt or gum formations are preventing the inlet needle from sealing, so you should remove and clean the carburetor. Another possible cause is an incorrectly set metering lever, which needs adjustment. Finally, ensure the diaphragm is correctly installed.
P
psmithAug 17, 2025
Why my Wacker Neuson WM 80 Engine will not accelerate?
- C
  christopheralvarezAug 17, 2025
  If your Wacker Neuson Engine won't accelerate, several factors could be the cause. The metering lever might be set too low, requiring adjustment. Alternatively, the metering lever could be binding, in which case you should clean it. Loose mounting bolts could also be the issue, so ensure they are tightened. A plugged main nozzle can prevent acceleration, so consider replacing it. Finally, a plugged fuel hose could be the culprit, so replace the fuel hose.
T
Theresa SnyderAug 21, 2025
What to do if my Wacker Neuson WM 80 Engine will not idle?
- R
  Ray GravesAug 21, 2025
  If your Wacker Neuson Engine won't idle, there are several potential causes. First, the idle speed might be incorrectly adjusted, so try resetting it. Second, the throttle might not be fully returning to idle; in this case, adjust the throttle cable and inspect the throttle shaft for any sticking. Third, the throttle plate could be cocked in the bore, causing a fast idle, so reposition the throttle plate. Fourth, the idle discharge ports could be plugged, requiring you to clean the carburetor or blow it out with compressed air. Fifth, defective manifold gaskets could be the issue, so replace them. Finally, the inlet needle might not be seating properly, so clean and/or replace it.
M
matthewsmatthewAug 25, 2025
Why does my Wacker Neuson WM 80 Engine run rich?
- R
  Robin ChenAug 25, 2025
  If your Wacker Neuson Engine runs rich, it could be due to a defective pump diaphragm, which would need to be replaced. Another possibility is that the metering lever is set too high, requiring adjustment. The metering lever could also be stuck, so try cleaning the carburetor. Lastly, a worn inlet needle body or tip could be the culprit, so replace the inlet needle.
M
Makayla BradyAug 28, 2025
How to fix a Wacker Neuson WM 80 Engine that floods?
- M
  Michael PooleAug 28, 2025
  If the Wacker Neuson Engine floods, it might be due to a defective or missing fuel filter, allowing dirt to enter the carburetor; install a new fuel filter. Another cause could be a sticking inlet needle; check the spring tension and axle point. Dirt or gum formations preventing the inlet needle from sealing could also be the problem; remove and clean the carburetor. The inlet control lever setting could be off; adjust the inlet control lever. A control lever spring not seated on the lever might be the issue; remove and either replace or reinstall the control lever. Finally, an incorrectly installed diaphragm could be the cause; correct the diaphragm installation.
M
Marissa WebsterSep 1, 2025
What to do if my Wacker Neuson WM 80 does not accelerate?
- Z
  zstrongSep 1, 2025
  If your Wacker Neuson Engine is not accelerating, the idle mixture might be too lean, so adjust the idle mixture. Another cause could be a loose diaphragm cover plate causing an air leak; check and tighten the cover plate. Also, the inlet control lever might be set incorrectly; correct the lever adjustment. A plugged main fuel discharge nozzle could be the problem; clean the carburetor or blow it out with compressed air. Finally, a punctured control diaphragm could be the cause; replace the diaphragm.
J
jgrossSep 4, 2025
Why my Wacker Neuson WM 80 Engine does not idle?
- M
  Mrs. Katherine AllenSep 5, 2025
  If your Wacker Neuson Engine is not idling, the idle speed might be incorrectly adjusted; reset the idle speed. Also, the throttle might not be fully returning to idle; adjust the throttle cable and inspect the throttle shaft for sticking. Another possibility is that the throttle plate is cocked in the bore, causing fast idle; reposition the throttle plate. Plugged idle discharge ports could also be the cause; clean the carburetor or blow it out with compressed air. An incorrectly set inlet control lever might be the issue; readjust the inlet control lever. Finally, the inlet needle might not be seating; clean and/or replace the inlet needle.
K
Kimberly ShepardSep 8, 2025
What causes a Wacker Neuson WM 80 to run rich?
- E
  Erin HarrellSep 9, 2025
  If your Wacker Neuson Engine runs rich, the high-speed adjustment might be incorrect, so readjust the high speed. Another cause could be a damaged high-speed mixture needle valve, in which case you should replace it. The size of the fixed jet might also be incorrect, so replace the fixed jet with the correct size. Lastly, a leaking plug covering the main discharge port could be the issue; install a new plug.

Wacker Neuson WM 80 Specifications

General

Brand	Wacker Neuson
Model	WM 80
Category	Engine
Language	English

Summary

Foreword

Machine Documentation

Information on manuals, ordering parts, and required information for service.

Expectations for Information in this Manual

Manual covers repair procedures and Wacker Neuson reserves rights to modify.

CALIFORNIA Proposition 65 Warning

Warning about chemicals in engine exhaust and components causing cancer/birth defects.

Laws Pertaining to Spark Arresters

Information on spark arrester requirements for internal combustion engines.

Manufacturers Approval

Definitions of approved/unapproved parts, attachments, and modifications.

Safety Information

Signal Words Used in this Manual

Explanation of DANGER, WARNING, CAUTION, NOTICE, and NOTE signal words.

Safety Guidelines for Operating the Machine

Operator qualifications, training, PPE, and general safety rules for machine operation.

Operator Safety while Using Internal Combustion Engines

Hazards and safety practices for operating engines, including refueling.

Service Safety

Safety precautions to be followed during machine maintenance and repair.

Technical Data

Engine Specifications

Key specifications for the WM 80 engine, including type, displacement, and speeds.

Tune-up Specifications

Specifications for engine tune-up, including ring gap, bore taper, and spark plug gap.

Carburetor Specifications for Bing, and Tillotson (Standard**)

Jet sizes and adapter bore diameters for various carburetor models.

Operating and Idle Speeds

Recommended operating and idle speeds for different machine models.

Maintenance

Periodic Maintenance Schedule

Schedule detailing routine maintenance tasks based on operating hours.

Storage

Procedures for storing the unit for long periods (more than 30 days).

General Air Filter Maintenance

General inspection and maintenance procedures for the air filter system.

Cartridge-Type Air Filter

Service instructions for the cartridge-type air filter.

Disc-Type Air Filter

Service instructions for the disc-type air filter with oil-wetted foam.

Low-Maintenance Air Filter

Cleaning and maintenance procedures for the low-maintenance air filter.

Dual-Element Air Cleaner

Cleaning and maintenance for the dual-element air cleaner system.

Three-Stage Air Cleaners

Cleaning and maintenance for three-stage air cleaner systems.

Engine Cleaning

Instructions for cleaning engine cooling fins to prevent overheating.

Spark Plug

Maintenance, inspection, and gapping procedures for the spark plug.

Muffler

Procedure for servicing the engine muffler to remove carbon deposits.

Fuel Filter

Information on fuel filter types, maintenance, and replacement.

Fuel Hoses

Checking the condition and clamping of fuel hoses.

Starting and Ignition

Starter Assembly Exploded View

Diagram showing components of the starter assembly.

Disassembling the Starter

Step-by-step procedure for disassembling the starter.

Inspecting the Starter

Inspection procedures for starter components like springs, pulleys, and ratchets.

Assembling the Starter

Step-by-step procedure for assembling the starter components.

Replacing the Starter Rope

Procedure for replacing the starter rope.

Ignition System Diagram

Schematic diagram illustrating the ignition system.

Ignition System Operation

Explanation of how older and newer ignition systems operate.

Checking Spark

Procedure and safety precautions for checking for spark.

Using Ignition Tester

Using a specialized tester for accurate ignition module diagnostics.

Setting Air Gap

Procedure for manually setting the ignition module air gap.

Replacing the Ignition Module

Step-by-step guide for removing and replacing the ignition module.

Carburetor Basics

Brands Used

Overview of Walbro, Tillotson, and Bing carburetors used on the WM 80 engine.

Walbro Carburetor Operation

Explanation of the Walbro carburetor's fuel pump and fuel metering systems.

Tillotson Carburetor Operation

Explanation of the Tillotson carburetor's fuel pump and inlet needle valve operation.

Bing Carburetor Operation

Explanation of the Bing carburetor's fuel feed and inlet needle valve operation.

Carburetor Adapters

Carburetor Adapter Types

Description of various carburetor adapters and their applications for the WM 80 engine.

Carburetor Replacement

Replacing the Walbro Carburetor (auto-release choke models)

Step-by-step procedure for removing and replacing Walbro carburetors.

Removing Walbro Carburetor (standard choke models)

Procedure for removing Walbro carburetors with standard choke models.

Removal, Tillotson with composite adapter

Procedure to remove Tillotson carburetors with composite adapters.

Tillotson with Straight-Through Adapters

Procedure for removing Tillotson carburetors with straight-through adapters.

Tillotson with Elbow Adapters

Procedure for removing Tillotson carburetors with elbow adapters.

Bing

Procedure for removing Bing carburetors.

Carburetor Overhaul

Walbro Carburetor Exploded View (auto-release choke models)

Exploded diagram of Walbro carburetor components.

Walbro Carburetor Components (auto-release choke models)

List of components for auto-release choke Walbro carburetors.

Rebuilding the Walbro Carburetor (auto-release choke models)

Disassembly and reassembly steps for Walbro carburetors.

Walbro Carburetor Exploded View (standard choke models)

Exploded diagram of standard choke Walbro carburetor components.

Walbro Carburetor Components (standard choke models)

List of components for standard choke Walbro carburetors.

Rebuilding the Walbro Carburetor (standard choke models)

Disassembly and reassembly steps for standard choke Walbro carburetors.

Tillotson Carburetor Exploded View

Exploded diagram of Tillotson carburetor components.

Tillotson Components

List of components for Tillotson carburetors.

Bing Carburetor Exploded View

Exploded diagram of Bing carburetor components.

Bing Carburetor Components

List of components for Bing carburetors.

Carburetor Inspection and Adjustment

Inspection

Inspection of carburetor diaphragms, needle valves, and springs.

Adjusting the Inlet Control Lever

Procedures for adjusting inlet control levers on Walbro, Tillotson, and Bing carburetors.

Carburetor Adjustments

Adjustment procedures for Walbro, Tillotson, and Bing carburetors.

Carburetor Troubleshooting

Troubleshooting Walbro Carburetors

Common problems and remedies for Walbro carburetors.

Troubleshooting Tillotson and Bing Carburetors

Common problems and remedies for Tillotson and Bing carburetors.

Disassembly and Assembly

Tools

General advice on tool selection for repairs.

Special Tools

List of special tools required for disassembly and assembly.

Ordering Parts

Information on ordering replacement parts from Wacker Neuson.

Reference Numbers ( )

Explanation of reference numbers used in assembly drawings.

Threadlocking Compounds

Guidance on using threadlocking compounds to prevent loosening.

Removing the WM 80 Engine from BS Rammers (auto-release choke models)

Procedure to remove the WM 80 engine from BS Rammers.

Removing Engine From BS Model Rammers (standard choke models)

Procedure to remove the engine from BS Rammers (standard choke).

Removing Engine From BH 23 Breakers

Procedure to remove the engine from BH 23 Breakers.

Removing Clutch

Procedure for removing the clutch assembly from the engine.

WM 80 Exploded View

Exploded diagram of WM 80 engine components.

WM 80 Components

List of WM 80 engine components with reference numbers.

WM 80 Cross Section

Cross-section diagram of the WM 80 engine.

WM 80 Cross Section Components

List of components shown in the WM 80 cross-section diagram.

Vacuum Testing Cylinder

Procedure for performing a vacuum test on the engine cylinder.

Cylinder and Piston Removal

Steps for removing the cylinder and piston assembly.

Cylinder and Piston Inspection

Inspection of piston rings, piston, and cylinder for wear.

Cylinder and Piston Installation

Steps for installing the cylinder and piston assembly.

Inspecting Connecting Rod and Crankshaft

Inspection of the connecting rod and crankshaft for wear and play.

Disassembling Crankcase

Procedure for disassembling the engine crankcase.

Assembling Crankcase

Steps for assembling the engine crankcase.

Crankshaft Bearings

Procedures for removing crankshaft bearings using press or extractor.

Bearing Installation

Procedure for installing crankshaft bearings using special tools.

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