Briggs & Stratton 98900

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Summary

Hazardous Conditions and Warnings

Engine Oil Management

Checking and Adding Oil Procedure

Step-by-step instructions for checking and replenishing engine oil.

Fuel System and Handling

Adding Fuel Procedure

Step-by-step instructions for safely refueling the engine.

Starting and Stopping the Engine

Starting the Engine

Step-by-step guide for initiating engine operation.

Stopping the Engine

Instructions on how to safely shut down the engine.

Engine Maintenance Schedule and Procedures

Maintenance Schedule

Recommended maintenance tasks and their intervals.

Changing Oil Procedure

Detailed steps for draining and refilling engine oil.

Engine Adjustments and Settings

Throttle Control Adjustment

Steps to adjust the remote throttle control for proper operation.

Emission Control System Warranty

Emission Control Defects Warranty Statement

Overview of warranty coverage for emission control defects.

Owners Warranty Responsibilities

Warranty Exclusions and Limitations

Normal Wear and Improper Maintenance

Causes for Warranty Exclusion

List of specific reasons and conditions that will void the engine warranty.

Limited Warranty Policy

Limited Warranty Statement

Legal statement defining the scope and limitations of the warranty.

Warranty Period Details

Table outlining warranty coverage duration based on engine type and usage.

Summary

Hazardous Conditions and Warnings

Engine Oil Management

Checking and Adding Oil Procedure

Step-by-step instructions for checking and replenishing engine oil.

Fuel System and Handling

Adding Fuel Procedure

Step-by-step instructions for safely refueling the engine.

Starting and Stopping the Engine

Starting the Engine

Step-by-step guide for initiating engine operation.

Stopping the Engine

Instructions on how to safely shut down the engine.

Engine Maintenance Schedule and Procedures

Maintenance Schedule

Recommended maintenance tasks and their intervals.

Changing Oil Procedure

Detailed steps for draining and refilling engine oil.

Engine Adjustments and Settings

Throttle Control Adjustment

Steps to adjust the remote throttle control for proper operation.

Emission Control System Warranty

Emission Control Defects Warranty Statement

Overview of warranty coverage for emission control defects.

Owners Warranty Responsibilities

Warranty Exclusions and Limitations

Normal Wear and Improper Maintenance

Causes for Warranty Exclusion

List of specific reasons and conditions that will void the engine warranty.

Limited Warranty Policy

Limited Warranty Statement

Legal statement defining the scope and limitations of the warranty.

Warranty Period Details

Table outlining warranty coverage duration based on engine type and usage.

This document is an Operating & Maintenance Instructions manual for Briggs & Stratton engines, specifically covering Model Series 9B900, 9C900, 9D900, 98900, 10A900, 10B900, 10C900, and 10D900. The manual provides essential information for the safe and effective operation, maintenance, and storage of these small engines.

Function Description

The Briggs & Stratton engines covered in this manual are single-cylinder, L-head, air-cooled, low-emissions engines designed to power various outdoor equipment. The manual emphasizes the company's commitment to producing environmentally friendly engines, noting a 70% reduction in smog-forming exhaust emissions since 1995. The engines are certified to operate on gasoline, with an Exhaust Emission Control System designated as EM (Engine Modifications).

Important Technical Specifications

The manual provides detailed technical specifications for two main model series:

MODEL SERIES 90000:
- Bore: 2-9/16 in. (65.09 mm)
- Stroke: 1-3/4 in. (44.45 mm)
- Displacement: 9.02 cu. in. (147.8 cc)
MODEL SERIES 100000:
- Bore: 2-9/16 in. (65.09 mm)
- Stroke: 1-7/8 in. (47.63 mm)
- Displacement: 9.67 cu. in. (158.6 cc)

Tune-Up Specifications:

Armature air gap: 0.006 – 0.010 in. (0.15 – 0.25 mm)
Spark plug gap: 0.030 in. (0.76 mm)
Valve clearance (with valve springs installed and piston 1/4 in. (6 mm) past top dead center, when engine is cold):
- Intake: 0.005 – 0.007 in. (0.13 – 0.18 mm)
- Exhaust: 0.007 – 0.009 in. (0.18 – 0.23 mm)

Oil Capacity: Approximately 5/8 qt (20 ozs; 0.6 liter). Fuel Type: Clean, fresh, regular unleaded gasoline with a minimum of 77 octane. The manual advises against using gasoline containing Methanol and recommends Briggs & Stratton Gasoline Additive (P/N 5041) for engine protection.

Usage Features

The manual outlines various features and procedures for using the engine:

Safety Information: Extensive warnings are provided regarding gasoline flammability and explosiveness, unintentional sparking, rotating parts, hot surfaces, carbon monoxide poisoning, and rapid starter cord retraction (kickback). It explicitly states that Briggs & Stratton does not approve or authorize the use of these engines on 3-wheel All Terrain Vehicles (ATVs), motorbikes, aircraft products, or vehicles intended for competitive events due to potential for serious injury or death.
Starting Procedure (Rewind/Manual Starter):
- Check oil level.
- Move throttle to FAST.
- Firmly push the primer bulb 3-5 times (5 times for first start, 3 times thereafter).
- Close safety brake handle (if equipped).
- Grasp rope handle, pull slowly until resistance is felt, then pull rapidly to start.
- Allow engine to warm up, then operate with throttle in FAST for maximum performance.
Stopping Procedure:
- Move throttle to SLOW.
- Release safety brake control handle (if equipped) or move throttle to STOP.
- CAUTION: Do not stop the engine by moving the choke control to CHOKE, as this can cause backfire, fire, or engine damage.
Throttle Adjustment: Instructions are provided for adjusting the remote throttle control if the engine runs roughly or fails to start, involving loosening and tightening a casing clamp screw and moving the governor control lever and remote throttle.
Carburetor Adjustment: The manual explicitly states that the carburetor on this engine is not adjustable.
Stop Switch Adjustment: Instructions are given to ensure the governor control lever makes good contact with the stop switch and to check throttle operation.

Maintenance Features

The manual provides a detailed maintenance schedule and instructions for various components:

Oil:
- Checking: Check oil level before starting and daily or every eight hours. Keep oil level at FULL.
- Changing: Change oil after the first 5-8 hours of use, then every 50 hours or every season. Change oil every 25 hours under heavy load or high temperatures.
- Type: Use high-quality detergent oil classified "For Service SF, SG, SH, SJ" or higher (e.g., Briggs & Stratton 30W). Synthetic oils meeting ILSAC GF-2, API certification mark, and "SJ/CF ENERGY CONSERVING" are acceptable at all temperatures.
- Procedure: Run engine until it runs out of fuel, disconnect spark plug wire, remove dipstick, drain oil (top, bottom, or side drain options), add new oil (5/8 qt), and replace dipstick.
- CAUTION: Do not overfill, as it can cause smoking, hard starting, spark plug fouling, or oil saturation of the air filter.
Air Cleaner (Oil-Foam®):
- Service Interval: Every 25 hours or every season (more often in dusty conditions).
- Procedure: Remove screw, carefully remove air cleaner, disassemble and clean all parts. Wash the Oil-Foam® element in liquid detergent and water, squeeze dry, saturate in engine oil, and squeeze out excess oil. Reinstall.
Spark Plug:
- Inspection: Inspect every 50 hours or every season.
- Replacement: Replace every 100 hours or every season.
- Testing: Use only Briggs & Stratton Spark Tester (P/N 19368).
Cooling System:
- Cleaning: Clean cooling system every 100 hours or every season. Remove cover and blower housing, clean areas shown in the diagram.
- Importance: Prevents overheating and engine damage, especially after cutting tall, dry grass.
Combustion Chamber: Clean combustion chamber every 100-300 hours (recommended by authorized dealer).
Spark Arrester: Inspect if equipped (every 50 hours or every season). Replace if damaged or plugged.
Cleaning Debris: Daily or before every use, clean grass, chaff, or accumulated debris from the engine, linkage, springs, and controls. Keep the area around and behind the muffler free of combustible debris. CAUTION: Do not use water to clean engine parts to avoid contaminating the fuel system.
Storage: For engines stored over 30 days:
- Fuel System: Run the engine until it stops from lack of fuel (if using oxygenated/reformulated gasoline) OR run until out of fuel or add gasoline additive and run for several minutes to circulate (if using regular gasoline).
- Oil: Change oil while the engine is still warm.
- Cylinder: Remove the spark plug, pour about 1/2 oz. (15 ml) of engine oil into the cylinder, replace the spark plug, and crank slowly to distribute the oil.
- Cleaning: Clean surface debris, chaff, or grass.
- Location: Store in a clean, dry area, away from furnaces, stoves, water heaters, or other appliances with pilot lights or spark-creating devices.

The manual also includes information on the Emission Control System Warranty, covering specific parts for two years from the date of retail purchase, provided there is no abuse, neglect, or improper maintenance. It emphasizes the use of genuine Briggs & Stratton parts for all maintenance and repairs to ensure performance and maintain warranty validity. Contact information for Briggs & Stratton's 24-hour hotline and website is provided for support.