MTD 25cc User Manual

Professional Shop Manual
25cc 2-Cycle P25 Series Engines
NOTE: These materials are for use by trained technicians who are experienced in the service and repair of outdoor power
equipment of the kind described in this publication, and are not intended for use by untrained or inexperienced individuals.
These materials are intended to provide supplemental information to assist the trained technician. Untrained or inexperi-
enced individuals should seek the assistance of an experienced and trained professional. Read, understand, and follow all
instructions and use common sense when working on power equipment. This includes the contents of the product’s Oper-
ators Manual, supplied with the equipment. No liability can be accepted for any inaccuracies or omission in this publication,
although care has been taken to make it as complete and accurate as possible at the time of publication. However, due to
the variety of outdoor power equipment and continuing product changes that occur over time, updates will be made to these
instructions from time to time. Therefore, it may be necessary to obtain the latest materials before servicing or repairing a
product. The company reserves the right to make changes at any time to this publication without prior notice and without
incurring an obligation to make such changes to previously published versions. Instructions, photographs and illustrations
used in this publication are for reference use only and may not depict actual model and component parts.
© Copyright 2010 MTD Products Inc. All Rights Reserved
For Parts Call 606-678-9623 or 606-561-4983
www.mymowerparts.com

MTD 25cc Specifications

General

Brand	MTD
Model	25cc
Category	Engine
Language	English

Summary

Maintenance Procedures

Air Filter Maintenance

Procedure for cleaning and replacing the engine air filter for optimal performance.

Spark Plug Service

Guidelines for spark plug inspection, cleaning, gapping, and replacement.

Troubleshooting Engine Problems

Troubleshooting Steps Overview

Outlines the systematic approach to diagnosing engine problems.

Defining Engine Problems

Identifying Problem Causes

Analyzes potential causes for engine starting and running issues.

Repairing Engine Issues

Details the process of performing repairs and verifying the fix.

Diagnostic Test Procedures

Describes the sequence and methods for performing engine diagnostic tests.

Prime Test Procedure

Procedure to test the fuel system by priming the engine.

Compression Testing

Instructions for performing and interpreting engine compression tests.

Ignition System Service

Troubleshooting the Ignition System

General steps to diagnose issues within the ignition system.

Testing the Ignition Module

Engine Stop Switch Test

Fuel System and Carburetor

Fuel System Troubleshooting

Overview of diagnosing problems within the fuel delivery system.

Inspecting Fuel Quality

Checking Fuel-Oil Mixture

Fuel Filter Inspection

Fuel Line Inspection

Carburetor Troubleshooting

Diagnosing issues with the carburetor, often by elimination.

Carburetor Disassembly

Carburetor Reassembly

Starter System Service

Recoil Starter Removal

Starter Rope, Pulley, and Springs

Clutch and Drive Shaft

Drive Shaft Assembly Removal

Clutch Removal and Replacement

Engine Assembly and Disassembly

Engine Disassembly Procedure

Engine Reassembly Procedure

Instructions for correctly reassembling the engine components.