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Lisa FreemanJul 26, 2025
What to do if the oil level is low in my Yamaha MZ175 Engine?
- SSamantha WashingtonJul 26, 2025
If the engine oil level is low in your Yamaha Engine, simply add more engine oil.
What to do if the oil level is low in my Yamaha MZ175 Engine?
If the engine oil level is low in your Yamaha Engine, simply add more engine oil.
What to do if Yamaha Engine has a faulty battery or starter motor?
If you suspect a faulty battery or starter motor in your Yamaha Engine, it is recommended you consult a Yamaha dealer.
Details scheduled maintenance tasks and their intervals.
Key technical specifications for various engine models.
Detailed maintenance specifications for engine components like pistons and rings.
Specifications for carburetor type, jets, and float height.
Specifications for ignition system, spark plugs, and TCI components.
Torque specifications for specific engine components.
Details scheduled maintenance tasks and their intervals.
Key technical specifications for various engine models.
Detailed maintenance specifications for engine components like pistons and rings.
Specifications for carburetor type, jets, and float height.
Specifications for ignition system, spark plugs, and TCI components.
Torque specifications for specific engine components.
This document is a Supplementary Service Manual for Yamaha Multi-Purpose Engines, specifically covering the MZ125, MZ125R, MZ175, MZ175R, MZ200, and MZ200R models. It is identified by the manual number 7NN-F8197-E1 and was first published in December 2010. This supplementary manual is intended to be used in conjunction with the main Service Manual for the MZ125 and MZ175 models (7NN-28197-E0 (310083)) to provide updated service information and data.
The manual is structured to guide qualified mechanics through maintenance and repair procedures, assuming a foundational understanding of Multi-Purpose Engine technology. It emphasizes safety through the use of a safety alert symbol and "WARNING" notations for potential personal injury hazards, and "NOTICE" for precautions against machine damage. "TIP" notations offer additional helpful information for easier or clearer procedures. The manual's format is sequential, step-by-step, and includes exploded diagrams to aid in identifying components for disassembly and assembly.
The manual describes the maintenance and service procedures for Yamaha Multi-Purpose Engines, which are air-cooled, 4-stroke gasoline OHV (Overhead Valve) engines. These engines are designed for various applications, indicated by the "Multi-Purpose Engine" designation. The "R" suffix in model names like MZ125R, MZ175R, and MZ200R suggests a reduction model, implying a gear reduction unit integrated for specific applications requiring lower output shaft speeds and higher torque.
The engines are designed for versatility, as implied by "Multi-Purpose Engine." The availability of standard and reduction models (indicated by "R" suffix) suggests adaptability to different power take-off (PTO) requirements. Standard models (MZ125, MZ175, MZ200) operate at a rated engine speed of 3600 r/min, while reduction models (MZ125R, MZ175R, MZ200R) operate at 1800 r/min, indicating they are suited for applications requiring lower rotational speeds. The recoil starter provides a manual starting mechanism.
The manual outlines a comprehensive periodic maintenance schedule to ensure reliable operation and extended service life. This schedule includes:
The manual also provides detailed tightening torque specifications for various components, including cylinder head, crankcase cover, spark plug, connecting rod, and flywheel magneto, to ensure proper assembly and prevent damage. General torque specifications for standard ISO pitch threads are also provided, with instructions for crisscross tightening patterns for multi-fastener assemblies.
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