1984-1985 Honda ATC125M Three-Wheeler Service Manual

Get your Honda ATC125M back in top shape with this factory service manual. Covers 1984-1985 models with procedures for engine, chassis, and electrical systems. Includes specifications and diagrams. PN 61CS300.

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Document Details

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Document Number / Seller:
24948 / Patricia Harris
File Size:
23.81 MB
File Type:
PDF
Language:
English
Pages:
231
Printable:
Yes
Category:
Three-Wheeler
Last updated / verified
Feb 18, 2025

Models Covered & Key Technical Specifications

Honda ATC125M (61CS300) — 1984–1985 Covers ATC125M with procedures for engine, chassis, and electrical systems. | ATC125M Series Portfolio.

  • System Displacement Data: 124 cc (7.6 cu in) is standardized to the engine cylinder volume Sequences.
  • Core Compression Ratio: For optimal performance, 8.8:1 is rated at the combustion chamber geometry Baseline.
  • Specific Torque Output: The maximum power specification sets 0.89 kg-m (6.45 ft-lb) at 5,500 rpm Requirements.
  • Critical Fuel Capacity: The fuel tank requires 7.7 liters (2.0 US gal, 1.70 Imp gal) for standard operation Threshold.
  • Universal Spark Plug Gap: Electrode spacing is calibrated to 0.6–0.7 mm (0.024–0.028 in) core measurement Mapping.
  • Calibrated Valve Clearance: Intake and exhaust valve settings specify 0.07 mm (0.003 in) cold adjustment Configuration.

Professional Workshop Service Manual & Technical Specifications

Honda ATC125M 1984-1985 Service Manual Service-Catalog

Serial-Range: 1984-1985 // Documentation-Type: Three-Wheeler Service Manual / Three-Wheeler Manual // Technical-Scope: Covers engine, chassis, electrical, fuel, maintenance, ignition, and drive systems.

Component Baseline Calibration-Standards
Cylinder Compression 12.5 ± 1.5 kg/cm² (177.8 ± 21.3 psi) 9.0 kg/cm² (128.0 psi)
Camshaft O.D. 19.934-17.945 mm (0.7060-0.7065 in) 17.90 mm (0.705 in)
Rocker Arm O.D. 9.972-9.987 mm (0.3926-0.3932 in) 9.92 mm (0.391 in)
Valve Face Width 1.2-1.5 mm (0.05-0.06 in) 1.8 mm (0.07 in)
Drive Chain Length (31 pins) 381 mm (15.00 in) 385 mm (15.16 in)
Spark Plug Gap 0.6-0.7 mm (0.024-0.028 in) N/A

Engineering chapters address maintenance, troubleshooting, and repair procedures for the Honda ATC125M.

Technical notes are provided for the front and rear brake systems, including adjustments and specifications.

Quality checks are addressed for the engine oil, oil filter, and lubrication points, ensuring optimal performance.

The ignition system section documents procedures for checking the CDI unit, pulse generator, and ignition timing.

The troubleshooting chapter addresses common issues such as hard starting, poor idling, and engine performance problems.

Cooling system maintenance is addressed in the engine removal/installation section, detailing component removal and reassembly.

This manual documents torque specifications for critical components to ensure proper thermal expansion compensation.

FAQ

What is the **required** fluid capacity for the Honda ATC125M? keyboard_arrow_down

1.1 liters (1.16 US qt, 0.97 Imp qt) is the engine oil capacity after draining and refill.

Calculate the **specified** component identification for the drive chain. keyboard_arrow_down

For a drive chain length of 31 pins, the standard length is 381 mm (15.00 in), with a service limit of 385 mm (15.16 in).

What values are **essential** for valve adjustment procedures? keyboard_arrow_down

0.07 mm (0.003 in) is the essential cold valve clearance for both intake and exhaust valves.

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Reviews (5)

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Rated 4 out of 5 stars
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I love how detailed this manual is. It's easy to follow and covers everything you need.
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The step-by-step instructions made engine removal a breeze. Highly recommend!
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This manual has been a lifesaver for my maintenance needs. The troubleshooting section is particularly helpful!
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The download process was smooth, and I received quick responses to my questions. Excellent service!