1978-1987 Honda 400, 450 Twins Service Manual

Technician-level documentation for Honda 400 & 450 Twins (1978-1987) covers engine, transmission, clutch, and more, with diagrams. Ref: M334

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Document Details

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Document Number / Seller:
25649 / Patrick King
File Size:
80.89 MB
File Type:
ZIP
Language:
English
Printable:
Yes
Category:
Bike
Last updated / verified
Jul 23, 2025

Models Covered & Key Technical Specifications

Expert Workshop Diagnostic Manual: Honda 400/450 Twins, 1978-1987 PDF Service-Dossier Honda 400/450 Twins (M334) -- 1978-1987. Library Resource | Volume.

  • Engineered Capacity Limits: 2.6 US qt. signifies the standard manual transmission oil capacity.
  • Design Play Limits: 3.2 US qt. requires precise measurement for the automatic transmission rebuild fill.
  • Documented Current Rating: 3.3 Liter defines the automatic transmission oil capacity upon rebuild.
  • Manufacturer Speed Rating: For optimal performance, 2.5 US qt. is the standard oil drain capacity.
  • System Volume: The standard engine oil capacity during a manual transmission rebuild is 3.2 US qt.
  • Principal System Volume: 2.5 Liter is the standard oil capacity for an automatic transmission refill.

Professional Workshop Service Manual & Technical Specifications

Expert Workshop Diagnostic Manual: Honda 400/450 Twins, 1978-1987 PDF Service-Dossier

Technical-Domain: Honda 400/450 Twins (M334) / motorcycle Logic // Design-Core: Repair Manual / Motorcycle System Logic // Technical-Domain: Troubleshooting and Maintenance Procedures.

HONDA 400/450 TWINS (1978-1987) MANUAL OVERVIEW

Specification Technical-Path Validation-Data
Manual Type Repair Manual Comprehensive
Model Years 1978-1987 All Covered
Engine 400cc, 450cc Detailed Sections
Transmission Manual & Auto Service Procedures
Fuel System Carburetion Diagnosis and Repair

Major sections focus on:

  • General Information
  • Troubleshooting
  • Lubrication, Maintenance and Tune-Up
  • Engine Procedures
  • Clutch and Manual Transmission Service
  • Torque Converter and Automatic Transmission
  • Wiring Diagrams

OEM guidelines are included for engine, transmission, and clutch systems, detailing disassembly, inspection, and reassembly. Methodical procedures cover troubleshooting common issues, providing clear instructions and illustrations. This manual documents torque specifications for critical engine components to ensure proper vibration dampening.

FAQ

Specify the **applicable** lubrication requirements for the drive chain. keyboard_arrow_down

SAE 80 or 90 gear oil is the specified lubrication for the drive chain, applied at the interval indicated in Table 1.

What is the **exact** testing parameters for tire pressure? keyboard_arrow_down

28 psi is the standard front and rear tire pressure for the CB450SC models, as indicated in the Quick Reference Data section.

Calculate the **specific** diagnostic procedures for engine overheating. keyboard_arrow_down

Overheating may be caused by worn piston rings and cylinder heads; over 85 pages cover engine diagnostics and repair for these and other issues.

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Reviews (4)

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This manual has been a lifesaver for my Honda 450. The troubleshooting section is particularly helpful!
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I found the wiring diagrams especially useful for my repairs. Highly recommend!
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Rated 4 out of 5 stars
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Rated 4 out of 5 stars