1978-1987 Honda 400, 450 Twins Service Manual

1978–1987 Honda 400/450 Twins Service Coverage

• The 1978–1987 Honda 400/450 Twins service manual provides technical data and maintenance procedures for the complete series of 400cc and 450cc parallel-twin motorcycles.
• Official Clymer publication M334, twelfth printing June 2001, covering engine, chassis, and electrical system specifications for the twin-cylinder platform.
• Features 14 distinct chapters including exploded-view diagrams, wiring schematics, and specialized maintenance tables for routine service and overhaul.
• Accessible from your device as soon as the order is placed.
• Laid out for standard letter and A4 printing.
• Contains 8 maintenance and tune-up tables specifically for the CB400/CM400/CM450/Rebel 450 model range.
• Documents the specific maintenance requirements for both 5-speed manual and automatic transmission variants across the 1978–1987 production lifespan.
• This fifth edition is the reference used for the 1983–1987 model updates, detailing the specific differences between the earlier 400cc machines and the later Rebel 450.

Technical Scope and Maintenance Structure

This manual details the procedures for engine, clutch, fuel, exhaust, suspension, and electrical systems. The content is organized by functional assemblies, starting with a fundamental guide to motorcycle tools, safety practices, and fastener identification. The general information section establishes standardized torque values and conversion charts necessary for proper assembly of internal engine and chassis components across the entire 1978–1987 Honda 400/450 Twins product line.

Specification Highlights and Data Preview

Technical data includes specific valve clearance tolerances, idle speed settings for automatic versus manual transmission models, and detailed engine oil capacities. Torque specifications for critical engine hardware, including cylinder head bolts and balancer chain adjusters, are provided in both Newton-meters and foot-pounds. Additional reference data covers tire pressure guidelines, front fork oil capacities by model, and drive chain replacement part numbers. Intake valve clearance is listed at 0.08–0.12 mm in the engine specification table. The automatic transmission oil capacity upon rebuild is documented at 3.3 liters. Ignition timing data for the 1978–1987 Honda 400/450 Twins is specified at 4,500–5,350 rpm for advance timing settings. This 411-page Clymer manual is a primary resource for owners and technicians performing routine service or complex overhauls on the 1978–1987 Honda 400/450 Twins series, encompassing manual and automatic drivetrain variants.