1988-1989 Honda VTR250 Service Manual (P/N C4077-90960)
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Honda Models Covered & Key Technical Specifications
Models: Honda VTR250
Model Years: 1988–1989
Serial Numbers: JHM025047D3
Technical Data:
- Engine type: Water-cooled 4-stroke DOHC 90° V-twin
- Displacement: 250 cc
- Compression ratio: 11.0:1
- Transmission: 6-speed constant mesh
- Fuel system: Constant velocity dual carburetors (VD10C/VD10D)
- Cooling system capacity: 1.4 liters (main system), 0.3 liters (reserve tank)
- Oil capacity: 1.5 liters (after draining), 2.0 liters (after oil filter change), 2.5 liters (disassembly)
- Engine idle speed: 1,500 ± 100 rpm
- Spark plug gap: 0.8–0.9 mm
- Valve clearance: 0.17 ± 0.02 mm (cold)
Honda Manual Features & Content Preview
- Covers 1988–1989 Honda VTR250 motorcycle variants, including California-specific emission control configurations
- Official Honda publication 61550-MV1-880, issued September 1988
- 100 pages of technical specifications, exploded-view diagrams, maintenance schedules, and electrical wiring schematics
- Serves as the primary shop reference for managing the liquid-cooled DOHC V-twin powertrain and chassis components
Technical Content and Maintenance Details
This manual breaks down system-specific information for major assemblies on the VTR250, including the engine, fuel delivery, cooling system, and clutch. Procedural overviews define factory maintenance intervals for the air cleaner, spark plugs, valve clearances, and drive chain. When you need to trace a harness or rebuild a sub-assembly, the manual provides exploded diagrams illustrating exactly how components fit within the frame and engine housings. Detailed lubrication schematics map out every critical service point. Diagnostic sections are also included to help mechanics identify common engine performance issues through systematic verification of carburation, ignition, and compression thresholds.
Specifications and Reference Values
Technical tables document critical engine values like the 1,500 rpm idle speed and 1,320 ± 200 kPa cylinder compression pressure. Keep in mind that working on these V-twins requires strict adherence to factory tolerances to maintain safe road conditions and prevent unexpected mechanical failure. The cooling system section lists a 75–105 kPa radiator cap relief pressure. Torque values are clearly standardized across the chassis; the swingarm pivot bolt requires 65 N-m, while front brake caliper bolts are set to 30 N-m. Valve clearance for both intake and exhaust sits at exactly 0.17 ± 0.02 mm. Engine oil capacity for a standard filter change is documented at 2.0 liters. For tuning, the constant velocity carburetor pilot screw initial setting is established at 2-1/8 turns out for standard configurations.
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