1990 Yamaha CV115E 115 HP Outboard Service Manual
Yamaha Models Covered & Key Technical Specifications
Models: CV115E
Sub-models / Variants: Long shaft (L), Ultra long shaft (UL)
Trade Names: Yamaha Marine Outboards
Model Years: 1990
Serial Numbers: 320363~
Technical Data:
- Engine displacement: 1,730 cc (105.57 cu. in)
- Horsepower: 115 HP at 5,500 rpm
- Engine type: 2-stroke, 4-cylinder
- Compression ratio: 5.7
- Fuel system: 2 carburetors, choke starting
- Cooling system: Water
- Ignition system: C.D.I. (Capacitor Discharge Ignition)
- Reduction gear ratio: 2.0 (13/26)
- Propeller drive: Spline
- Electrical fuse rating: 20 A
Yamaha Manual Features & Content Preview
- Covers the 1990 Yamaha CV115E 115 HP outboard, featuring detailed technical breakdowns for the 1,730 cc 2-stroke power unit and related marine hardware.
- Official OEM reference material documenting engine, chassis, electrical, and fuel-delivery specifications for the 320363~ serial number range.
- Supports comprehensive diagnostic and repair planning through 8 detailed exploded-view assembly diagrams and 14 maintenance specification tables.
- Highlights the unique loop-charge scavenging system specific to this 1st edition (April 1990, P/N LIT-18616-00-56) factory release.
Component Walkthrough
Reviewing the mechanical concepts and structural details of this 115 HP 2-stroke series provides technicians with exact baseline values. Procedural sections detail power unit assembly, fuel system integration, and lower unit gear train configurations. Working with marine service fluids and high-pressure hydraulic systems requires strict adherence to industrial hygiene and safety protocols. Always verify pressure relief and battery disconnection procedures before initiating any diagnostic work to prevent accidental injury or equipment damage.
Additional chapters examine bracket unit mechanics and trim-tilt hydraulic systems, outlining the necessary pressure testing and fluid bleed protocols. Electrical sections deliver essential reference values for the ignition timing, pulser coil resistance, and starter motor output.
Specification Highlights
Engine block tolerances list a maximum taper limit of 0.08 mm, while cylinder head warpage caps at 0.10 mm. Standard piston ring end-gap fits for the 115 HP model sit precisely between 0.30 and 0.40 mm.
For the powerhead, crankcase bolt torque values demand a two-stage process that finalizes at 40 Nm (29 ft-lb). Evaluating the lower unit requires gear case pressure testing maintained at 1.0 kgf/sq.cm (1.020 bar) for exactly 10 seconds. Finally, rectifier unit pinouts and electrical continuity charts guide proper repair preparations for the charging and ignition systems.
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