1990–2001 Johnson Evinrude 1.25–70 HP Inline Outboard Motor Service & Repair Manual (P/N 1312)

This SELOC service and repair manual (Stock No. 1312) covers 1990–2001 Johnson Evinrude 1.25–70 HP inline outboards, including one-, two-, three-, and four-cylinder engines in two-stroke and four-stroke configurations.

• Powerhead repair: Removal and installation, cylinder-head and cylinder-block overhaul, piston and bearing inspection, and timing-belt or timing-chain service.

• Fuel systems: Carburetor overhaul and linkage synchronization, fuel-pump testing, and Electronic Fuel Injection (EFI) diagnosis for the covered four-strokes.

• Ignition and electrical: Breaker-point, CDI/UFI, and ECU-controlled ignition tests, starter service, stator and regulator/rectifier checks, neutral safety switches, and wiring diagrams.

• Lubrication and cooling: AccuMix, VRO2, and integral oil-mixing systems, water-pump impeller service, thermostat testing, and cooling-system troubleshooting.

• Lower units and jet drives: Gearcase removal and installation, propeller-shaft seal replacement, jet impeller inspection, and reverse-gate adjustment.

• Trim and tilt: Conventional and FasTrak system identification, electrical and hydraulic fault diagnosis, cylinder service, and trim-sender adjustment.

• Controls and manual starters: Remote-control disassembly, shift and throttle cable adjustment, and hand rewind starter rope, spring, and mechanism repair.

Written for boat owners as well as experienced DIYers and technicians, the manual combines maintenance basics with overhaul work that calls for precision measuring tools and, where needed, marine machine-shop support.

Engine Identification and Powerhead Work

Horsepower alone does not identify an engine family: the 9.9 HP range includes several two-stroke and four-stroke designs. Model-code charts help match the motor to the correct procedure before ordering parts or taking it apart.

Internal repair coverage includes crankshaft and connecting-rod inspection, piston-ring checks, cylinder measurements, and bearing selection. Exploded assemblies and tightening-sequence drawings support reassembly; specification tables provide wear limits, clearances, and component torques.

Valve timing: The 40/50 HP EFI four-strokes use a timing chain that requires powerhead removal for access, while the other covered four-strokes use belts. The chain-drive instructions warn that incorrect crankshaft-to-camshaft timing can bring valves and pistons into contact.

Carburetion, EFI, and Electrical Diagnosis

Carburetor sections distinguish linkage arrangements and synchronization procedures by engine family. Tune-up references include spark-plug specifications, ignition timing, and the timing-pointer adjustment used on applicable 1990 models.

For 40/50 HP and 70 HP EFI four-strokes, fuel-circuit diagrams show low- and high-pressure delivery through the vapor separator tank. Component procedures cover injectors, the Engine Control Unit (ECU), Idle Air Control (IAC) valve, and related sensors.

Diagnostic trouble-code charts, symptom charts, and ECU connector pinouts help distinguish a wiring or connector fault from a failed component before replacement. Electrical coverage also explains charging circuits, warning systems, and ignition-wire routing.

Fuel vapors and high-voltage ignition require proper ventilation and personal protective equipment during service.

Oil Delivery and Cooling Service

VRO2 coverage includes fuel/oil delivery tests, warning-circuit checks, and pump disassembly, supported by a troubleshooting chart. The integral oil tank and mixing unit on three-cylinder 25/35 HP motors have separate service procedures.

AccuMix repair limits: Fuel-tank-integrated units have limited internal repair options; the canister-base oil pump is replaced as an assembly. Fuel/oil recommendations distinguish normal operation, break-in, and high-performance use, including exceptions for automatic oiling systems.

Model-specific cooling schematics accompany water-pump overhaul and thermostat procedures. Water-pump cutaway views show the relationship between the impeller and housing.

Gearcases, Jet Drives, and Trim Systems

Gearcase instructions focus on removal, installation, and propeller-shaft seal replacement, with exploded views and bearing-carrier sections showing internal parts. Jet-drive coverage adds impeller shimming and reverse-gate cable adjustment. Its service notes warn that weakened, reused impeller locktab washers can let the nut loosen and damage the drive.

Conventional and FasTrak trim/tilt systems have separate wiring diagrams and service sections. FasTrak cylinder-overhaul procedures are included, while its pump, valve body, and motor are treated as replacement assemblies.

Remote-control sections distinguish surface-mount, concealed side-mount, and binnacle units, with shift-linkage and cable checks after assembly.

Seasonal Maintenance and Recovery

Winter-storage and spring-commissioning checklists cover fuel, lubrication, and corrosion protection. Further procedures address sacrificial anodes and clearing a submerged motor. The opening chapters explain workshop safety, tool selection, marine fasteners, and metric and SAE torque charts.

Compression and Valve-Clearance Preview

These figures are a small selection of the manual's tune-up specifications.

For engines at normal operating temperature, carbureted multi-cylinder motors should have no more than 15 psi (100 kPa) difference between the highest and lowest compression readings. On the covered EFI motors, the lowest reading should be at least 80% of the highest.

For 5/6 HP four-strokes, valve clearance is 0.003 in. intake and 0.005 in. exhaust with the engine overnight cold, approximately 68°F (20°C).

PDF Search, Diagrams, and Page Breakdown

Text search and diagram detail: The PDF is partially searchable through its existing OCR; some table entries, diagram labels, and index pages cannot be searched. There are no embedded PDF bookmarks. Small wiring labels require magnification, and some fine circuit lines are faint.

The download contains one printable, English-language 583-page PDF: one opening cover page, two contents pages, 574 chapter pages, and six master-index pages. All of these pages are included in the total.