1991 Yamaha FZR400SP Service Manual Set with FZR400RR Supplement (P/N 3TJ-ME1)

This Yamaha service manual set combines the FZR400SP main manual (P/N 3TJ-ME1, first edition, November 1990) with the FZR400RR ’92 supplementary service manual (cover code 3TJ-AE1, first edition, September 1991). The supplement provides RR-specific updates and is intended to be used with the included SP manual.

• Engine repair: Removal and reinstallation, cylinder-head and valve work, piston inspection, crankshaft-bearing selection, and camshaft timing.

• Clutch and transmission: Clutch-pack and starter-clutch service, gear and shaft inspection, and shift-fork and shift-drum checks.

• Fuel and EX-UP: Mikuni BDST32 carburetor disassembly, synchronization, fuel-level inspection, exhaust-valve cable adjustment, and servomotor troubleshooting.

• Cooling system: Radiator pressure testing, thermostat checks, water-pump inspection, and coolant replacement.

• Brakes and chassis: Caliper and master-cylinder service, hydraulic bleeding, fork overhaul, steering-bearing work, and swingarm inspection.

• Electrical diagnosis: T.C.I. ignition, AC magneto charging, starter interlocks, fuel-pump control, cooling-fan circuits, and system-specific test charts.

Written primarily for Yamaha dealers and their qualified mechanics, these manuals assume familiarity with motorcycle service and repair.

Engine, Clutch, and Transmission Repair

Valve-clearance work includes adjusting-pad selection charts and camshaft timing references. The assembly instructions warn that uneven tightening of the camshaft caps can damage the caps, camshafts, or cylinder head.

Crankshaft and connecting-rod sections explain bearing identification and oil-clearance checks. Exploded assembly views and tightening-sequence illustrations accompany reassembly, while gearbox inspection covers gear engagement, shift-fork condition, and shaft runout.

Clutch inspection distinguishes friction-plate wear, plate warpage, and damage to the clutch-boss splines. Separate starter-clutch coverage addresses its rollers, springs, and associated gears.

Carburetors, EX-UP, and Cooling

Carburetor inspection separates diaphragm, jet-needle, float, and needle-valve faults. Synchronization and fuel-level procedures accompany the disassembly and assembly instructions.

The EX-UP test charts distinguish cable or valve problems from servomotor, wiring, and ignitor faults. This supports fault isolation before choosing between mechanical service and electrical component repair.

Cooling-system coverage includes radiator-cap testing and thermostat inspection, along with water-pump housing and impeller checks. Hose routing and assembly references support reinstallation after engine or cooling-system work.

Chassis Service and RR Differences

The Deltabox chassis sections cover static wheel balancing, steering-head bearings, and suspension linkage service. Fork instructions warn that bottoming the inner tube during disassembly can damage the oil-lock piece.

RR updates add oil-cooler service and a different front-fork procedure. The supplement identifies the RR fork’s lack of spring-preload adjustment and the RR rear shock’s lack of rebound and compression damping adjustment. These distinctions help avoid applying SP suspension settings to the RR.

Follow the manual’s safety precautions for hydraulic brakes, hot coolant, and the pressurized rear shock absorber.

Circuit Diagrams and Fault Isolation

Ignition, starting-circuit, charging, and fuel-pump circuit diagrams accompany switch-continuity tables and diagnostic charts. The starting-circuit explanation shows how the neutral, clutch, and sidestand switches affect starter operation.

Separate GB and F wiring diagrams and a coolant-flow diagram are included in the RR supplement. Electrical testing references identify Yamaha pocket tester 90890-03112 and the relevant connector terminals.

A Preview of Valve-Train and Drive-Chain Specifications

These examples are a small selection of the service data in the main manual and supplement.

For the FZR400SP, cold intake-valve clearance is 0.11–0.20 mm, and the camshaft-cap bolt specification is 10 Nm (7.2 ft-lb).

Drive-chain slack differs by model: 15–20 mm for the FZR400SP and 35–45 mm for the FZR400RR. Both values apply at the chain’s tightest point with the motorcycle upright, both wheels on the ground, and no rider.

PDF Contents and Readability

Text search and page condition: The PDF has no searchable text or embedded bookmarks. Small wiring labels require zooming, and some remain difficult to read. PDF pages 204, 206, 216, and 239 are incomplete, affecting a chapter divider, troubleshooting content, RR identification/specifications, and RR lighting circuits. Horizontal distortion also affects some wiring diagrams and other pages.

One printable PDF contains 245 pages across two publications:

Both publication covers and the nine chapter-divider pages are already included in these totals.