1996–2006 Yamaha XT225N / XT225NC Serow 225 Service Repair Manual with Supplements (P/N LIT-11616-14-42)

This Yamaha service manual set for the 1996–2006 XT225N and XT225NC Serow 225 combines the N/NC supplement, P/N LIT-11616-14-42, first edition October 2000, with the XT225H/HC supplement and XT225D/DC base manual.

The 427-page PDF includes the base manual, both supplements, and two additional cover pages. It combines searchable text with scanned pages.

• Engine repair: Cylinder-head overhaul, valve and valve-guide service, piston inspection, crankcase separation, and crankshaft installation.

• Clutch and transmission: Wet-clutch inspection, gear and shift-fork checks, balancer alignment, and drivetrain reassembly.

• Fuel system: MIKUNI BST34 carburetor teardown, diaphragm inspection, float and fuel-level checks, and throttle-cable adjustment.

• Chassis service: Front-disc and rear-drum brake repair, hydraulic bleeding, fork rebuilding, steering bearings, and swingarm clearance adjustment.

• Electrical diagnosis: CDI ignition and starting-circuit troubleshooting, starter-motor repair, charging tests, and lighting and signal fault charts.

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

Model-Specific Supplements

The N/NC tables distinguish standard 4BEV from California 4BEW configurations, including separate carburetor identification marks and California canister routing. Earlier H/HC and D/DC sections retain their own US, California, and Canadian specifications.

Yamaha specifies using the N/NC supplement with both earlier publications. The updated ignition-coil and magneto specifications help prevent earlier test values from being applied to N/NC electrical components.

Engine Overhaul and Drivetrain Repair

The engine chapter covers valve-seat refacing, valve-guide replacement, rocker-arm inspection, and bottom-end repair. Camshaft runout limits, piston-to-cylinder clearances, a lubrication diagram, fluid-capacity data, and component-specific torque tables support the inspection procedures.

Assembly coverage includes SOHC valve timing, balancer gear alignment, and shift mechanism checks. Yamaha flags crankshaft movement during camshaft installation as a cause of incorrect timing or damage.

Tool callouts identify the YU-01135-A crankcase separator and YM-91042 universal clutch holder.

Carburetor and California Emissions

The BST34 section includes a carburetor sectional view and explains the coasting enricher, with diaphragm, needle-valve, and valve-seat inspection. Float-height measurement and fuel-level adjustment are separate procedures, supported by the YM-01312-A fuel-level gauge.

California coverage includes canister inspection, the rollover valve, and emission-hose routing. The N/NC supplement also documents the two-cable throttle adjustment.

Brakes, Forks, and Rear Suspension

Front-brake exploded views accompany caliper and master-cylinder repair; rear-brake coverage includes shoes, the camshaft, and drum inspection. The brake section warns that solvent cleaning can swell and distort hydraulic seals.

Suspension work covers fork seals and bushings, fork-oil specifications, steering-head bearing assembly, linkage lubrication, and swingarm shim selection. Rear-shock coverage includes adjustment, inspection, removal, and replacement; the pressurized nitrogen unit is not covered as an internal rebuild.

Follow the manual’s safety precautions for brake hydraulics, fuel handling, and supporting the motorcycle.

Electrical Circuits and Fault Tracing

The XT225N/XT225NC Wiring Diagram accompanies the earlier circuit diagrams. Examples include the Ignition System and Electrical Starting System diagrams, with switch-connection charts and component-location drawings supporting the tests.

Troubleshooting covers no or intermittent spark, a starter that will not operate, charging faults, and lighting and signal failures. Specifications include bulb wattages, coil resistance, and starter wear limits, with handlebar and frame cable-routing drawings.

PDF Contents and Readability

The page totals below already include the publications’ introductory pages and internal blank pages:

• N/NC supplement: 37 pages.
• H/HC supplement: 19 pages; P/N LIT-11616-10-05.
• D/DC base manual: 369 pages; P/N LIT-11616-07-99.
• Additional covers: 2 pages marked LIT-11616-XT-25.

Text search: PDF pages 1–37 contain searchable text. Pages 38–427 are scans without an embedded OCR text layer.

Navigation: Embedded bookmarks link to the supplements and main chapters. The base-manual bookmark is mislabeled “XT250D(C)”; the document itself is XT225D/DC.

Diagram readability: Small wiring labels require magnification. The scanned circuit diagrams retain visible background noise.