2006–2011 Honda TRX250EX / TRX250X Factory Service Manual (P/N 61HN655)

• Official 371-page Honda OEM factory publication (P/N 61HN655) covering the 2006–2011 TRX250EX and TRX250X ATVs.
• Details the air-cooled 229 cc longitudinal engine platform and fuel delivery systems across 2006–2007 and post-2007 regional variants.
• Provides 124 exploded-view diagrams, 18 detailed electrical schematics, and comprehensive torque tables.
• Serves as the primary reference for SportClutch transmission tear-downs and rebuild specs.
• Delivers essential PDF workshop guidelines, complete wiring diagrams, four-wheeler repair steps, and structured troubleshooting flowcharts.
• Outlines the rear driving mechanism, double wish-bone front suspension, hydraulic brake system, steering shaft, alternator, and electric starter.

Engine and Chassis Maintenance Data

When you pull a TRX250 into the bay, having exact tolerances on hand is critical. This manual breaks down the longitudinal-mount single-cylinder power unit from top to bottom. You get precise data on the lubrication system, including oil pump clearances, relief valve operation thresholds, and clear lubrication system diagrams. Dealing with a bogging issue? The fuel system chapters outline the exact main and slow jet identification for the PDC1G carburetor assembly. Instead of paying premium dealership labor rates, mechanics and DIYers can follow step-by-step instructions for tasks like high-altitude carburetor tuning, precise valve clearance adjustments, and bleeding the hydraulic brake system.

It also dives deep into the SportClutch system. The documentation details centrifugal and multi-plate clutch components, specific gear ratios for the 5-speed box, and acceptable shift fork tolerances. When overhauling these specific models, technicians often encounter distinct repair pitfalls. For instance, the centrifugal clutch lock nut utilizes left-hand threads, meaning standard counterclockwise force will instantly strip the crankshaft. Additionally, if the ring gear shim is too thick during final drive reassembly, the gears will lock up completely after only light tightening unless the pinion gear is continuously rotated. Before applying any of these specifications or torquing down components, always ensure the ATV is securely supported on a proper lift and the battery is disconnected to prevent accidental starting or injury during maintenance.

Diagnostics and Specification Previews

Professional service demands hard numbers and clear visual guidance. Navigating complex electrical and structural components is simplified by specific visual aids, including exact cable and harness routing diagrams, gear tooth contact pattern views, and emission control routing schematics. The cylinder head specification tables dictate a strict 0.13 mm intake valve clearance. Engine health diagnostics rely on accurate baseline metrics, with the manual documenting cylinder compression at 1,275 kPa at 800 rpm for this series.

Fluid capacities are clearly defined, noting a shift from the 10.2-liter fuel tank in 2006–2007 units to the 9.5-liter capacity found on post-2007 models. This document serves strictly as a comprehensive index of technical data and assembly overviews, empowering mechanics to verify parts and tolerances against factory standards. By providing these exact OEM benchmarks and workflows, this reference eliminates trial-and-error diagnostics, significantly reducing shop downtime and preventing costly comeback repairs during heavy drivetrain overhauls.