2007-2008 Honda TRX420 Rancher Service Manual (P/N 07ZAJ-S5A0111)

• Official 498-page Honda Motor Co. publication (PN 07ZAJ-S5A0111) for 2007–2008 Honda TRX420 FourTrax Rancher utility ATVs
• Covers 2WD/4WD, Electric Shift Program (ESP), and manual foot-shift variants
• Primary OEM technical reference for the 420cc PGM-FI engine platform and related chassis configurations
• Features 12 wiring schematics and 14 detailed torque specification tables for engine, frame, and drivetrain components

Component and System Documentation

This workshop manual delivers comprehensive data on all major assemblies. It heavily details the fuel-injected engine, cooling systems, and specialized 4WD mechanisms. You get clear maintenance benchmarks, from fluid capacities and filter specs to tire pressure standards. Moving past basic service, the documentation dives into complex mechanical teardowns. It covers clutch and gearshift linkages, frame body panels, and suspension geometry. Electrical architecture gets extensive coverage as well. Technicians will find precise pinouts and reference signals for the Powertrain Control Module (PCM) and related sensors.

Engine and Chassis Specification Highlights

Engine compression is documented at 500 kPa (73 psi) at 400 rpm. Intake valve clearance is strictly set at 0.15 ± 0.02 mm. For proper thermoregulation, the coolant system radiator cap pressure must hold between 108–137 kPa (16–20 psi). On the electrical side, the alternator charging system output is rated at 0.343 kW at 5,000 rpm. You will also find detailed lubrication and sealant point maps. These visual guides are crucial when dealing with the crankcase, alternator cover, and shift control motors. Keep in mind that all provided figures are for preliminary review. Safe, accurate shop work always requires consulting the full, original OEM documentation before turning any wrenches.