1991-2001 Honda GX240K1 / GX270 / GX340K1 / GX390K1 Service Manual
Service data for Honda GX240K1, GX270, GX340K1, GX390K1 engines. Covers maintenance, repair, and specifications, publication PSV52306-A.
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Sample pages from the 1991-2001 Honda GX240K1 / GX270 / GX340K1 / GX390K1 Service Manual manual
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Honda Models Covered & Key Technical Specifications
Models: GX240K1, GX270, GX340K1, GX390K1
Sub-models / Variants: 1/2 Reduction, 1/6 Reduction, Electric Starter, Recoil Starter, Cyclone Air Cleaner, Silent Type, Standard Type
Build Years: 1991–2001
Technical Data:
- Engine type: 4-stroke, OHV, single cylinder, inclined by 25°
- Displacement: 242 cc (GX240K1), 270 cc (GX270), 337 cc (GX340K1), 389 cc (GX390K1)
- Compression ratio: 8.2:1 (GX240K1, GX270), 8.0:1 (GX340K1, GX390K1)
- Maximum power output: 9.7 kW (13.0 HP) at 3,600 min⁻¹ (GX390K1)
- Ignition timing: 20° BTDC (GX240K1, GX270), 25° BTDC (GX340K1, GX390K1)
- Ignition system: Transistorized magneto ignition
- Engine oil capacity: 1.1 liters (1.16 US qt)
- Fuel type: Unleaded gasoline (octane 86 or higher)
- Spark plug: BPR6ES (NGK), W20EPR-U (DENSO)
Honda Manual Features & Content Preview
Honda GX240K1, GX270, GX340K1, GX390K1 Engine Service Manual
- Fits 1991–2001 Honda GX240K1, GX270, GX340K1, and GX390K1 engine models with various reduction and starting configurations
- Official Honda OEM publication P/N 61ZH910, July 2001 edition
- Contains detailed technical specification tables, exploded-view diagrams for all engine systems, and electrical wiring schematics
- Delivered as a direct download the moment payment clears
- Full-text search finds any part number in seconds
- Laid out for standard letter and A4 printing
- This 111-page service manual is the definitive reference for the GX-series engine build, detailing standard maintenance and engine overhaul specifications
Technical Scope and Documentation
The 1991–2001 Honda GX240K1, GX270, GX340K1, and GX390K1 service manual provides extensive coverage of engine maintenance and mechanical system documentation. Chapters detail disassembly and reassembly of the recoil starter, fan cover, carburetor, fuel tank, governor, flywheel, ignition coil, starter motor, cylinder head, valves, crankcase cover, and reduction units. This publication explains how factory workshop documentation is structured to assist technicians in identifying component-level specs and system functions.
Specification Highlights
This Honda GX240K1–GX390K1 manual includes comprehensive data tables for engine assembly and tuning. Valve clearance for the intake is listed at 0.15 ± 0.02 mm in the cylinder head specification table. The GX340K1 engine requires 20° BTDC fixed ignition timing. Maximum torque for the GX240K1 flywheel nut is documented at 113 N·m (83 lbf·ft). Intake valve head diameter for the GX390K1 is 35 mm. Cylinder compression for the GX270 is specified at 0.59–0.83 MPa (85–121 psi) at 600 min⁻¹. Reference values for resistance, clearances, and torque settings are included for all four engine variants.
Note: This page is a contents overview for the manual. It does not provide repair or diagnostic instructions. An official 111-page Honda OEM service manual covering the 1991–2001 GX240K1, GX270, GX340K1, and GX390K1, documenting engine, ignition, cooling, and fuel system specifications for the K1-series engine lineup.
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