Benelli TNT25 BN251 Service Manual PDF – Complete Workshop Repair Guide

Description

File Details

• Manual Type: Service Manual / Motorcycle Maintenance Manual
• Brand: Benelli (Zhejiang Qianjiang Motorcycle Co., Ltd.)
• Models Covered: TNT25 (BN251), BJ250-15A, BJ250-15 (Europe), BJ250-15 (Non-Europe)
• Engine: 249cc single-cylinder, four-stroke, DOHC, liquid-cooled
• Language: English
• File Format: PDF
• Page Count: 449 pages

Chapters Covered

• Chapter I — Basic Information: Notes before maintenance, battery installation, sharp edge precautions, solvent handling, cleaning and storage of removed parts, replacement parts, assembly order, fastening order, tightening torque, force application, gaskets and O-ring seals, silicone sealant and locking agents, press fitting, bearings, oil seals, circlips, lubrication, engine rotation direction, wiring and cable connector checks, cable arrangement, tools, model information, basic specifications, general technical parameters, unit conversion table
• Chapter II — Regular Maintenance: Regular maintenance table, torque and locking agent specifications, main locking torque values, nut/bolt/screw fastening torques, EFI checking, throttle control system, fuel hose checks, fuel evaporation and recovery system, cooling system checks, coolant level, radiator pipe inspection, valve clearance checking and adjustment, air inlet device inspection, clutch checks, wheel and tire inspection, tire pressure and tread wear, wheel bearing checks, final drive mechanism, drive chain lubrication and slackness, wheel alignment, brake checks, brake fluid level, brake pad wear, brake lamp switch, suspension system checks, steering system, electrical system checks, lamp and switch inspection, headlamp accuracy, side stand switch, engine stop switch, frame lubrication, bolt and nut tightness, replacement procedures for air filter, fuel hose, coolant, radiator hose, oil, brake hose, brake fluid, brake master cylinder rubber parts, caliper rubber parts, spark plug
• Chapter III — Fuel Injection System: EFI introduction, EFI system overview, EFI part positions, technical parameters, fuel tank and exploded view, fuel evaporative recovery system, fuel tank disassembly, EFI service notes, ECU (MT05) operation and installation, fuel pump working principle and maintenance, throttle body operation and disassembly, fuel injector working principle and installation, engine temperature sensor, intake air temperature sensor, manifold absolute pressure sensor, oxygen sensor, idle speed stepper motor, carbon canister solenoid valve, fault diagnosis methods, diagnostic tools, PCHUD software, trouble code tables, common troubleshooting
• Chapter IV — Cooling System: Exploded view, coolant flow diagram, technical parameters, coolant checking and replacement, pressure testing, cooling system cleaning, reserve tank removal, coolant pump disassembly and installation, impeller check, radiator and radiator fan removal and installation, radiator inspection, thermostat removal, installation and testing, hose and pipeline installation and checking, coolant temperature sensor
• Chapter V — Engine: Lubrication system, oil passage diagram, oil pump, cylinder head and camshaft, valve and valve guide, cylinder and piston, piston rings, crankshaft connecting rod, balance shaft, tensioner, clutch, shift mechanism, primary and secondary shaft components
• Chapter VI — Chassis: Wheel and tire, front and rear wheel exploded views, technical parameters, special tools, wheel removal and installation, hub bearing, static balance adjustment, tire repair, drive mechanism, drive chain, sprockets, shaft sleeves, brakes, front and rear brake exploded views, brake handle and pedal, calipers, brake pads, brake master cylinder, brake discs, brake fluid, brake hose, suspension system, front and rear suspension exploded views, front shock absorber, rear shock absorber, rear swing arm, steering system, steering stem, handlebar, frame, side stand, pedals, muffler, fenders, body covers, seat cushion, rear handrail, tail cover, radiator fairing, bottom cover
• Chapter VII — Electrical System: Precautions, technical parameters, special tools, electrical wiring inspection, charging system, battery, magneto, voltage regulator/rectifier, ignition system, crankshaft sensor, ignition coil, spark plug, ECU, starting system, starter motor, starter relay, lighting system, headlight, instrument, switches and sensors, main switch, handle switch, brake lamp, side stand switch, speed sensor, oxygen sensor, fuel level sensor, horn, fan, fan switch, relay and fuse box, fuses
• Chapter VIII — Appendix: Routing of cable, wire and hose, main harness routing, throttle cable routing, clutch cable routing, other routing matters, troubleshooting guide, circuit diagram, electrical diagram, special tool list summary

This Benelli TNT25 BN251 service manual is a comprehensive workshop document covering the complete maintenance, repair, and diagnostic procedures for the TNT25 (BN251) motorcycle platform, including the BJ250-15A, BJ250-15 (Europe), and BJ250-15 (Non-Europe) variants. The manual is structured to guide technicians through every major system on the machine, from basic maintenance routines to complete engine disassembly and electrical fault tracing. Each chapter includes exploded views, technical specifications, torque values, service limits, and step-by-step procedures supported by illustrations and photographs. The fuel injection chapter provides detailed coverage of the Delphi MT05 ECU system, including sensor operation, fuel pump maintenance, throttle body service, and diagnostic trouble code retrieval. The electrical system chapter includes complete wiring information, component testing procedures, and relay/fuse diagnostics. Whether you are performing a routine valve clearance check, replacing a drive chain, servicing the cooling system, or diagnosing an EFI fault, this manual provides the procedures and specifications required to complete the work correctly.

What This Benelli TNT25 Service Manual Enables You to Do

This Benelli TNT25 BN251 service manual is designed for well-trained mechanics working in properly equipped shops, but it is also suitable for owners who have basic mechanical knowledge and want to maintain or repair their own motorcycle. The manual assumes access to appropriate tools and measuring instruments, and it specifies special tools where required. With this manual, you can:

• Perform all scheduled maintenance procedures according to the regular maintenance table, including valve clearance checks, oil and filter changes, coolant replacement, brake fluid service, and drive chain adjustment
• Diagnose and repair electronic fuel injection faults using the fault lamp flash codes, diagnostic tool, or PCHUD software
• Remove, disassemble, inspect, and reassemble the engine, including cylinder head, camshaft, valves, cylinder, piston, crankshaft, connecting rod, balance shaft, clutch, and transmission components
• Service the cooling system, including coolant pump, radiator, thermostat, and hoses
• Maintain and repair the chassis, including wheels, tires, hub bearings, drive chain, sprockets, brakes, calipers, brake master cylinders, suspension, steering system, frame, and bodywork
• Troubleshoot electrical system faults, including charging system, ignition system, starting system, lighting, instruments, switches, sensors, relays, and fuses
• Reference accurate torque values, service limits, clearances, and adjustment specifications for every major component
• Follow proper cable, wire, and hose routing during reassembly to prevent interference and ensure reliable operation

Why the Benelli TNT25 BN251 Service Manual Matters

Working on a modern motorcycle without the correct procedures and specifications can lead to damaged components, poor performance, and safety hazards. This Benelli TNT25 workshop manual provides the exact torque values, service limits, and diagnostic procedures that the manufacturer specifies for the TNT25 (BN251) platform. The manual covers the Delphi MT05 EFI system in detail, including sensor testing, fuel pressure checks, and trouble code diagnostics, which are essential for maintaining smooth engine operation and emissions compliance. The electrical system chapter includes complete circuit diagrams and component test procedures, enabling accurate fault tracing rather than guesswork. For engine and chassis work, the exploded views and step-by-step disassembly/assembly instructions help prevent costly mistakes such as incorrect fastener tightening sequences, damaged seals, or misaligned components. Routine maintenance procedures are supported by clear specifications for fluid types, capacities, and adjustment ranges, ensuring the motorcycle remains reliable and safe to ride.

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Instant PDF Delivery — No Shipping, Any Device, Printable

This Benelli TNT25 BN251 service manual is delivered as a PDF file immediately after purchase. There is no physical shipping, no waiting for a package, and no restrictions on how you use the file. You can view it on any device — laptop, tablet, or smartphone — and print individual pages or entire chapters as needed for use in the workshop. The PDF format allows you to zoom in on detailed illustrations, exploded views, and wiring diagrams, making it practical for both desk reference and hands-on repair work. Whether you are a professional mechanic, a workshop owner, or a Benelli TNT25 owner performing your own maintenance, this manual provides the technical information you need to complete the job correctly and efficiently.