Target Audience:
Owners and technicians seeking in-depth knowledge for maintaining and repairing Yamaha DT250 and DT360 motorcycles.
Manual Advantage:
Provides comprehensive, factory-level data, often surpassing generic aftermarket manuals in detail and accuracy for these specific models.
Instant Access:
Available for immediate download, eliminating waiting times.
No Expiry:
Unlimited access and usability without time limitations or renewal fees.
Professional Resource:
Presents information in a format used by professional mechanics, ensuring clarity and accuracy.
Technical Coverage:
Comprehensive repair, servicing, and troubleshooting for Yamaha DT250 and DT360 motorcycles.
Model Years Covered:
Covers a broad range of DT250 and DT360 models from their respective production eras (specific years should be confirmed with manual content).
Estimated Pages:
Hundreds (actual number not specified, but described as extensive).
Type:
Factory Service Repair Workshop Manual
Engine System:
Engine disassembly, assembly, tuning, troubleshooting, specifications, and component testing for both 2-stroke engines.
Transmission System:
Gearbox inspection, repair, clutch operation, and lubrication.
Fuel System:
Carburetor service, jetting, fuel tank, fuel lines, and petcock operation.
Ignition System:
CDI ignition troubleshooting, spark plug specifications, and timing.
Electrical System:
Lighting, wiring diagrams, battery maintenance, charging system (alternator/stator), and troubleshooting electrical faults.
Chassis Suspension:
Front fork service, rear shock absorber maintenance, swingarm and linkage inspection.
Braking System:
Drum brake and disc brake (if applicable) adjustment, servicing, and inspection.
Wheel Tire Assembly:
Wheel bearing service, spoke tension adjustment, and tire replacement.
Bodywork Frame:
Fender removal/installation, seat, tank, and basic frame inspection.
Exhaust System:
Inspection and maintenance of the 2-stroke expansion chamber and muffler.
Routine Maintenance:
Oil changes, filter replacements, chain adjustment, lubrication points, and spark plug replacement.
Troubleshooting Diagnostics:
Step-by-step guides for identifying and resolving common mechanical and electrical issues.
Engine Rebuild:
Detailed procedures for complete engine disassembly, cleaning, inspection, and reassembly, including piston, rings, and crankshaft.
Carburetor Tuning:
Adjustment of idle speed, mixture, and main jet selection for optimal performance.
Electrical System Repair:
Component testing, wiring repair, and fuse replacement.
Timing Adjustment:
Procedures for checking and adjusting ignition timing for optimal engine performance.
Clutch Adjustment:
Instructions for adjusting clutch lever free play and clutch cable tension.
Shock ABSorber Adjustment:
Guidance on adjusting rear shock pre-load and damping (if applicable).
Wheel Truing:
Information on spoke tensioning and wheel truing for maintaining wheel integrity.
Depth:
Full factory level, suitable for professional mechanics and experienced DIY enthusiasts.
Diagrams Photos:
Hundreds of detailed photos and exploded diagrams illustrating procedures and component placement.
Diagnostic Charts:
Includes symptom-to-cause diagnostic charts for efficient troubleshooting.
Engine Type:
2-Stroke, Air-Cooled, Reed Valve (DT250: single cylinder; DT360: single cylinder)
Bore X Stroke Dt250:
Approx. 66.0 mm x 70.0 mm (specifics may vary slightly by year).
Bore X Stroke Dt360:
Approx. 74.0 mm x 84.0 mm (specifics may vary slightly by year).
Displacement Dt250:
247 cc (cubic centimeters)
Displacement Dt360:
357 cc (cubic centimeters)
Horsepower Dt250:
Typically in the range of 20-25 HP (varies by year and tuning).
Horsepower Dt360:
Typically in the range of 27-30 HP (varies by year and tuning).
Carburetor Type:
Single Mikuni VM Series (specific bore size varies by model/year, e.g., VM30SC for DT250, VM34SC for DT360).
Fuel Type:
Unleaded gasoline with appropriate 2-stroke oil pre-mix ratio (e.g., 20:1 or 25:1, check specific model recommendations).
Two Stroke Oil System:
Autolube system with separate oil injection tank (or manual pre-mix for some variants).
Oil Change Interval:
Refer to manual for specific intervals; typically every 1,000-2,000 miles or annually, depending on usage.
Spark Plug Replacement:
Recommended every 3,000-5,000 miles or as needed based on performance; specific plug types vary.
Transmission Oil Type:
Yamalube 10W-30 or equivalent API SE, SF, SG rated oil (check specific manual for exact viscosity and API rating).
Fork Oil Type:
Yamalube SAE 10W or equivalent (check manual for exact viscosity and volume).
Common Wear Items:
Piston rings, crank seals, clutch plates, and suspension components are common wear items on these vintage 2-stroke machines.
Carburetor Cleaning:
Mikuni carburetors can be prone to gumming up if not used regularly, requiring periodic cleaning and adjustment.
Electrical Connections:
Aging wiring and connectors can lead to intermittent electrical faults, requiring inspection and potentially replacement or cleaning.
Yamaha Offroad:
Yamaha has a strong heritage in off-road motorcycles, with the DT series being pivotal in establishing their reputation for robust and capable machines.
Dt Series Legacy:
The DT series, introduced in the late 1960s, was renowned for its versatility, bridging the gap between on-road and off-road use, often referred to as 'scramblers' or 'enduros'.
Production Period:
The DT250 and DT360 models were produced through the 1970s and into the early 1980s, with various iterations and improvements over the years.
