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General| Displacement | 89cc |
|---|---|
| Ignition | CDI |
| Final Drive | Chain |
| Fuel System | Carburetor |
| Transmission | 3-speed |
| Front Suspension | Telescopic fork |
| Front Brake | Drum |
| Rear Brake | Drum brake |
| Seat Height | 25.0 in |
| Engine Type | Air-cooled, 4-stroke, SOHC, 2-valve |
| Fuel Capacity | 1.0 gal |
| Curb Weight | 68 kg (150 lb) |
Identifies key components of the motorcycle, including controls and parts.
Location and importance of the VIN for identification and ordering parts.
Location of the engine serial number for identification and parts ordering.
Location of the model label for spare parts identification.
Steps for preparing the machine before disassembly, including cleaning and tool usage.
Recommendation to use genuine Yamaha parts and recommended oils/greases for assembly.
Location and function of the engine stop switch for safety.
Location and operation of the throttle grip for acceleration and deceleration.
Procedure for breaking in the engine to ensure longevity and performance.
Overall dimensions, weight, engine type, and basic specifications of the TTR90M.
Detailed standard and limit specifications for engine components.
Standard and limit specifications for chassis components like suspension and wheels.
Specifications for electrical system components like ignition and CDI.
Standard torque values for common fasteners used in assembly and repair.
Maintenance specifications for engine parts, including cylinder head and camshaft.
Maintenance specifications for clutch components.
Maintenance specifications for chassis components like frame, wheels, and suspension.
Maintenance specifications for electrical system components like ignition and CDI.
Recommended schedule for routine maintenance tasks based on time intervals.
Details on periodic maintenance and lubrication points for the machine.
Procedure for checking and adjusting the throttle cable free play.
Steps for cleaning and maintaining the air filter element.
Procedure for checking the engine oil level using the dipstick.
Procedure for checking and adjusting valve clearance when the engine is cool.
Steps for adjusting the front brake lever free play.
Steps for adjusting the rear brake pedal free play.
Procedure for inspecting the front fork for smooth action and leaks.
Procedure for inspecting the rear shock absorber for smooth action and leaks.
Steps for inspecting and adjusting the steering head for smooth operation.
Procedure for inspecting the spark plug condition, gap, and color.
Procedure for inspecting the continuity of the engine stop switch.
Step-by-step instructions for disassembling the carburetor.
General inspection of the carburetor body and components.
Inspection procedure for the needle valve and seat.
Steps for removing the cylinder head assembly.
Procedure for measuring camshaft lobe length.
Steps for applying lubricant and installing the camshaft.
Instructions for removing valve cotters using a spring compressor.
Procedure for measuring valve stem-to-guide clearance and runout.
Steps for removing piston pin clips, pin, and piston from the cylinder.
Procedure for inspecting cylinder and piston walls and measuring clearance.
Steps for removing the left and right crankcase covers.
Steps for removing the clutch boss nut, lock washer, and clutch boss.
Procedure for measuring friction plate thickness.
Steps for removing and disassembling the kick axle assembly.
Steps for removing the shift shaft and related components.
Steps for removing and disassembling the oil pump assembly.
Steps for removing the CDI magneto and stator assembly.
Steps for separating crankcases and removing the crankshaft.
Steps for removing shift forks, shift cam, and transmission components.
Procedures for removing and disassembling the front and rear wheels.
Steps for removing and disassembling the front wheel and brake components.
Procedure for measuring wheel runout.
Inspection and measurement of brake shoe lining thickness.
Steps for removing the front fork assembly.
Steps for removing the handlebar and related components.
Steps for removing the steering head components.
Steps for removing the swingarm and related components.
List of electrical components with color codes.
Diagram showing the electrical wiring layout and connections.
Diagnostic steps for checking ignition system failures and spark plug issues.
Procedure for inspecting the primary and secondary coil resistance.
Procedure for inspecting the pickup coil resistance.
Diagnostic steps for checking the carburetor heating system's functionality.
Procedure for inspecting the carburetor heater resistance.
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