Then, use the Table of Contents on the first page of the chap- ter to find the ignition coil section. Indicates a procedural sub-step or how to do the work of the procedural step it follows. In most chapters an exploded view illustration of the system components follows the Table of Contents.
Prefixes for Units
Units of Mass
Units of Volume
Units of Force
Units of Length
Units of Torque
Units of Pressure
Units of Speed
Units of Power
Units of Temperature
Periodic Maintenance
The scheduled maintenance must be done in accordance with this chart to keep the motorcycle in good running condition.The initial maintenance is vitally important and must not be neglected.
Periodic Inspection
Periodic Replacement Parts
The following tables list the tightening torque for the major fasteners requiring use of a non-permanent locking agent or silicone sealant etc. The table below, relating tightening torque to thread diameter, lists the basic torque for the bolts and nuts. Use this table for only the bolts and nuts which do not require a specific torque value.
Basic Torque for General Fasteners
Fuel System (DFI)
WARNING
If the throttle grip does not return properly, check the throt- tle cable routing, grip free play, and cable damage. If handlebar movement changes the idle speed, the throttle cables may be improperly adjusted or incorrectly routed or damaged. Open and close the throttle a few times to make sure that the idle speed is within the specified range.
Cooling System
Disconnect the hoses from the separator, and remove the separator [A] from the motorcycle left side. Route the hoses according to Cable, Wire, and Hose Routing section in the Appendix chapter. Check that the hoses are securely connected and water hose clamp screws are tightened correctly.
Engine Top End
Select an optimum shim from the Valve Clearance Ad- justment Charts and replace the shim detached from the motorcycle with the selected one. Apply engine oil to the shim and install it so that the mark [A] on it faces to the valve lifter [B]. This may cause the shim to pop out at high rpm, causing ex- tensive engine damage.
Clutch
Plug the air switching valve hose end [A] with your finger and feel vacuum pulsing in the hose. If there is no leak, check the air switching valve (see Air Switching Valve Test in the Engine Top End chapter). After the adjustment, start the engine and check that the clutch does not slip and that it releases properly.
Wheels/Tires
If roughness, binding or noise is found, remove the front wheel and inspect the wheel bearing (see Front Wheel Removal, Hub Bearing Inspection in the Wheels/Tires chapter). If roughness, binding or noise is found, remove the rear wheel and inspect the wheel bearing (see Rear Wheel Re- moval, Hub Bearing Inspection in the Wheels/Tires chap- ter). Set a dial gauge against the side of the rim, and rotate the rim to measure the axial runout [A].
Drive Train
If the chain is too loose, turn out the right and left chain adjusters [D] evenly. If the chain is too tight, turn in the right and left chain adjusters evenly, and kick the wheel forward. If they do not, adjust the chain slack and align the wheel alignment (see Drive Chain Slack Adjustment).
Brake System
Check that the brake fluid level in the front brake reservoir [A] is above the lower level line [B]. Check that the brake fluid level in the rear brake reservoir [A] is above the lower level line [B]. Remove the brake pads (see Front/Rear Brake Pad Re- moval in the Brakes chapter).
Suspensions
If the rocker arm [A] does not smoothly stroke or noise is found, inspect the fasteners and bearings (see Rocker Arm/Tie-Rod Bearing, Sleeve Inspection in the Suspen- sion chapter). If the tie-rods [A] do not smoothly stroke or noise is found, inspect the fasteners and tie-rod bearings (see Rocker Arm/Tie-Rod Bearing, Sleeve Inspection in the Suspen- sion chapter). Lubricate the tie-rod bearings in the same way as rocker arm bearings (see Rocker Arm Bearing Lubrication).
Steering System
Special Tool - Steering Stem Nut Wrench If the steering is too tight, loosen the stem nut a fraction of a turn. If the rollers or races are worn, or if either race is dented, replace both races and all the bearings as a set. Pack the upper and lower tapered roller bearings in the cages with grease, and apply a light coat of grease to the upper and lower outer races.
Electrical System
If the low beam headlight does not go on, inspect or re- place the following item. If the high beam headlight and/or high beam indicator light does not go on, inspect or replace the following item. If the headlight beam points to one side rather than straight ahead, adjust the horizontal beam.
Others
With the cable disconnected at both ends, the cable should move freely [A] within the cable housing. If cable movement is not free after lubricating, if the cable is frayed [B], or if the cable housing is kinked [C], replace the cable. Also, check to see that each cotter pin is in place and in good condition.
For the engine fasteners, check the tightness of them when the engine is cold (at room temperature). If there are loose fasteners, retighten them to the spec- ified torque following the specified tightening sequence. Engine Mounting Bolt and Nuts Exhaust Pipe Holder Nuts Exhaust Pipe Holder Clamp Bolt Muffler Body Bolts.
Front Fork Clamp Bolts Rear Shock Absorber Bolts Swingarm Pivot Shaft Nut Tie-Rod Nuts.
Replacement Parts
KLX250S9 ∼ SB/V9 ∼ VB AD: Apply adhesive
Output Voltage DC 0.48∼0.52 V at subthrottle valve full close position DC 3.8∼4.0 V at subthrottle valve full open position (for reference).
DFI Servicing Precautions
To maintain the correct fuel/air mixture (F/A), there must be no inlet air leaks in the DFI system. With the engine stopped and turned in the self-diagnosis mode, the service code [A] is indicated by the number of times the FI indicator LED light blinks. Even when the DFI system is operating normally, the FI indicator LED light [A] may light up under strong electrical interference.
When the FI indicator LED light goes on and the motor- cycle is brought in for repair, check the service codes. When checking the DFI parts, use a digital meter which can be read two decimal place voltage or resistance. Be careful not to short-circuit the leads of the DFI or elec- trical system parts by contact between adapters.
Incorrect, reverse connection or short circuit by needle adapters could damage the DFI or electrical system parts. Deteriorated leads and bad connections can cause reappearance of problems and unstable operation of the DFI system. If no abnormality is found in the wiring or connectors, the DFI parts are the next likely suspects.
If no abnormality is found in the wiring, connectors, and DFI parts, replace the ECU.
Inquiries to Rider
Sample Diagnosis Sheet
If these parts and circuits are checked out good, be sure to check the ECU for ground and power supply.
Engine Won’t Turn Over
Poor Running at Low Speed
Symptoms or Possible Causes Actions (chapter) Spark plug dirty, broken or gap maladjusted Inspect and replace (see chapter 16). Unstable fuel pressure Fuel pressure regulator trouble (Inspect and replace fuel pump) or kinked fuel line (Inspect and replace fuel pump) (see chapter 3).
Poor Running or No Power at High Speed
ECU 2. Meter Unit
The ECU senses this change, and stops the fuel pump relay, the fuel injectors and the ignition system. To start the engine again, raise the motorcycle, turn the ignition switch OFF, and then ON. Disconnect the vehicle-down sensor connector and con- nect the harness adapter [A] between these connectors as shown.
If the reading is within the standard, check the output volt- age (see Vehicle-down Sensor Output Voltage Inspec- tion). If the reading is out of the standard, remove the ECU and check the wiring for continuity between main harness connectors. If the wiring is good, check the ECU for its ground and power supply (see ECU Power Supply Inspection).
If the ground and power supply are good, replace the ECU (see ECU Removal/Installation). Tilt the sensor 60∼70° or more [A] right or left, then hold the sensor almost vertical with the arrow mark pointed up [B], and measure the output voltage. If the reading is within the standard, remove the ECU and check the wiring for continuity between main harness con- nectors.
If the ground and power supply are good, replace the ECU (see ECU Removal/Installation).
IN and MY Models)
Be sure to place a piece of cloth around the fuel outlet pipe of the fuel pump and the delivery pipe of the throttle body assy. Do not drive the fuel pump 3 seconds or more with- out the fuel in the fuel tank. Be sure to place a piece of cloth around the fuel outlet pipe of the fuel pump.
Do not drive the fuel pump 2 seconds or more with- out the fuel in the fuel tank. If the fuel flow is much less than the specified, replace the fuel pump (see Fuel Pump Removal/Installation). Disconnect the fuel pump lead connector [A] and con- nect the harness adapter [A] between these connectors as shown.
If the reading stays on battery voltage and never shows 0 V, check the fuel pump relay (see Fuel Pump Relay Inspection). If there is still no battery voltage, check the fuel pump relay (see Fuel Pump Relay Inspection). If the fuel pump relay is normal, check the wiring for con- tinuity (see Fuel Pump Circuit).
If the reading is in specification, but the fuel pump does not operate, replace the fuel pump (see Fuel Pump Re- moval/Installation).
