Checking Tdc And Cam Timing Position; Valve Adjustment Precaution; Reset Engine Oil Change Indicator; Self-Diagnostics - Yamaha XP500 TMax Technical Manual

CHECKING TDC AND CAM TIMING POSITION

n Remove the left and right floorboards as shown earlier.
n Remove the valve cover according to the service manual.
n Remove the inspection plug on the left crankcase cover just above the water pump.
n Remove the small cover on the front of the right side crankcase cover to access the primary
sheave nut.
n Rotate the primary sheave nut clockwise until the TDC mark on the rotor is aligned with the
mark in the inspection window. The number one cylinder will also be at TDC of its compression stroke
when the small holes on both camshaft sprockets are even with the cylinder head surface and facing
towards the intake side of the engine.

VALVE ADJUSTMENT PRECAUTION

Because of the near horizontal angle of the cylinder head, the exhaust valve lifters may have a tendency to
slide out of their pockets when the cams are removed. If this occurs the adjustment shim may fall out of the
valve retainer and damage the cylinder head if the engine is run in this condition.
To prevent this from happening, apply a small amount of grease to the adjusting shim and the valve
lifter before reassembly. This will hold the shim and lifter in place while the cams are reinstalled
and timed.

RESET ENGINE OIL CHANGE INDICATOR

To reset the engine oil indicator, push the oil indicator reset button on the instrument panel for 2 - 5
seconds. The required reset time is to prevent accidentally resetting the oil change indicator (i.e. the
counter in the igniter-unit). See also Self-diagnostics.

SELF-DIAGNOSTICS

The oil indicator light of the TMax has 3 functions:
n Oil indicator bulb check
n Indicate replacement timing of engine oil
n Indicate an electrical problem (self-diagnostics).
Function 1
The oil indicator lights up momentarily when the main switch is turned on, in order to indicate that the oil
indicator light bulb is working properly.
Function 2
The oil indicator lights up continuously in order to indicate that the engine oil has to be replaced.
It lights up initially at 1,000 km and 5,000 km, after that it lights up every 5,000 km (10,000 -
15,000 - etc.).
NOTE:
The mileage is counted by the igniter after every reset, it therefore is possible that the timing of the
light is different from the odometer reading.
XP500 TMax Technical Orientation Guide
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