Carburetor Access/Air Cut Valve; Air Induction System Reed Valve; Co Adjustment/Air Induction System Check Procedure; V-Belt Transmissions Air Filters/Headlight Bulb Access/Taillight And Rear Turn Signal Bulb Access - Yamaha XP500 TMax Technical Manual

CARBURETOR ACCESS
Carburetor adjustment is easily accessible through the center of the floorboard. The vacuum plugs
for carburetor synchronization are on the intake manifolds and the fuel mixture screws for CO
adjustment are on the top of carburetors.
AIR CUT VALVE
The Air Cut Valve for the Air Induction System is located under the windshield on the left side of
the air box.

AIR INDUCTION SYSTEM REED VALVE

When performing the CO adjustment, be sure to block off the large hose to the reed valve located
under the left floorboard. This will prevent air from entering the system and giving inaccurate readings.
CO ADJUSTMENT / AIR INDUCTION SYSTEM CHECK PROCEDURE
CO ADJUSTMENT
1 Cut the secondary air supply by blocking the hose between the Air Cut Valve and the Reed Valve
(See pg.16 for Illustration)
2 Connect the exhaust gas analyzer to the head pipe fittings.
3 Disconnect the crankcase breather hose. This will prevent any oil contamination or combustion
blow-by from affecting the EGA readings.
4 Warm up the engine for several minutes at idle rpm.
5 Adjust the CO while maintaining the following conditions::
n Oil temperature
n Coolant temperature
n Intake vacuum
n Idle revolution
CO measurement should be: 3.0%
AIR INDUCTION SYSTEM CHECK PROCEDURE
1 Adjust CO following the above procedure.
2 Restore the secondary air supply to the air induction system unit.
3 Check the CO reading while maintaining the above conditions (oil temperature, coolant tempera -
ture , intake vacuum and idle rpm).
4 CO reading should be: 0.5%
: Reconnect the crankcase breather hose and check the CO reading again. If the CO level is much
NOTE
higher, the engine oil may be contaminated with gasoline or the engine may be suffering from poor
mechanical condition. Change the engine oil and check the CO level again. If the reading is still out of
specification, check the engine for a mechanical problem.
V-BELT TRANSMISSION AIR FILTERS
One of the V-belt transmission air filters is located under the left side panel next to the fuel tank and the
other one is inside the right crankcase cover in front of the secondary sheave.
HEADLIGHT BULB ACCESS
The head light bulbs can be accessed by reaching up under the front cowling.
TAILLIGHT AND REAR TURN SIGNAL BULB ACCESS
The taillight and turn signal bulbs can be accessed after removing the aluminium grab rail, middle and side
sections of the tail cowl.
XP500 TMax Technical Orientation Guide
.
: 65 ~ 75 ºC
: 75 ~ 85 ºC
: 33 ~ 39 kPa
: 1150 ~ 1250 rpm.
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