Yamaha YZ250(V), Owner'S Service Manual

Page: 534 / 596

6-12
TPS (THROTTLE POSITION SENSOR) SYSTEM
ELEC
4. Install:
9 TPS
1
9 Screw (TPS)
2
NOTE:
9 Align the slot
a
in the TPS with the projection
b
on the carburetor while the lever
3
is held
down.
9 Temporarily tighten the screws (TPS).
5. Install:
9 Mixing chamber top
9 Carburetor
Refer to “CARBURETOR AND REED
VALVE” section in the CHAPTER 4.
6. Adjust:
9
Idle speed for TPS adjustment
Idle speed for TPS adjustment:
1,700~1,900 rpm
Adjustment steps:
9 Set the inductive tachometer (engine
tachometer) to the high tension cord.
9
Turn the throttle stop screw
1
until the
specified idle speed.
Refer to “IDLE SPEED ADJUSTMENT” sec-
tion in the CHAPTER 3.
7. Insert the thin electric conductors
2
(lead
wire) into the TPS coupler
1
, as shown,
and connect the tester to them.
c C
9
Do not insert the electric conductors
more than required because it may reduce
the waterproof function of the coupler.
9 Make sure that a short-circuit does not
develop between the terminals because it
may cause damage to electrical compo-
nents.
Tester (+) lead
→
Yellow
lead
3
Tester (–) lead
→
Black
lead
4
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