YFM350XP

SUPPLEMENTARY
SERVICE MANUAL
LIT-11616-15-09 3GD-28197-16
 FOREWORD

This Supplementary Service Manual has been prepared to introduce new service and new data for
the YFM350XP. For complete information on service procedures, it is necessary to use this Supple-
mentary Service Manual together with the following manual.

YFM350XA SERVICE MANUAL: 3GD-28197-12

YFM350XE SUPPLEMENTARY SERVICE MANUAL: 3GD-28197-13
YFM350XJ SUPPLEMENTARY SERVICE MANUAL: 3GD-28197-14
YFM350XKC (for California) SUPPLEMENTARY SERVICE MANUAL: 3GD-28197-15

YFM350XP
SUPPLEMENTARY
SERVICE MANUAL
 2001 by Yamaha Motor Corporation, U.S.A.
First Edition, May 2001
All rights reserved.
Any reproduction or unauthorized use
without the written permission of
Yamaha Motor Corporation, U.S.A.
is expressly prohibited.
Printed in U.S.A.
LIT-11616-15-09
EB001000

NOTICE
This manual was produced by the Yamaha Motor Company primarily for use by Yamaha dealers
and their qualified mechanics. It is not possible to include all the knowledge of a mechanic in one
manual, so it is assumed that anyone who uses this book to perform maintenance and repairs on
Yamaha machine has a basic understanding of the mechanical ideas and the procedures of
machine repair. Repairs attempted by anyone without this knowledge are likely to render the
machine unsafe and unfit for use.
Yamaha Motor Company, Ltd. is continually striving to improve all its models. Modifications and sig-
nificant changes in specifications or procedures will be forwarded to all authorized Yamaha dealers
and will appear in future editions of this manual where applicable.

NOTE:
Designs and specifications are subject to change without notice.

IMPORTANT INFORMATION
Particularly important information is distinguished in this manual by the following notations.
The Safety Alert Symbol means ATTENTION! BECOME ALERT! YOUR
SAFETY IS INVOLVED!
WARNING Failure to follow WARNING instructions could result in severe injury or death
to the machine operator, a bystander or a person inspecting or repairing the
machine.
CAUTION: A CAUTION indicates special precautions that must be taken to avoid dam-
age to the machine.
NOTE: A NOTE provides key information to make procedures easier or clearer.
 HOW TO USE THIS MANUAL
CONSTRUCTION OF THIS MANUAL
This manual consists of chapters for the main categories of subjects. (See “Illustrated symbols”)
1st title 1: This is a chapter with its symbol on the upper right of each page.
2nd title 2: This title appears on the upper of each page on the left of the chapter sym-
bol. (For the chapter “Periodic inspection and adjustment” the 3rd title
appears.)
3rd title 3: This is a final title.
MANUAL FORMAT
All of the procedures in this manual are organized in a sequential, step-by-step format. The informa-
tion has been compiled to provide the mechanic with an easy to read, handy reference that contains
comprehensive explanations of all disassembly, repair, assembly, and inspections.
A set of particularly important procedure 4 is placed between a line of asterisks “*” with each proce-
dure preceded by “●”.
IMPORTANT FEATURES
● Data and a special tool are framed in a box preceded by a relevant symbol 5.

● An encircled numeral 6 indicates a part name, and an encircled alphabetical letter data or an

alignment mark 7, the others being indicated by an alphabetical letter in a box 8.

● A condition of a faulty component will precede an arrow symbol 9 and the course of action will fol-

low it.
EXPLODED DIAGRAM
Each chapter provides exploded diagrams before each disassembly section for ease in identifying
correct disassembly and assembly procedures.
 EB003000
1 2
ILLUSTRATED SYMBOLS
GEN Illustrated symbols 1 to 9 are printed on the
INFO SPEC top right of each page and indicate the subject
of each chapter.
3 4
1 General information
2 Specifications
CHK 3 Periodic checks and adjustments
ADJ ENG 4 Engine
5 Carburetion
5 6
6 Drive train
7 Chassis
8 Electrical
CARB DRIV 9 Troubleshooting

7 8

– +
CHAS ELEC
9 0 Illustrated symbols 0 to F are used to identify
the specifications appearing in the text.
TRBL 0 Filling fluid
SHTG A Lubricant
B Special tool
A B C Torque
D Wear limit, clearance
E Engine speed
F Ω, V, A

C D
T.
R.

E F

Illustrated symbols G to M in the exploded

G H I
diagrams indicate the types of lubricants and
lubrication points.
E G M G Apply engine oil
H Apply gear oil
J K L M I Apply molybdenum disulfide oil
J Apply wheel bearing grease
B LS M S K Apply lightweight lithium soap base grease
L Apply molybdenum disulfide grease
M Apply silicon grease
N O Illustrated symbols N to O in the exploded
diagrams indicate where to apply a locking

LT
New agent N and when to install a new part O.
N Apply the locking agent (LOCTITE)
O Replace
 CONTENTS

SPECIFICATIONS ........................................................................................... 1
GENERAL SPECIFICATIONS ................................................................. 1
MAINTENANCE SPECIFICATIONS ........................................................ 2
ENGINE ................................................................................................ 2
CHASSIS .............................................................................................. 4
ELECTRICAL ....................................................................................... 4
CABLE ROUTING .................................................................................... 5

PERIODIC CHECKS AND ADJUSTMENTS ................................................... 9

INTRODUCTION ...................................................................................... 9
PERIODIC MAINTENANCE/LUBRICATION INTERVALS ....................... 9
CHASSIS ................................................................................................ 11
ADJUSTING THE FRONT BRAKE .................................................... 11
ADJUSTING THE REAR BRAKE LIGHT SWITCH ............................ 11

CHASSIS ....................................................................................................... 12
FRONT SUSPENSION ........................................................................... 12

ELECTRICAL ................................................................................................. 13
CHECKING THE SWITCH ..................................................................... 13
CHECKING THE SWITCH ................................................................. 13
CHECKING A SWITCH SHOWN IN THE MANUAL .......................... 13
IGNITION SYSTEM ................................................................................ 14
CIRCUIT DIAGRAM ........................................................................... 14
TROUBLESHOOTING ....................................................................... 15
SIGNAL SYSTEM ................................................................................... 20
CIRCUIT DIAGRAM ........................................................................... 20
CHECKING THE SIGNAL SYSTEM .................................................. 21

YFM350XP WIRING DIAGRAM

 GENERAL SPECIFICATIONS SPEC
SPECIFICATIONS
GENERAL SPECIFICATIONS
Model YFM350XP
Model code number: 5NF4 (except for California)
5NF5 (for California)
Spark plug:
Type/manufacturer DR8EA (NGK)
Gap 0.6 ~ 0.7 mm (0.024 ~ 0.028 in)
Electrical:
Ignition system DC. C.D.I.
Charging system A.C. magneto
Battery capacity 12 V 12AH
Battery type GM12CZ-4A-2
Bulb wattage × quantity:
Headlight 12 V 30 W/30 W × 2
Tail/brake light 12 V 5 W/21 W × 1
Neutral indicator light 12 V 3.4 W × 1
Reverse indicator light 12 V 3.4 W × 1

–1–
 MAINTENANCE SPECIFICATIONS SPEC
MAINTENANCE SPECIFICATIONS
ENGINE

Model YFM350XP
Cylinder:
Bore size 82.97 ~ 83.02 mm (3.267 ~ 3.269 in)
Taper limit <0.05 mm (0.002 in)>
Piston:
Piston size “D” 82.92 ~ 82.97 mm (3.265 ~ 3.267 in)
Measuring point “H” 5.5 mm (0.22 in)
(From bottom line of piston skirts)
Piston clearance 0.040 ~ 0.060 mm
(0.00157 ~ 0.00236 in)
Oversize 2nd H 83.5 mm (3.287 in)
4th D 84.0 mm (3.307 in)
Piston off-set 0.5 mm (0.02 in)
Piston off-set direction Intake side
Inside diameter (piston pin bore) 19.004 ~ 19.015 mm (0.7481 ~ 0.7486 in)
Outside diameter (piston pin) 18.991 ~ 19.000 mm (0.7477 ~ 0.7480 in)
Piston ring:
Sectional sketch
Top ring: Barrel
B
B 1.2 mm (0.047 in)
T T 3.3 mm (0.130 in)
2nd ring: Tapper
B
B 1.5 mm (0.059 in)
T
T 3.4 mm (0.134 in)
Oil ring: B 2.8 mm (0.110 in)
B
T 2.8 mm (0.110 in)
T
End gap (installed)
Top ring 0.20 ~ 0.40 mm (0.00787 ~ 0.0157 in)
2nd ring 0.20 ~ 0.40 mm (0.00787 ~ 0.0157 in)
Oil ring 0.30 ~ 0.90 mm (0.012 ~ 0.035 in)
Side clearance Top ring 0.03 ~ 0.09 mm (0.0012 ~ 0.0035 in)
2nd ring 0.03 ~ 0.07 mm (0.0012 ~ 0.0028 in)
Clutch:
Friction plate thickness/quantity 2.74 ~ 2.86 mm (0.107 ~ 0.113 in)/6
Warp limit <2.64 mm (0.104 in)>
Friction plate thickness/quantity 2.94 ~ 3.06 mm (0.116 ~ 0.120 in)/1
Warp limit <2.84 mm (0.112 in)>
Clutch plate thickness/quantity 1.5 ~ 1.7 mm (0.059 ~ 0.066 in)/4
1.9 ~ 2.1 mm (0.0748 ~ 0.0827 in)/2
Max. warpage <0.2 mm (0.00787 in)>
Clutch spring free length/quantity 47.8 mm (1.882 in)/5
Clutch spring minimum free length 46.5 mm (1.831 in)
Clutch release method Outer push (rack and pinon)

–2–
 MAINTENANCE SPECIFICATIONS SPEC
Model YFM350XP
Carburetor:
I. D. mark 3GD 00 (except for California)
3GD 10 (for California)
Main jet (M.J) #145
Main air jet (M.A.J) 0.6
Jet needle (J.N) 5J18-3 (except for California)
5J31-1 (except for California)
Needle jet (N.J) O-6 (except for California)
O-6M (for California)
Pilot jet (P.J) #42.5
Pilot air jet (P.A.J.1) 1.0
(P.A.J.2) 0.7
Pilot outlet (P.O) 0.75
Bypass 1 (B.P.1) 0.8
Bypass 2 (B.P.2) 0.8
Bypass 3 (B.P.3) 0.8
Valve seat (V.S) 2.5
Starter jet (G.S.) #62.5
Throttle valve size (Th.V) #125
Fuel level (F.L) 2 ~ 3 mm (0.08 ~ 0.12 in)
Float height 11.4 ~ 13.4 mm (0.45 ~ 0.53 in)
Engine idling speed 1,450 ~ 1,550 r/min
Intake vacuum 33.3 kPa (250 mmHg, 9.83 inHg)

–3–
 MAINTENANCE SPECIFICATIONS SPEC
CHASSIS

Model YFM350XP
Brake lever and brake pedal:
Brake lever free play 0 mm (0 in) at lever end
Brake pedal position 10 mm (0.4 in)
Brake pedal free play 8 mm (0.315 in)
ELECTRICAL

Model YFM350XP
C.D.I.:
Magneto model/manufacturer F4T466/MITSUBISHI
Pickup coil resistance 459 ~ 561 Ω at 20 °C (68 °F)
(Color) (White/Red-White/Green)
Rotor rotation direction detection coil resis- 0.083 ~ 0.101 Ω at 20 °C (68 °F)
tance
(Color) (Red-White/Blue)
C.D.I. unit-model/manufacturer F8T38675/MITSUBISHI
Ignition coil:
Model/manufacturer 2JN/YAMAHA
Minimum spark gap 6 mm (0.24 in)
Primary winding resistance 0.18 ~ 0.28 Ω at 20 °C (68 °F)
Secondary winding resistance 6.32 ~ 9.48 kΩ at 20 °C (68 °F)
Charging system:
Model/manufacturer F4T466/MITSUBISHI
Nominal output 14 V 15 A at 5,000 r/min
Charging coil resistance/color 0.51 ~ 0.63 Ω at 20 °C (68 °F)/White-White
0.47 ~ 0.57 Ω at 20 °C (68 °F)/White-White
Rectifier/regulator:
Regulator type Semi conductor-short circuit
Model/manufacturer SH640-11/SHINDENGEN
No load regulated voltage 14.1 ~ 14.9 V
Rectifier capacity 14 A
Withstand voltage 200 V
Starter relay:
Model/manufacturer MS5D-611/JIDECO
Amperage rating 100 A
Coil winding resistance 3.9 ~ 4.7 Ω

–4–
 CABLE ROUTING SPEC
CABLE ROUTING
1 Clutch switch È Install the fuel tank breather hose into the hole of
2 Rear brake cable the handlebar cover.
3 Clutch cable
4 Front brake hose
5 Front brake light switch
6 Throttle cable
7 Band

–5–
 CABLE ROUTING SPEC
1 Main switch lead
2 Handlebar switch lead
3 Clutch switch lead
4 Park switch lead
5 Front brake light switch lead
6 Fuel tank breather hose

–6–
 CABLE ROUTING SPEC
1 Starter relay È Pass the battery breather hose through the inside
2 Neutral relay of the frame bracket.
3 Tail/brake light É Pass the battery breather hose through the guide.
4 CDI unit
5 Rectifier/regulator
6 Fuse
7 Battery breather hose

–7 –
 CABLE ROUTING SPEC
1 Battery negative lead È Pass the wire harness and starter motor lead
2 Rear brake light switch through the holder.
3 Drive select lever switch É Fasten the wire harness, starter motor lead and
4 Rear brake cable handlebar switch lead with the band.
5 Rear brake hose
6 Rectifier/regulator
7 CDI unit
8 Carburetor overflow hose
9 Rear brake light switch lead

–8–
 INTRODUCTION/ CHK
PERIODIC MAINTENANCE/LUBRICATION INTERVALS ADJ
EB300000

PERIODIC CHECKS AND ADJUSTMENTS

INTRODUCTION
This chapter includes all information necessary to perform recommended inspections and adjust-
ments. These preventive maintenance procedures, if followed, will ensure more reliable vehicle
operation and a longer service life. The need for costly overhaul work will be greatly reduced. This
information applies to vehicles already in service as well as to new vehicles that are being prepared
for sale. All service technicians should be familiar with this entire chapter.
EB301000

PERIODIC MAINTENANCE/LUBRICATION INTERVALS

INITIAL EVERY
ITEM ROUTINE 1 3 6 6 1
month months months months year
• Check valve clearance.
Valves*
• Adjust if necessary.
• Check condition.
Spark plug • Adjust gap and clean.
• Replace if necessary.
• Clean. Every 20~40 hours
Air filter
• Replace if necessary. (More often in wet or dusty areas.)
• Check idle speed/starter operation.
Carburetor*
• Adjust if necessary.
Crankcase breather • Check breather hose for cracks or damage.
system* • Replace if necessary.
• Check for leakage.
Exhaust system* • Tighten if necessary.
• Replace gasket(s) if necessary.
Spark arrester • Clean.
• Check fuel hose for cracks or damage.
Fuel line*
• Replace if necessary.
Engine oil • Replace (Warm engine before draining).
Engine oil filter ele- • Clean.
ment • Replace if necessary.
Engine oil strainer • Clean.
Drive chain • Check and adjust slack/alignment/clean/lube.
• Check operation/fluid leakage/See NOTE Page 10.
Brake*
• Correct if necessary.
• Check operation.
Clutch*
• Adjust if necessary.
• Check balance/damage/runout.
Wheels*
• Replace if necessary.
• Check bearing assembly for looseness/damage.
Wheel bearings*
• Replace if damaged.
• Check operation.
• Repair if damaged.
Steering system*
• Check toe-in.
• Adjust if necessary.
Upper and lower arm
pivot and steering • Lubricate every 6 months.**
shaft*
Rear arm pivot* • Lubricate every 6 months.**
Fittings and • Check all chassis fittings and fasteners.
Fasteners* • Correct if necessary.
• Check specific gravity.
Battery* • Check breather pipe for proper routing.
• Correct if necessary.

* It is recommended that these items be serviced by a Yamaha dealer.

** Lithium-soap-based grease

–9–
 CHK
PERIODIC MAINTENANCE/LUBRICATION INTERVALS ADJ
NOTE:
● Recommended brake fluid: DOT4

● Brake fluid replacement:

1.When disassembling the master cylinder or caliper, replace the brake fluid. Normally check the
brake fluid level and add fluid as required.
2.On the inner parts of the master cylinder and caliper, replace the oil seals every two years.
3.Replace the brake hoses every four years, or if cracked or damaged.

– 10 –
 ADJUSTING THE FRONT BRAKE/ CHK
ADJUSTING THE REAR BRAKE LIGHT SWITCH ADJ
CHASSIS
ADJUSTING THE FRONT BRAKE
1.Check:
● Brake lever free play a

Out of specification → Bleed the front brake

system.
Refer to “AIR BLEEDING (HYDRAULIC
BRAKE SYSTEM)” in CHAPTER 3. (Manual
No.: 3GD-28197-12)

Brake lever free play (at brake

lever end):
0 mm (0 in)

ADJUSTING THE REAR BRAKE LIGHT

SWITCH
NOTE:
The rear brake light switch is operated by
movement of the brake pedal.
The rear brake light switch is properly adjusted
when the brake light comes on just before the
braking effect starts.

1.Check:
● Rear brake light operation timing

Incorrect → Adjust.
2.Adjust:
● Rear brake light operation timing

***********************************************
● Hold the main body 1 of the rear brake light
switch so that it does not rotate and turn the
adjusting nut 2 in direction a or b until the
rear brake light comes on at the proper time.

Brake light comes on

Direction a
sooner.
Brake light comes on
Direction b
later.

***********************************************

– 11 –
 FRONT SUSPENSION CHAS
CHASSIS
FRONT SUSPENSION
1 Thrust cover
2 Bushing
3 Front upper arm
4 Collar
5 Front lower arm
6 Shock absorber
7 Steering knuckle

– 12 –
 – +
CHECKING THE SWITCH ELEC
ELECTRICAL
CHECKING THE SWITCH
CHECKING THE SWITCH
Use a pocket tester to check the terminals for
continuity. If the continuity is faulty at any
point, replace the switch.

Pocket tester:
P/N. YU-03112, 90890-03112

NOTE:
● Set the pocket tester to “0” before starting

the test.
● The pocket tester should be set to the “Ω × 1”

range when testing the switch for continuity.

● Turn the switch on and off a few times when

checking it.

CHECKING A SWITCH SHOWN IN THE

MANUAL
The terminal connections for switches (main
switch, handlebar switch, engine stop switch,
light switch, etc.) are shown in a chart similar
to the one on the left.
This chart shows the switch positions in the
column and the switch lead colors in the top
row.
For each switch position, “ ” indicates
the terminals with continuity.
The example chart shows that:
1 There is continuity between the “Red and
Brown” leads when the switch is set to “ON”.

– 13 –
 R R
EB802000

1 W/R W/R O O
0
W/G W/G A
W/G B
R/B L/W O B
W
R W/G W/G R
R W/R W/G
W W
W/L W/R W/R W/G

4
W W W
R/W R/W G/Y
G/Y G/W
W
W/B B/Y G/Y
W W
CIRCUIT DIAGRAM

R R/W
W W W R
L/W
L/W B
3 9
R/B
IGNITION SYSTEM

6 B B G/Y B
ON R R
W/B
2 OFF R
R Br Br R L/W L/W G/W B

R R/W R/W B/Y

R B
(GRAY) (GRAY) 5
W W W Br
B B

(GRAY)
R/W
B B
8
B 7
B R
B
W W W

(GRAY) B B

– 14 –
G/W Sb

Br W/B
Br Br

M Br R/B R/W Br Br W/B Br (GREEN)

L R/B R/B L C
R/W Br Br R/W N O P J I G F
OFF OFF OFF B B B B
LO ON PUSH
Y G G Y HI (BLACK) (BLACK) Sb G/W
B B Y Y
Y Br Y Br
G/L Sb

L G Y B (BLACK) (BLACK) Sb G/W

IGNITION SYSTEM

L Y G/W
1 AC magneto
G Y G Y H
G/W
3 Main switch
L L E D 4 Fuse
G Y Y G Y G G Y

B B B B
K 5 Battery
ELEC

9 CDI unit
B B
0 Ignition coil
–

B
A Spark plug
O Engine stop switch
+
 – +
IGNITION SYSTEM ELEC
EB802010
TROUBLESHOOTING

IF THE IGNITION SYSTEM FAILS TO OPERATE (NO SPARK OR INTERMITTENT SPARK):

Procedure
Check:
1.Fuse 7.Engine stop switch
2.Battery 8.Main switch
3.Spark plug 9.Pickup coil resistance
4.Ignition spark gap 10.Charging/rotor rotation direction detection
5.Spark plug cap resistance coil resistance
6.Ignition coil resistance 11.Wiring connection (the entire ignition sys-
tem)

NOTE:
● Remove the following part(s) before trouble-
Dynamic spark tester:
P/N. YM-34487
shooting: Ignition checker:
1)Seat P/N. 90890-06754
2)Front fender Pocket tester:
● Use the following special tool(s) for trouble- P/N. YU-03112, 90890-03112
shooting.

EB802011
NO CONTINUITY
1.Fuse
Refer to “CHECKING THE SWITCH”.

CONTINUITY Replace the fuse.

EB802012

2.Battery
INCORRECT
● Check the battery condition.
Refer to “BATTERY INSPECTION” in
CHAPTER 3. (Manual No.: 3GD-28197-12)
Open-circuit voltage: ● Refill with battery fluid.
12.8 V or more at 20 °C (68 °F) ● Clean the battery terminals.
● Recharge or replace the battery.
CORRECT

3.Spark plug Standard spark plug:

DR8EA
● Check the spark plug condition.
● Check the spark plug type.
● Check the spark plug gap.
Refer to “SPARK PLUG INSPECTION” in
CHAPTER 3. (Manual No.: 3GD-28197-12)

–15 –
 – +
IGNITION SYSTEM ELEC
INCORRECT
Spark plug gap:
0.8 ~ 0.9 mm (0.031 ~ 0.035 in)

CORRECT
Repair or replace the spark plug.

For USA and CDN

4.Ignition spark gap
● Disconnect the spark plug cap from the
spark plug.
● Connect the dynamic spark tester 1 as
shown.
2 Spark plug cap
3 Spark plug
● Turn the main switch to “ON”.
● Check the ignition spark gap.
● Crank the engine by pushing the starter MEETS SPECIFICATION
switch, and increase the spark gap until a
misfiring occurs.
Minimum spark gap:
6.0 mm (0.24 in) The ignition system is not faulty.

For Europe and Oceania

4.Ignition spark gap
● Disconnect the spark plug cap from the
spark plug.
● Connect the dynamic spark tester 1 as
shown.
2 Spark plug cap
● Turn the main switch to “ON”.
● Check the ignition spark gap a.
● Crank the engine by pushing the starter
switch, and increase the spark gap until a MEETS SPECIFICATION
misfiring occurs.
Minimum spark gap:
6.0 mm (0.24 in)
The ignition system is not faulty.
OUT OF
SPECIFICATION
OR NO SPARK
*

– 16 –
 – +
IGNITION SYSTEM ELEC
*

5.Spark plug cap resistance

● Remove the spark plug cap.
● Connect the pocket tester (Ω × 1k) to the
spark plug cap.

● Check that the spark plug cap has the OUT OF SPECIFICATION
specified resistance.

Spark plug cap resistance:

10 kΩ at 20 °C (68 °F) Replace the spark plug cap.
MEETS
SPECIFICATION

6.Ignition coil resistance

● Disconnect the ignition coil connector from
the wire harness.
● Connect the pocket tester (Ω × 1) to the
ignition coil.
Tester (+) lead → Orange lead terminal
Tester (–) lead → Ignition coil base
● Check that the primary coil has the speci-
fied resistance.

Primary coil resistance:

0.18 ~ 0.28 Ω at 20 °C (68 °F)

– 17 –
 – +
IGNITION SYSTEM ELEC
● Connect the pocket tester (Ω × 1k) to the
ignition coil.

Tester (+) lead → Orange lead terminal

Tester (–) lead → Spark plug lead
● Check that the secondary coil has the
specified resistance.

Secondary coil resistance:

6.32 ~ 9.48 kΩ at 20 °C (68 °F)

BOTH MEET
SPECIFICATION

Replace the ignition coil.

INCORRECT
7.Engine stop switch
Refer to “CHECKING THE SWITCH”.

CORRECT Replace the handlebar switch (left).

INCORRECT
8.Main switch
Refer to “CHECKING THE SWITCH”.

CORRECT Replace the main switch.

9.Pickup coil resistance

● Disconnect the AC magneto coupler from
the wire harness.
● Connect the pocket tester (Ω × 100) to the
pickup coil terminal.
Tester (+) lead → White/Red terminal 1
Tester (–) lead → White/Green terminal 2

● Check the pickup coil for the specified OUT OF SPECIFICATION

resistance.

Pickup coil resistance:

459 ~ 561 Ω at 20 °C (68 °F)
(White/Red – White/Green) Replace the pickup coil/starter assembly.

MEETS
SPECIFICATION

*
– 18 –
 – +
IGNITION SYSTEM ELEC
*
C0NTINUITY

10.Charging/rotor rotation direction detec-

tion coil resistance
● Disconnect the AC magneto coupler from
the wire harness.
● Connect the pocket tester (Ω × 100) to the
charging/rotor rotation direction detection
coil terminal.
Tester (+) lead → Red terminal 1
Tester (–) lead → White/Blue terminal 2

● Check the charging/rotor rotation direction

detection coil for the specified resistance. OUT OF SPECIFICATION

Rotor rotation direction detec-

tion coil resistance:
0.083 ~ 0.101 Ω at 20 °C (68 °F)
(Red – White/Blue) Replace the pickup coil/stator assembly.

MEETS
SPECIFICATION

11.Wiring connection
● Check the connections of the entire ignition POOR CONNECTION
system.
Refer to “CIRCUIT DIAGRAM”.

CORRECT Properly connect the ignition system.

Replace the CDI unit.

– 19 –
 3 Main switch
R R
EB806000

1 W/R W/R O O
4 Fuse
0
W/G W/G A
5 Battery
W/G B
R/B L/W O B C Neutral relay
W
R W/G W/G R
R W/R W/G
W W
W/L W/R W/R W/G D Drive select lever switch
4 E Neutral switch
W W W
R/W R/W G/Y
G/Y G/W
W F Neutral indicator light
W/B B/Y G/Y
W W
CIRCUIT DIAGRAM

R R/W
W W W R G Reverse indicator light
L/W
L/W B
SIGNAL SYSTEM

3 9 H Reverse switch
R/B B B G/Y B
ON R R
6 I Rear brake light switch
W/B
2 OFF R
R Br Br R L/W L/W G/W BJ Front brake light switch
R R/W R/W B/Y
R B
(GRAY) (GRAY) 5 K Tail/brake light
W W W Br
B B

(GRAY)
R/W
B B
8
B 7
B R
B
W W W

(GRAY) B B

– 20 –
G/W Sb

Br W/B
Br Br

M Br R/B R/W Br Br W/B Br (GREEN)

L R/B R/B L C
R/W Br Br R/W N O P J I G F
OFF OFF OFF B B B B
LO ON PUSH
Y G G Y HI (BLACK) (BLACK) Sb G/W
B B Y
Y Br Y Br
G/L Sb

L G Y B (BLACK) (BLACK) Sb G/W

SIGNAL SYSTEM

L Y G/W

G Y G Y H
G/W

L L E D
G Y Y G Y G G Y

B B B B
K
ELEC

B B
–

B
+
 – +
SIGNAL SYSTEM ELEC
CHECKING THE SIGNAL SYSTEM
1.If the tail/brake light fails to come on:

1.Bulb and bulb socket

NO CONTINUITY
● Check the bulb and bulb socket for continu-
ity.

CONTINUITY Replace the bulb and/or bulb socket.

NO CONTINUITY
2.Brake light switches
Refer to “CHECKING THE SWITCH”.

CONTINUITY Replace the brake switch.

3.Voltage
● Connect the pocket tester (DC 20V) to the
bulb socket connector.
Tester (+) lead → Yellow terminal 1
Tester (–) lead → Black terminal 2

OUT OF SPECIFICATION
● Turn the main switch to “ON”.
● Check the voltage (12 V) of the “Yellow”
lead on the bulb socket connector.

MEETS The wiring circuit from the main switch to the

SPECIFICATION bulb socket connector is faulty, repair it.

This circuit is not faulty.

– 21 –
 YAMAHA MOTOR CO., LTD.
2500 SHINGAI IWATA SHIZUOKA JAPAN

PRINTED IN U.S.A.
YFM350XP WIRING DIAGRAM
1 AC magneto
R R 2 Rectifier/regulator
W/R W/R O O
1 0 3 Main switch
W/G W/G A
W/G B
4 Fuse
W
R/B L/W O B 5 Battery
R W/G W/G R
R W/R W/G 6 Starter relay
W W
W/L W/R W/R W/G
7 Starter motor
4 Clutch switch
W W W 8
R/W R/W G/Y
G/Y G/W
W 9 CDI unit
W/B B/Y G/Y
W W R/W
0 Ignition coil
R
W W W R
L/W A Spark plug
L/W B
3 9 B Park switch
R/B B B G/Y B
ON R R
6 C Neutral relay
W/B
2 OFF R D Drive select lever switch
R Br Br R L/W L/W G/W B

R R/W R/W B/Y

E Neutral switch
R B
(GRAY) (GRAY) 5 F Neutral indicator light
W W W Br
B
G Reverse indicator light
B
(GRAY) H Reverse switch
R/W
B B I Rear brake light switch
8 J Front brake light switch
B 7
B R
K Tail/brake light
B
W W W
L Headlight
B B
M Handlebar switch (left)
(GRAY)
N Lights switch
O Engine stop switch
P Start switch

G/W Sb

Br W/B
Br Br

M Br R/B R/W Br Br W/B Br (GREEN)

L R/B R/B L C
R/W Br Br R/W N O P J I G F
OFF OFF OFF B B B B
LO ON PUSH
Y G G Y HI (BLACK) (BLACK) Sb G/W
B B Y Y
Y Br Y Br
G/L Sb

L G Y B (BLACK) (BLACK) Sb G/W

L Y G/W

G Y G Y H
G/W

L L E D
G Y Y G Y G G Y

B B B B
K

B B

COLOR CODE
B ............Black Sb ..........Sky blue G/Y.........Green/Yellow W/L ....... White/Blue
Br ...........Brown W ...........White L/W ........Blue/White W/R ....... White/Red
G............Green Y ............Yellow R/B.........Red/Black
L.............Blue B/Y.........Black/Yellow R/W........Red/White
O............Orange G/L.........Green/Blue W/B ........White/Black
R ............Red G/W .......Green/White W/G........White/Green