Page 32 of 72
OPERATION AND IMPORTANT RIDING POINTS
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EAU16660
Starting a warm engine
Follow the same procedure as for start-
ing a cold engine with the exception
that the starter (choke) is not required
when the engine is warm. Instead, start
the engine with the throttle slightly
open.
NOTE:
If the engine does not start after several
kicks, try again with the throttle 1/4 to 1/
2 open.
EAU39901
Shifting
This motorcycle has a 3-speed trans-
mission with a centrifugal, automatic
clutch. Shifting gears lets you control
the amount of engine power available
for starting off, accelerating, climbing
hills, etc.
The gear positions are shown in the il-
lustration.
NOTE:
To shift the transmission into the neu-
tral position, press the shift pedal down
repeatedly until it reaches the end of its
travel.
CAUTION:
ECA15441
Even with the transmission in
the neutral position, do not
coast for long periods of time
with the engine off, and do not
tow the motorcycle for long dis-
tances. The transmission is
properly lubricated only when
the engine is running. Inade-
quate lubrication may damage
the transmission.
Always release the throttle grip
before changing gears to avoid
damaging the engine, transmis-
sion, and drive train, which are
not designed to withstand the
shock of shifting when the throt-
tle grip is open.
EAU39910
To start out and accelerate
1. Close the throttle.
2. Shift into first gear and release the
shift pedal.
CAUTION:
ECA15460
Always close the throttle before
1. Shift pedal
2. Neutral position
1
12 3N2
Page 36 of 72
PERIODIC MAINTENANCE AND MINOR REPAIR
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EAU41763
Periodic maintenance and lubrication chart
NOTE:
From 160 hours, repeat the maintenance intervals starting from 40 hours.
Items marked with an asterisk should be performed by a Yamaha dealer as they require special tools, data and technical
skills.
NO. ITEM CHECK OR MAINTENANCE JOBINITIAL THEREAFTER EVERY
10
hours20
hours40
hours80
hours40
hours80
hours160
hours
1*Fuel line
Check fuel hoses for cracks or damage.Replace if necessary.
2Spark plugCheck condition.Adjust gap and clean.Replace if necessary.
3Air filter elementClean with solvent.Replace if necessary.
4*ClutchCheck operation.Adjust if necessary.
5*Front brakeCheck operation.Adjust brake lever free play.Replace brake shoes. Whenever worn to the limit
6*Rear brakeCheck operation.Adjust brake pedal free play.Replace brake shoes. Whenever worn to the limit
7*WheelsCheck runout, spoke tightness and for
damage.Tighten spokes if necessary.
Page 42 of 72
PERIODIC MAINTENANCE AND MINOR REPAIR
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CAUTION:
ECA10452
In order to prevent clutch slip-
page (since the transmission oil
also lubricates the clutch), do
not mix any chemical additives.
Do not use oils with a diesel
specification of “CD” or oils of a
higher quality than specified. In
addition, do not use oils labeled
“ENERGY CONSERVING II” or
higher.
Make sure that no foreign mate-
rial enters the transmission.
5. Start the engine, and then let it idle
for several minutes while checking
the transmission for oil leakage. If
oil is leaking, immediately turn the
engine off and check for the cause.
EAU41161
Cleaning the air filter element
The air filter element should be cleaned
at the intervals specified in the periodic
maintenance and lubrication chart.
Clean the air filter element more fre-
quently if you are riding in unusually
wet or dusty areas.
1. Remove the air filter case cover by
removing the screws.
2. Pull the air filter element out.3. Remove the sponge material from
the air filter case cover, clean it
with solvent, and then squeeze the
remaining solvent out.
Recommended transmission oil:
See page 8-1.
Oil change quantity:
0.65 L (0.69 US qt) (0.57 Imp.qt)
1. Air filter case cover
2. Screw
2
2
1
1. Sponge material
2. Air filter case cover
1
2
Page 66 of 72
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SPECIFICATIONS
EAU2633G
Dimensions:
Overall length:
1540 mm (60.6 in)
Overall width:
640 mm (25.2 in)
Overall height:
880 mm (34.6 in)
Seat height:
635 mm (25.0 in)
Wheelbase:
1055 mm (41.5 in)
Ground clearance:
185 mm (7.28 in)
Minimum turning radius:
1700 mm (66.9 in)
Weight:
With oil and fuel:
61.0 kg (134 lb)
Engine:
Engine type:
Air cooled 2-stroke
Cylinder arrangement:
Forward-inclined single cylinder
Displacement:
79.0 cm
3
Bore
×
stroke:
47.0
×
45.6 mm (1.85
×
1.80 in)
Compression ratio:
6.60 :1
Starting system:
KickstarterLubrication system:
Separate lubrication (Yamaha autolube)
Type:
YAMALUBE 2 or 2-stroke engine oil (JASO
FC grade) or (ISO EG-C or EG-D grade)
Engine oil quantity:
Quantity:
0.9 L (1.00 US qt) (0.84 Imp.qt)
Transmission oil:
Type:
YAMALUBE 4 (10W30) or SAE10W30 type
SE motor oil
Oil change quantity:
0.65 L (0.69 US qt) (0.57 Imp.qt)
Air filter:
Air filter element:
Wet element
Fuel:
Recommended fuel:
Regular unleaded gasoline only
(AUT)(BEL)(CHE)(DEU)(DNK)(ESP)(FIN)
(FRA)(GBR)(GRC)(IRL)(NLD)(NOR)(PRT)
(SWE)(ZAF)
Unleaded gasoline only (AUS)(NZL)
Fuel tank capacity:
4.9 L (1.29 US gal) (1.08 Imp.gal)
Fuel reserve amount:
1.0 L (0.26 US gal) (0.22 Imp.gal)
Carburetor:
Manufacturer:
MIKUNI
Type
×
quantity:
VM15SC x 1
Spark plug (s):
Manufacturer/model:
NGK/BP6HS (AUS)(NZL)
NGK/BPR6HS
(AUT)(BEL)(CHE)(DEU)(DNK)(ESP)(FIN)
(FRA)(GBR)(GRC)(IRL)(NLD)(NOR)(PRT)
(SWE)(ZAF)
Manufacturer/model:
DENSO/W20FP (AUS)(NZL)
Spark plug gap:
0.6–0.7 mm (0.024–0.028 in)
Clutch:
Clutch type:
Wet, multiple-disc automatic
Transmission:
Primary reduction system:
Helical gear
Primary reduction ratio:
66/21 (3.143)
Secondary reduction system:
Chain drive
Secondary reduction ratio:
32/15 (2.133)
Transmission type:
Constant mesh 3-speed
Operation:
Left foot operation
Gear ratio:
1st:
39/12 (3.250)
2nd:
29/16 (1.812)
