Engine overheating (for CS50Z)EWA10400
s s
WARNING
●Do not remove the radiator cap when the engine and radiator are hot. Scalding hot fluid and steam may be
blown out under pressure, which could cause serious injury. Be sure to wait until the engine has cooled.
●After removing the radiator cap retaining bolt, place a thick rag, like a towel, over the radiator cap, and then
slowly rotate the cap counterclockwise to the detent to allow any residual pressure to escape. When the his-
sing sound has stopped, press down on the cap while turning it counterclockwise, and then remove the cap.
PERIODIC MAINTENANCE AND MINOR REPAIR
6-26
6
Wait until the
engine has cooled.Check the coolant level in the
reservoir and radiator.
The coolant level
is OK.
The coolant level is low.
Check the cooling system
for leakage.
Have a Yamaha dealer checkand repair the cooling system.
Add coolant. (See NOTE.)
Start the engine. If the engine overheats again, have a
Yamaha dealer check and repair the cooling system.
There is
leakage.
There is
no leakage.
NOTE:
If coolant is not available, tap water can be temporarily used instead, provided that it is changed to the recommended
coolant as soon as possible.
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Dimensions:Overall length:
1740 mm (68.5 in)
Overall width:
675 mm (26.6 in)
Overall height:
1065 mm (41.9 in)
Seat height:
770 mm (30.3 in)
Wheelbase:
1210 mm (47.6 in)
Ground clearance:
132 mm (5.19 in)
Weight:With oil and fuel:
CS50/CS50M: 81.0 kg (178.6 lb)
CS50Z: 84.0 kg (185.2 lb)
Engine:Engine type:
CS50/CS50M: Air cooled 2-stroke
CS50Z: Liquid cooled 2-stroke
Cylinder arrangement:
Forward-inclined single cylinder
Displacement:
49.0 cm
3(2.99 cu.in)
Bore x stroke:
40.0 x 39.2 mm (1.57 x 1.54 in)
Compression ratio:
CS50: 11.60:1
CS50M: 10,10 :1
CS50Z: 11.40 :1
Starting system:
Electric starter and kickstarterLubrication system:
Separate lubrication (Yamaha autolube)
Engine oil:Type:
YAMALUBE 2-cycle oil or 2-stroke engine
oil (JASO FC grade) or (ISO EG-C or EG-
D grade)
Engine oil quantity:
Quantity:
1.4 L (1.48 US qt) (1.23 Imp.qt)
Final transmission oil:Type:
SAE10W30 type SE motor oil
Quantity:
0.11 L (0.12 US qt) (0.10 Imp.qt)
CS50Z: Cooling system:Coolant reservoir capacity (up to the maxi-
mum level mark):
0.25 L (0.26 US qt) (0.22 Imp.qt)
Radiator capacity (including all routes):
0.91 L (0.96 US qt) (0.80 Imp.qt)
Air filter:Air filter element:
Wet element
Fuel:Recommended fuel:
Regular unleaded gasoline only
Fuel tank capacity:
5.5 L (1.45 US gal) (1.21 Imp.gal)
Fuel reserve amount
1.9 L (0.50 US gal) (0.42 Imp.gal)
Carburetor:Manufacturer:
GURTNERType x quantity:
PY 12 x 1
Spark plug(s):Manufacturer/model:
CS50-CS50Z: NGK/BR8HS
CS50M: NGK/BPR4HS
Spark plug gap:
0.6–0.7 mm (0.024–0.028 in)
Clutch:Clutch type:
Dry, centrifugal automatic
Final transmission oil:Primary reduction system:
Helical gear
Primary reduction ratio:
52 x 13 (4.000)
Secondary reduction system:
Spur gear
Secondary reduction ratio:
CS50: 42 x 13 (3.231)
CS50M: 45 x 12(3.750)
CS50Z: 43 x 13 (3.308)
Transmission type:
V-belt automatic
Operation:
Centrifugal automatic type
Chassis:Frame type:
Steel tube underbone
Caster angle:
25.00 °
Trail:
80.0 mm (3.15 in)
SPECIFICATIONS
8-1
8
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