Engine Specifications - Yamaha YJ50RN Service Manual

ENGINE SPECIFICATIONS

Item
Engine
Engine type
Induction system
Displacement
Cylinder arrangement
Bore × stroke
Compression ratio
Engine idling speed
Fuel
Recommended fuel
Fuel tank capacity
Total (including reserve)
Engine oil
Lubrication system
Oil type or grade
Quantity
Capacity
Air filter oil grade
Transmission
Recommended oil
Periodic oil change
Total amount
Starting system type
Spark plug
Model (manufacturer) × quantity
Spark plug gap
Cylinder head
Max. warpage
Cylinder
Cylinder arrangement
Bore × stroke
Compression ratio
Bore
Max. taper
Max. out-of-round
ENGINE SPECIFICATIONS
Standard
Air-cooled, 2-stroke
Reed valve
3
49 cm
Forward inclined single cylinder
40.0 × 39.2 mm (1.57 × 1.54 in)
7.3 : 1
1,800 r/min
Unleaded fuel
6 L (5.3 Imp qt, 6.3 US qt)
Separate lubrication (Yamaha autolube)
Yamalube 2-cycle oil or
2-stroke engine oil
1.4 L (1.23 Imp qt, 1.48 US qt)
Foam air-filter oil or SAE 10W30SE
Yamalube 4 (10W30) or SAE 10W30 type
SE motor oil
0.1 L (0.09 Imp qt, 0.11 US qt)
0.11 L (0.1 Imp qt, 0.12 US qt)
Electric and kick starter
BPR7HS (NGK)
0.6 ~ 0.7 mm (0.02 ~ 0.03 in)
----
Forward inclined single cylinder
40.0 × 39.2 mm (1.57 × 1.54 in)
7.3 : 1
39.993 ~ 40.012 mm (1.5745 ~ 1.5753 in)
----
----
2 - 2
SPEC
Limit
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
0.02 mm
(0.0008 in)
----
----
----
----
0.05 mm
(0.002 in)
0.05 mm
(0.002 in)
2