4-43
CAUTION:_ Never turn an adjusting mechanism beyond
the minimum and maximum settings. _NOTE:_ Although the total number of clicks of a damping
force adjusting mechanism may not exactly match
the above specifications due to small differences in
production, the actual number of clicks always repre-
sents the entire adjusting range. To obtain a precise
adjustment, it would be advisable to check the num-
ber of clicks of each damping force adjusting mech-
anism and to modify the specifications as necessary. _
WARNING
_ Suspension components become hot during
operation. Never touch the compression
damping adjuster, rebound damping adjuster
or oil reservoir with your bare hand or skin un-
til suspension components have cooled. _
From the fully turned-out position
Minimum (soft): 1 click in
Standard: 7 clicks in
Maximum (hard): 12 clicks in
U5LP61.book Page 43 Monday, August 27, 2001 3:49 PM
8-119
EBU00413
Troubleshooting
Although Yamaha machines receive a rigid in-
spection before shipment from the factory, trouble
may occur during operation.
Any problem in the fuel, compression, or ignition
systems can cause poor starting and loss of pow-
er. The troubleshooting chart describes a quick,
easy procedure for making checks. If your ma-
chine requires any repair, take it to a Yamaha
dealer.
The skilled technicians at a Yamaha dealership
have the tools, experience, and know-how to prop-
erly service your machine. Use only genuine
Yamaha parts on your machine. Imitation parts
may look like Yamaha parts, but they are often in-
ferior. Consequently, they have a shorter service
life and can lead to expensive repair bills.
WARNING
Do not smoke when checking the fuel system.
Fuel can ignite or explode, causing severe in-
jury or property damage. Make sure there are
no open flames or sparks in the area, including
pilot lights from water heaters or furnaces.
U5LP61.book Page 119 Monday, August 27, 2001 3:49 PM
10-1
EBU00428
SPECIFICATIONS
MODEL YFM660R
Dimension:
Overall length
Overall width
Overall height
Seat height
Wheel base
Ground clearance
Minimum turning radius1,830 mm
1,100 mm
1,150 mm
860 mm
1,245 mm
265 mm
3,300 mm
Basic weight:
With oil and full fuel tank 193 kg
Engine:
Type
Cylinder arrangement
Displacement
Bore
× stroke
Compression ratio
Starting system
Lubrication systemLiquid-cooled, 4-stroke, SOHC
Forward inclined single cylinder
660 cm
3
100
× 84 mm
9.2 : 1
Electric starter
Dry sump
U5LP61.book Page 1 Monday, August 27, 2001 3:49 PM
