Granted this one is a little rough and definitely fits into the rat bike class but she runs like
a top. Someone added a few high-perf goodies back in the day like a Supertrapp exhaust and a
Kerker oil cooler. All it takes it a little twist and it's easy to hear the sport-bikes of the
future lurking in her genes.
Found a nice stock replacement seat, replaced the tires with some Dunlop 404s, installed a new battery,
plugs, front brake pads, straightened a few things up and cleaned off some of the grease.
Well the old Musclerat hauled me fine with power to spare but I felt like John Wayne on a shetland
pony so down the road she went. I made a few bucks on the deal and got the satisfaction of giving the
old girl a new lease on life. The guy that bought her was about five foot nine and maybe a buck sixty soaking wet.
You should of seen the grin on his face...
Make and Model
1979 Yamaha XS11 SF Special
Color
Black Gold
MSRP 1979
$3699.00
Engine
1102 cc (67.2 cid) air cooled DOHC inline 4-cylinder
Bore x Stroke
2.82 x 2.70 in (71.5 mm x 68.6 mm)
Compression Ratio
9.2:1
Carburetion
4 x 34 mm Mikuni constant-velocity
Ignition System
Dual coil electronic with vacuum advance
Transmission
5-speed constant-mesh, wet clutch, shaft final drive
Gear Ratios
1st-2.24, 2nd-1.63, 3rd-1.29, 4th-1.03, 5th-0.88
Final Ratio
3.26:1
Fuel Tank Capacity
3.8 gal
Average Milage
44 mpg
Dry Weight
563 lbs
Weight Dist
45.2% front - 54.8% rear
Wheelbase
60.8 in
Seat Height
31.7 in
Ground Clearance
6.1 in
Steering Head Angle
29.5°
Front Wheel Trail
5.12 in
Front Tire
100/90-19, MM90-19, 3.25/3.50-19
Rear Tire
130/90-16, MT90-16, 5.00/5.10-16
Front Fork
3-way adjustable spring preload with 6.6 inches travel
Rear Shocks
5-way adjustable nitrogen spring preload with 4.0 inches travel
Front Brake
Dual 11.7 in (300 mm) discs
Rear Brake
Single 11.7 in (300 mm) disc
Stopping Distance
33 ft from 30 mph, 136 ft from 60 mph
Horsepower
95 bhp at 8000 rpm
Torque
67 lbs-ft at 6500 rpm
HP @ Wheel
75 hp at 8000 rpm
Torque @ Wheel
54 lbs-ft at 6500 rpm
Standing Quarter
11.93 sec @ 114 mph
Est Top Speed
135 mph (Not with this fat old guy on her that's fer sure)
Here's how she looked when I got her home.
Not sure what people were thinking with that style of seat.
