Grey Ghost Registry
Specifications
OEM Part No. 1990 Fat Boy Derby Cover
25419-89
OEM Part No. 1990 Fat Boy Timer Cover
32525-89
Pay close attention to the belt buckle! A different shape belt buckle was introduced after 1990, while the bags remained the same. These details are important if you want your bike to be original.
Stopping Distance
1. Light Load 161
2. Maximum Load 177
* Stopping distance in feet from 60 MPH
*1. Light Load includes 200 lb. driver - no accessories
*2. Maximum load includes 300 lb. driver and passenger plus full accessory
Color
Fine Silver Metallic 98603 HW (discontinued)
Frame painted as well
Oil tank painted as well
Fender Struts painted as well
Dimensions (IN.)
Wheelbase 62.5
Overall Length 93.8
Overall Width 38.0
Road Clearance 5.25
Overall Height 49.0
Saddle Height 26.5
Brake Disc (IN.)
Front 11.5
Rear 11.5
Minimum thickness
0.2
Weight (LBS.)
Dry Weight 650
GVWR (Gross vehicle weight rating) 1085
GVWR Front (Gross vehicle weight rating) 390
GVWR Rear (Gross vehicle weight rating) 695
Capacities (U.S.)
Fuel Tank (gallons) 4.2
Fuel Tank reserve (gallons) 0.75
Oil Tank (quarts) 3.0
Transmission (pints) 1
Front Fork-each (ounches) 11.5
Primary (quarts) 1.5
Ignition System
Spark timing
Start TDC
Fast idle 35° BTDC
1800-2800 RPM 35° BTDC
Battery 12 Volt 19 amp. hr.
Spark Plugs
Type HD-5R6A
Size 14mm
Gap 0.038-0.043 in.
Torque 18-22 ft-lbs
Engine
Number of cylinders 2
Type 4-Cycle, 45 Degree V Twin
Compression 8.5 to 1
Horse Power
54 @ 4500 RPM
69.5 @ 5000 RPM
Bore in. (mm) 3.498 (88.8)
Stroke in. (mm) 4.25 (108.0)
Displacement cu .in. (cc) 81.6 (1338.6)
Torque lb-ft
80 @ 2500 RPM
80 @ 4000 RPM
Transmission
Type Constant mesh, Foot Shift
Speeds 5 Forward
Number of Sprocket Teeth
Engine 24
Clutch 37
Transmission 32
Rear Wheel 70
Overall Gear Ratios
First low Gear 10.93
Second Gear 7.45
Third Gear 5.4
Fourth Gear 4.16
Fifth Gear 3.37
Light Bulb overview
Headlamp 67713-86
Tail and Stop Lamp 68165-64
Instrument panel
High beam 68462-64
Oil pressure 68462-64
Neutral 68462-64
Turn Signal 68462-64
Speedometer 71099-74
Turn Signal
Front 68165-64
Rear 68572-64A
Oils
Engine oil
SAE 20W50
Transmission
99892-84
Checking engine oil level
Straight up and level
Primary chain deflection
Hot
3/8-5/8 in.
Cold
5/8-7/8 in.
Rear Belt deflection
3/8-1/2 in. (with 10lbs of force)
Tire Data (dunlop tires)
Size
130/90-16
Pressure Front solo 36 PSI
Pressure Front 2 Up 36 PSI
Pressure Rear solo 36 PSI
Pressure Rear 2 Up 40 PSI
Genuine Harley Maintenance part no.
Oil Filter 63805-80
Spark Plug 32311-83
Primary Chaincase lube 99887-84
Transmission lube 99892-84
Fork oil (Type E) 99884-80
Brake Fluid (DOT 5) 99902-77
Fuel additive 99893-86
Rear Belt 40023-86
Air Cleaner 29259-86
Battery 65991-82A
Engine Oil SAE 20W50
Tools
Harley Davidson
Belt Tension Gauge HD-35381
Spanner Wrench HD-94820-75
Oil filter Wrench HD-96221-80
Motion Pro
Belt Tension Gauge 08-0350
Rear Wheel Alignment Tool 08-0368
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