1981 ATC250R Specifications

General Specs
ManufacturerHonda
Year1981
ModelATC250R
Model CodeTB06
Product Code961
Frame VIN LocationStamped on left side of frame neck
Engine Serial LocationStamped on lower right side of crankcase
Frame Starting NumberJH3TB060*BC000020
Engine Starting NumberTB06E-2000033
Owner Manual3196100
Service Manual6196103
Chassis
Length1795 mm (70.7 in)
Width1075 mm (42.3 in)
Height1040 mm (40.9 in)
Seat Height710 mm (28 in)
Wheelbase1197 mm (47.1 in)
Ground Clearance115 mm (4.5 in)
Dry Weight137 kg (302.1 lb)
Caster Angle21°
Trail45 mm (1.77 in)
Tire & Rim
Front Tire Size22x11-8
Rear Tire Size22x11-8
Engine
Engine Type2 Stroke air cooled
Cylinder ArrangementSingle cylinder inclined 3 degrees
Displacement248 cc (15.1 ci)
Bore70 mm (2.8 in)
Stroke64.4 mm (2.5 in)
Compression Ratio6.6:1
Starter TypeForward kick start
Fuel TypePre-mixed 20:1
Oil Capacity - Total1.1 L (1.2 US qt; 1 Imp qt)
Oil Capacity - Oil Change0.9 L (1 US qt; 0.8 Imp qt)
Engine Dry Weight30 kg (66.2 lb)
Drive Train & Transmission
Clutch TypeManual wet multiplate
Transmission Type5 speed constant mesh
Primary Reduction3.250
First Gear1.900
Second Gear1.591
Third Gear1.240
Fourth Gear1.000
Fifth Gear0.839
Final Reduction3.385
Gear Shift Pattern1 - N - 2 - 3 - 4 - 5
DrivelineChain
Carburetor
BrandKeihin
Identification MarkPE23A
TypePiston valve
Throttle Bore27 mm (1.1 in)
Main Jet#158
Pilot Jet/Slow Jet#50
Jet Needle Clip Position3rd Groove
Pilot Screw Adjustment1 3/8 Turns out
Float Level18.5 mm (0.7 in)
Engine Idle1300 RPM
Air Filter TypeOiled polyrethane foam
Fuel Tank Capacity8.4 L (2.2 US gal; 1.8 Imp gal)
Fuel Tank Reserve1.9 L (0.5 US gal; 0.4 Imp gal)
Ignition
Ignition TypeCDI
CDI Identification MarkCI-14
Spark PlugB8ES (NGK) - US
BR8ES (NGK) CAN
Spark Plug Gap Max0.7-0.8 mm (0.028-0.031 in)
Pulse Generator20-60 Ω
Exciter Coil245 Ω
Ignition Coil Primary0.2-0.8 Ω
Ignition Coil Secondary w/o Cap8000-15000 Ω
Initial Ignition Timing17.0° BTDC
Full Advance Ignition Timing14.0° BTDC
Ignition Advancement TypeElectronic
Electrical
Voltage12 V
Alternator Max Output73 W
Alternator Max Output RPM7600 RPM
Brakes
Front Brake OperationRight Hand
Rear Brake OperationRight Foot
Front Brake TypeHydraulic Disc
Rear Brake TypeDrum
Suspension
Front SuspensionTelescopic fork
Rear SuspensionPro-link Swing arm
Front Wheel Travel170 mm (6.7 in)
Rear Wheel Travel110 mm (4.3 in)
Front Fork Oil Capacity174 cc (5.9 US fl oz; 6.1 Imp fl oz)

Information on this page is provided in good faith that it is accurate, but in no way is the data guanteed to be accurate. If there are any mistakes, please contact me.