1997-2001 Honda CR250 Engine Top End Specifications

Honda LogoEngine Top End Specifications For Your 1997-2001 Honda CR250 Dirt Bike.

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Engine Specifications

Engine Type2-Stroke, Single Cylinder, Liquid Cooled
Engine Intake SystemCrankcase Reed Valve
Engine Displacement249.3cc (15.2ci)
Engine Dry Weight51.4 lb. (23.3 kg)
Bore & Stroke66.4 x 72.0 mm (2.61 x 2.83 in)
Lubrication32:1 Fuel/Oil Premix
Compression Ratuio8.7:1
CrankshaftAssembly Type
Ignition Timing
– 199718° At 3000 RPM
– 1998-200118° ± 2° At 3000 RPM

Engine Service Specifications

New – mm (in.)Service Limit – mm (in.)
Measurement Point I.D.
– Size A Cylinder66.398-66.405 (2.6141-2.6144)66.430 (2.615)
– Size B Cylinder66.390-66.398 (2.6138-2.6141)66.428 (2.615)
Cylinder Warp Limit0.05 (0.002)
Cylinder Taper Limit0.05 (0.002)
Cylinder Out Of Round Limit0.05 (0.002)
Cylinder Head Warp Limit0.05 (0.002)
Piston
O.D. Measurement Point15-20 (0.59-0.95) From Skirt Bottom
– O.D. Size A Piston66.330-66.338 (2.6114-26.117)66.28 (2.609)
– O.D. Size B Piston66.323-66.330 (2.6111-2.6114)66.273 (2.609)
Piston-To-Cylinder Clearance0.060-0.075 (0.0024-0.0029)0.09 (0.004)
Piston Pin Bore I.D.18.007-18.013 (0.7089-0.792)18.02 (0.709)
Piston Pin O.D.17.994-18.000 (0.7084-0.7087)17.98 (0.707)
Piston Pin-To-Piston Clearance0.007-0.019 (0.0003-0.0007)0.04 (0.0016)
Piston Ring-to-ring Groove Clearance
– Top Ring0.045-0.075 (0.002-0.003)0.095 (0.0037)
– Second Ring0.025-0.055 (0.001-0.002)0.075 (0.026)
Piston Ring End Gap0.40-0.55 (0.016-0.022)0.65 (0.13)
Piston Mark DirectionIN Facing Intake Side
Connecting Rod Small End I.D.21.997-22.009 (0.8660-0.8665)22.02 (0.867)
Exhaust Valve Shaft O.D.4.988-5.000 (0.1964-0.1969)4.968 (0.196)
Engine Torque Specifications
N•nin.-lb.ft.-lb.
Cylinder Mounting Nuts3929
Cylinder Head Nuts2720
Cylinder Stud Bolts12106
Cylinder Cover Bolts (Right)1088
Engine Upper Mounting Nut
– 1997-19993929
– 2000-20015440
Engine Lower Mounting Nuts
– 1997-19983929
– 19996447
– 2000-20015440
Engine Hanger Plate Nuts2620
Engine Stop Button Screw1.513
Exhaust Front Chamber Bolt
– 1998-19991088
– 200012106
– 20011410
Exhaust Valve Cap (Left)13115
Exhaust Valve Stopper Bolt16
Exhaust Valve Linkage Allen Bolt5.448
Exhaust Valve Pinion Holder Allen Bolt5.448
Spark Plug1813

 

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