1997-2001 Honda CR250 Engine Top End Specifications

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

If you need parts and tools make sure to buy them here!

Related: 1997-2001 Honda CR250 – Top End Service – Introduction

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 Ratio8.7:1
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

 

Fix Your Dirt Bike Logo

This site uses Akismet to reduce spam. Learn how your comment data is processed.