New for the 2005 Honda CRF250R:
- New cylinder design features RC exhaust valve housed in removable
case for improved sealing and performance.
- New precision-cut stainless steel cylinder base gasket and
revised port timing for improved bottom-end and mid-range
power.
- New cylinder head combustion chamber shape for improved bottom-end
and mid-range power. New one-piece exhaust valve for improved
sealing.
- New piston dome shape for improved intake charge flow.
- New piston features single keystone piston ring for reduced
friction and improved sealing.
- New crankshaft design for improved drivability.
- New crankcase with redesigned intake port for smoother air
flow and increased journal thickness to decrease crank deflection.
- New six-petal reed valve with narrower profile for stronger
bottom-end power.
- New reed valve mounting angle to improve charge flow and top-end
power.
- New ECU mapping and RC valve control settings to match new
engine power characteristics.
- New exhaust pipe shape has increased volume for improved low-
to mid-range power.
- Thicker radiator core (from 24mm to 28mm) improves cooling
capacity to handle extra power.
- New front axle placement for improved fork action and turning.
- New swingarm features a dual-axis, double-taper design with
a large cast aluminum cross member that is lighter weight
and stronger.
- New rear hub is stronger and lighter.
- New rear shock valving for improved bump absorption.
- New Honda Racing-inspired graphics.
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