2009-2010 Honda CRF450R Cylinder / Piston Specifications

Cylinder & Piston Specifications For Your 2009 – 2010 Honda CRF450R Dirt Bike.

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Related: 2009-2010 Honda CRF450R Cylinder Head / Valve Specifications

PartStandard (mm)Service Limit (mm)
Cylinder
– I.D.96.000 – 96.01596.025
– Out-of-Round0.010
– Taper0.010
– Warpage0.05
Piston, Piston Ring
– Piston Mark Direction“IN” mark facing toward the intake side
– Piston O.D.95.970 – 95.98095.940
– Piston O.D. Measurement Point7.0 (0.30) from bottom of skirt) –
– Piston Pin Bore I.D.19.002 – 19.00819.03
– Piston Pin O.D.18.994 – 19.00018.99
– Piston-to-Piston Pin Clearance0.002 – 0.0140.04
– Top ring Mark“R” mark side facing up –
Piston Ring-to-Ring Groove Clearance
– Top0.065 – 0.1000.12
Piston Ring End Gap
– Top Ring0.25 – 0.310.32
– Oil Ring (Side Rail)0.20 – 0.700.71
Cylinder-to-Piston Clearance0.020 – 0.0450.085
Connecting Rod Small End I.D.19.016 – 19.03819.05
Connecting Rod-to-Piston Pin Clearance0.016 – 0.0440.06

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