JE Pistons
Fitment:
-06-14 Honda TRX450R
-02-08 Honda CRF450R
-05-17 Honda CRF450X
Bore Size: 99mm (+3mm Big Bore). Aftermarket Big Bore Cylinder or Big Bore Sleeve is highly recommended. OEM Bored Cylinders get awfully thin cylinder walls when bored to 99mm Bore.
Pro Series Pistons feature lightweight boxed forging. Forgings also feature additional bracing. Pistons are machined to have ultra flat ring groove (which improves ring stability, reduces ring flutter, and improves ring seal capability). Pistons also feature low friction skirt design.
Replacement Components are available, please see below.
Includes:
-JE Forged Piston
-JE Piston Ring Pack
-JE Wrist Pin
-1 Set of JE Piston Pin Clips
Piston Specs:
99mm 12.5:1 Pistons (325026):
-Bore Diameter: 99.00mm
-Piston Head Type: Dome
-Piston Dome Volume: -2.36cc's
-Cylinder Head: TRX 450
-Compression Height: 0.943"
-Piston Pin Outside Diameter: 0.748"
-Piston Pin Length: 2.050"
-Piston Pin Material: 9310 Steel
-Ringset Included: Yes
-Top Compression Ring Thickness: 0.0383"
-Second Compression Ring Thickness: 0.060"
-Oil Ring Thickness: 0.0795"
-Piston Material: 2618 Aluminum Forged
-Forging Type: FSR
-Piston Avg Weight: 289 g
-Pin Wall Thickness: 0.160"
99mm 13.5:1 Pistons (325027):
-Bore Diameter: 99.00mm
-Piston Head Type: Dome
-Piston Dome Volume: 0.96cc's
-Cylinder Head: TRX 450
-Compression Height: 0.943"
-Piston Pin Outside Diameter: 0.748"
-Piston Pin Length: 2.050"
-Piston Pin Material: 9310 Steel
-Ringset Included: Yes
-Top Compression Ring Thickness: 0.0383"
-Second Compression Ring Thickness: 0.060"
-Oil Ring Thickness: 0.0795"
-Piston Material: 2618 Aluminum Forged
-Forging Type: FSR
-Piston Avg Weight: 294 g
-Pin Wall Thickness: 0.160"
12.5:1 Piston will work with 91+ Octane Pump Gas. 13.5:1 Piston requires 110+ Octane Race Fuel. Pistons are a 3-Ring Design (same as TRX450R Piston), and have two compression sealing rings. We typically recommend 2-Ring Pistons for most racing applications, or other applications where customer / builder is looking for maximum engine power, as 2-ring pistons are lighter weight and have less cylinder wall friction, but 3-ring pistons do offer improved "durability". 3-Ring Pistons offer improved durability due to the 2nd compression ring offers slightly better oil control over after longer duration running periods on the engine (a 2-Ring Piston Design might start burning engine oil due to loss of ring seal / oil control sooner than a 3-ring piston design, as the 2nd compression ring does provide additional oil control to prevent engine oil from getting past the piston rings).
Replacement Components:
Replacement Ring Pack:
-JG5001-3898 (Fits All Pistons)
Replacement Wrist Pin:
-748-2050-16-93C (Fits All Pistons)
Replacement Wrist Pin Clips:
-748-050-MW (Fits All Pistons)
