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Honda CRF250 PRO Piston Kit

Part Number 284664 (132897757)
$309.99 $325.99 SAVE 4%
Out of stock
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Description

As the leader in forged racing pistons, JE Pistons has applied over 75 years of experience to its range of Pro Series pistons. Pro Series® Piston kits feature purpose-built forging designs that reduce overall piston weight without sacrificing strength or durability. Internal and external strut braces significantly reduce stress on critical areas while ultra-flat ring grooves improve ring seal for better, sustained performance.

JE pistons are all designed, forged, and machined in-house, allowing control over every step of the piston-making process. JE Pistons 7+ decades of experience in high-level racing has led to offering premium racing features, including full billet construction, EN plating, and purpose-designed coatings, to name a few.

MADE IN USA

Fitment

This part fits the following vehicles.

  • 2004-2009 Honda CRF250R

Features & benefits

  • Forged in the USA using 2618 aluminum, yielding high tensile strength needed for high-demand performance applications
  • Proprietary Forged Side Relief (FSR) forging design minimizes friction and power loss
  • Engineered, forged and machined 100 percent in the USA
  • Je Pro Seal Rings Included
  • Low Friction Skirt
  • Hand Deburred
  • Race-inspired two-ring design promotes quick revving and throttle response for noticeable power
  • Designed specifically for Honda CRF 250R Engines to provide optimized performance durability
  • Proprietary Forged Side Relief (FSR) forging design minimizes friction and power loss with reduced skirt width and saves additional weight with a shorter wrist pin
  • Includes high-quality wrist pins, locks, and JE Pro Seal premium piston rings
  • Made 100% in the USA
  • Accumulator Groove: A specialty groove between the top and second ring provides added volume for blow-by gases. This helps reduce pressure between the rings, improving top ring seal and minimizing ring flutter at high cylinder pressures.
  • Pin Fit: The pin bore is precision honed to attain an exact pin clearance. Clearances typically range from .0003 to .0010 between the wrist pin and pin bore.
  • Skirt Coat: Skirt Coat reduces friction and wear on piston skirts and cylinder walls while simultaneously reducing operating noise

Specifications

3D Undercrown Milling No
Accumulator Groove Yes
Add-On JG7001-3071
Anodize Top Ring Groove No
Bore Diameter 78.00
Combo 2 No
Compression Height 0.748
Compression Ratio 14:1
Compression Ratio Actual 14.00:1
Contact Reduction No
Country Of Origin USA
Cylinder Head CRF250 2009
Deck Height -0.012
Double Pin Oilers No
DVGP No
Econo Undercrown Milling No
EN Plating No
Engine Honda
Engine Displacement 250 cc
Engine Stroke 2.055
Engine Type ICE
Exhaust Angle 10
Exhaust Depth .138
Exhaust Diameter 1.365
Forging Type FSR
Gas Distribution No
Industry Powersports
Intake Angle 11.5
Intake Depth .170
Intake Diameter 1.605
Lateral Gas Ports No
Mill Undercrown No
Oil Groove Width 0.05850
Oil Ring Thickness 0.0585
Pin Fit Yes
Piston Average Weight 155
Piston Head Type Dome
Piston Material 2618
Piston Series JE Pistons
Piston To Wall Clearance -0.002299
Piston Volume 0.50
Product Market Off-Road
Product Type Engine Piston Kit
Ring Set - Recommended JG7001-3071
Ring Set Included Yes
Ring Set Part Number JG7001-3071
Skirt Coat Yes
Smooth Crown Finish No
Thermal Crown No
Top Compression Ring Thickness 0.0341
Top Groove Width 0.03410
Tuff Skirt No
Ultra Dome No
Ultra Groove No
Ultra Groove Plus Gas Port No
Vertical Gas Ports No
Wrist Pin Length 1.650
Wrist Pin Material 9310 Nickel Carbon Steel Alloy
Wrist Pin Outer Diameter 0.630
Wrist Pin Wall Thickness 0.120

Warranty

30 Months

Magnuson-Moss Warranty Act

Legally, a vehicle manufacturer cannot void the warranty on a vehicle due to an aftermarket part unless they can prove that the aftermarket part caused or contributed to the failure in the vehicle (per the Magnuson Moss Warranty Act (15 U.S.C. 2302(C)).

California residents

WARNING: This product can expose you to chemicals including nickel, which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.

Carb Status

California carb status to be completed

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