This JE "Pro Series" piston kit is specially designed for demanding high performance applications and feature purpose-built forging designs that reduce overall piston weight without sacrificing strength or durability. The addition of internal and external strut braces significantly reduces stress on critical areas and improves ring groove flatness for improved ring seal during operation. JE Pro Series kits provide the performance needed by top engine builders such as Pro Circuit and JGRMX, with the durability required by weekend riders.
Internal and External bracing
Ultra-Flat ring grooves
Low Friction Skirt
Ultra light weight
Hand de-burred - Requires no de-burring or preparation
2618-T6 Forging
FSR Design
Pin, locks and JE Pro Seal piston rings included
SpecificationValue
Displacement
478cc
Bore Size
98mm
Oversize
+3mm
Compression Ratio
13.5:1
Piston Weight
287 grams
Skirt Style
FSR
Piston Ring Part Number
XS9800
Wrist Pin Part Number
787-2050-16-93C
Piston Circlip Part Number
787-050-MW
Brand
JE Pistons
UPC
193564027610
Fitment information
Yamaha Models
Yamaha YFZ450 2006 - 2013
Yamaha YFZ450R 2009 - 2020
Yamaha YFZ450R Special Edition 2016
Yamaha YFZ450REL Team Yamaha 2014
Yamaha YFZ450RSE 2017 - 2020
Yamaha YFZ450RSE Special Edition 2009 - 2015
Yamaha YFZ450RW Custom Graphics 2012 - 2013
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