Pro Series Piston

• Product Details

  Pro Series Piston

  As the leader in forged racing pistons, JE Pistons has applied over 75 years of experience to its wide range of premium forged pistons for dirt bike and other off-road motorcycle engines. Engineered, forged and machined 100% in the U.S.A., JE Pistons are designed for each specific engine and riding application to provide the ultimate combination of durability and performance. From the motocross track to the trail and everything in between, JE Pistons' performance is proven with every handful of throttle and wave of the checkered flag. Equip your bike with the best in forged pistons.

  • Forged in the U.S.A. using 2618 aluminum, yielding high tensile strength needed for high-demand performance applications.
  • Designed specifically for each engine and use application 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 U.S.A.

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• Fitment

• # Part Numbers

  Product Variant	Manufacturer Part #
  100mm / +4.5mm / 13.5:1	300112
  100mm / +4mm / 12.5:1	315163, 284670
  100mm / STD / 10.0:1	261524
  100mm / STD / 11.0:1	261525
  100mm / STD / 12.0:1	261526
  101mm / +5mm / 12.5:1	315164
  102mm / +2mm / 10.0:1	261527
  102mm / +2mm / 11.0:1	261528
  102mm / +2mm / 12.0:1	261529
  105mm / +5mm / 10.0:1	261530
  105mm / +5mm / 11.0:1	261531
  105mm / +5mm / 12.0:1	261532
  76.8mm / STD / 13.2:1	291515
  76.8mm / STD / 13.8:1	291516
  76.8mm / STD / 14.2:1	291517
  77mm / STD / 14.0:1	292760, 366827
  78mm / STD / 13.5:1	247607
  78mm / STD / 14.0:1	274178
  78mm / STD / 14.1:1	379029
  78mm / STD / 14.5:1	366506, 379030
  79mm / +1mm / 13.5:1	325013
  79mm / +2.2mm / 13.5:1	315167
  80mm / +2mm / 13.1:1	221772
  80mm / +3.2mm / 13.5:1	315168
  89mm / STD / 12.5:1	274221
  94mm / STD / 12.5:1	284679
  94mm / STD / 13.0:1	284680
  94mm / STD / 13.8:1	284681
  95.5mm / STD / 12.8:1	261534, 284753
  95.5mm / STD / 13.8:1	274541
  95mm / STD / 12.5:1	284685, 274173
  95mm / STD / 12.6:1	323897
  95mm / STD / 12.8:1	274183
  95mm / STD / 13.0:1	274174
  95mm / STD / 13.5:1	274175, 323898, 274184, 274209
  95mm / STD / 14.5:1	325287
  96.0mm / STD / 13.0:1	317238, 274180
  96.0mm / STD / 13.5:1	317239, 274181
  96.0mm / STD / 14.5:1	306332, 317240
  96mm / STD / 12.5:1	261965, 284666, 315158
  96mm / STD / 12.8:1	284855, 284682, 274189
  96mm / STD / 13.0:1	315159
  96mm / STD / 13.5:1	261966, 315160, 284856, 274190, 284667
  96mm / STD / 13.8:1	284684
  96mm / STD / 14.0:1	315161, 291513
  97mm / +2mm / 12.5:1	325022
  97mm / +2mm / 13.5:1	325023
  97mm / STD / 12.5:1	274185
  97mm / STD / 12.8:1	324910, 291510
  97mm / STD / 13.0:1	274186
  97mm / STD / 13.5:1	324911, 291508, 366510
  97mm / STD / 13.7:1	300213
  97mm / STD / 13.8:1	366828
  97mm / STD / 14.0:1	366511, 324912, 291509
  98mm / +2mm / 12.5:1	284668
  98mm / +3mm / 12.5:1	325024
  98mm / +3mm / 13.5:1	325025
  99mm / +3mm / 12.5:1	325026, 315162, 284669
  99mm / +3mm / 13.5:1	325027
  Single Compression Ring / 94mm / STD / 12.5:1	261546
  Single Compression Ring / 94mm / STD / 13.8:1	261547
  Single Compression Ring / 95.5mm / STD / 12.8:1	261967
  Single Compression Ring / 95mm / STD / 12.8:1	261544
  Single Compression Ring / 95mm / STD / 13.5:1	261545, 261555
  Single Compression Ring / 96mm / STD / 12.8:1	284683, 262283
  Single Compression Ring / 96mm / STD / 13.5:1	262284
  Single Compression Ring / 97mm / STD / 12.5:1	274187, 308474
  Single Compression Ring / 97mm / STD / 12.8:1	291507, 324915
  Single Compression Ring / 97mm / STD / 13.0:1	308475, 274188
  Single Compression Ring / 97mm / STD / 13.5:1	308476, 291511, 324914
  Single Compression Ring / 97mm / STD / 14.0:1	291512
  Single Compression Ring / 99mm / +3mm / 12.5:1	325028
  Single Compression Ring / 99mm / +3mm / 13.5:1	325029

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