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JE Pistons

The origins of what we know today as JE Pistons can be traced back to 1912 and the Los Angeles foundry of William Jahns Sr. and his company W.H. Jahns. Employing the tagline, “Nothing but Pistons,” the W.H. Jahns company produced pistons and semi-finished pistons until 1948, when Jahns Sr. retired. Meanwhile, Jahns’ son, William “Uncle Bill” Jahns Jr., started and had been working on his company Jahns’ Racing Pistons since 1947. Shortly after, the business became Jahns’ Engineering Pistons, and was finally shortened to JE Pistons.

Through the following years, JE Pistons’ technology evolved, from mastering casting technology in the 60s to researching and implementing forging technology in the 70s. Numerical Controlled (NC) machines were introduced to manufacturing in the early 80s, which was quickly improved to the use of Computer Numerical Controlled (CNC) machines and a proprietary piston design and machining program in the mid-80s.

JE Pistons has continued to evolve their manufacturing processes, currently offering racing pistons either off the shelf or fully custom. JE pistons are all designed, forged, and machined in-house, allowing control over every step of the piston-making process. JE’s 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.

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JE Pistons Yamaha YZF R3 13 to 1 Piston Kit Quick View
JE Pistons

JE Pistons Yamaha YZF R3 13 to 1 Piston Kit

$524.99
JEP371974
Engine Components JE Pistons Misc Powersports Piston Sets - Powersports Uncategorized
As the leader in forged racing pistons, JE Pistons has applied over 75 years of experience to its wide range of premium forged pistons...
JE Pistons Honda CBR 500R 67MM 12.0 to 1 Piston Single Quick View
JE Pistons

JE Pistons Honda CBR 500R 67MM 12.0 to 1 Piston Single

$314.99
JEP371971S
Engine Components JE Pistons Misc Powersports Pistons - Forged - Single
JE Pistons Honda CBR 500R 67MM 12.0 to 1 Piston Single
JE Pistons Honda CBR 500R 67MM 12.0 to 1 Piston Kit Quick View
JE Pistons

JE Pistons Honda CBR 500R 67MM 12.0 to 1 Piston Kit

$524.99
JEP371971
Engine Components JE Pistons Misc Powersports Piston Sets - Powersports Uncategorized
As the leader in forged racing pistons, JE Pistons has applied over 75 years of experience to its wide range of premium forged pistons...
JE Pistons (E21BMW 2014 S1000RR 80MM 13.5 to 1 Piston Single Quick View
JE Pistons

JE Pistons (E21BMW 2014 S1000RR 80MM 13.5 to 1 Piston Single

$329.99
JEP371970S
Engine Components JE Pistons Misc Powersports Pistons - Forged - Single
JE Pistons (E21BMW 2014 S1000RR 80MM 13.5 to 1 Piston Single
JE Pistons (E21)BMW 2014 S1000RR 80MM 13.5 to 1 Piston Kit Quick View
JE Pistons

JE Pistons (E21)BMW 2014 S1000RR 80MM 13.5 to 1 Piston Kit

$1,119.99
JEP371970
Engine Components JE Pistons Misc Powersports Piston Sets - Powersports Uncategorized
As the leader in forged racing pistons, JE Pistons has applied over 75 years of experience to its wide range of premium forged pistons...
JE Pistons Yamaha SIDWINDER R-TX TURBO 8.5 to 1 Piston Single Quick View
JE Pistons

JE Pistons Yamaha SIDWINDER R-TX TURBO 8.5 to 1 Piston Single

$339.99
JEP371844S
Engine Components JE Pistons Misc Powersports Pistons - Forged - Single
JE Pistons Yamaha SIDWINDER R-TX TURBO 8.5 to 1 Piston Single
JE Pistons Yamaha SIDWINDER R-TX TURBO 8.5 to 1 Piston Kit Quick View
JE Pistons

JE Pistons Yamaha SIDWINDER R-TX TURBO 8.5 to 1 Piston Kit

$869.99
JEP371844
Engine Components JE Pistons Misc Powersports Piston Sets - Powersports Uncategorized
As the leader in forged racing pistons, JE Pistons has applied over 75 years of experience to its wide range of premium forged powersports...
Quick View
JE Pistons

JE Pistons Kawasaki KX250 F 14.4 to 1 78MM Piston Single

$314.99
JEP371309S
Engine Components JE Pistons Misc Powersports Pistons - Forged - Single
JE Pistons Kawasaki KX250 F 14.4 to 1 78MM Piston Single
Quick View
JE Pistons

JE Pistons Kawasaki KX250 F 14.4 to 1 78MM Piston Kit

$314.99
JEP371309
Engine Components JE Pistons Misc Powersports Piston Sets - Powersports Uncategorized
As the leader in forged racing pistons, JE Pistons has applied over 75 years of experience to its wide range of premium forged pistons...
Quick View
JE Pistons

JE Pistons MILWAUKEE 8 -4.250 / 1.080 Piston Single

$299.99
JEP370252S
Engine Components JE Pistons Misc Powersports Pistons - Forged - Single
JE Pistons MILWAUKEE 8 -4.250 / 1.080 Piston Single
Quick View
JE Pistons

JE Pistons MILWAUKEE 8 -4.250 / 1.080 Piston Kit

$449.99
JEP370252
Engine Components JE Pistons Misc Powersports Piston Sets - Powersports Uncategorized
As the leader in forged racing pistons, JE Pistons has been at the forefront of V-Twin and Harley-Davidson piston performance for decades, with over...
Quick View
JE Pistons

JE Pistons Milwaukee 8-4.125/1.080 Piston Single

$299.99
JEP370251S
Engine Components JE Pistons Misc Powersports Pistons - Forged - Single
JE Pistons Milwaukee 8-4.125/1.080 Piston Single
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