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Metric | JPrecision
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Unmatched Performance & Durability since 1983

JPrecision specializes in high performance machining of engines components. We let your local qualified mechanics to do the final assembly. Contact your local dealer for more details.

It only takes one pass on a dyne or a quick ride on an open road to fully appreciate the exceptional performance offered by JPrecision heads. Cylinder heads modified and upgraded by JPrecision are simply the most powerful and reliable that money can buy.

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3D Port Design

Using the latest CAD technology, we design and develop high flowing intake and exhaust ports for various Harley-Davidson™ cylinder heads.

5 Axis CNC Cylinder Head Porting

Our 5-axis CNC cylinder head porting center uses computer control to accurately replicate our best porting designs.

Valve seats machining

JPrecision high flow valve seat profiles are designed in house and are machined on a NEWEN CONTOUR CNC valve seats machine to give you the most accurate and efficient seat job in the industry, resulting in more power and durability.

JPRECISION offers a complete  cylinder boring & honing services.

Using state of the art equipment, the cylinder is first bored close to it’s final size and it’s then taken to our precision honing machine for final sizing and surface finish. Using precision measuring instruments,  we hone the cylinder for a perfect fit to the piston. Proper clearance allows for a better ring seal, longer life, and MORE POWER.

Unmatched Performance & Durability since 1983

JPrecision specializes in high performance machining of engines components. We let your local qualified mechanics to do the final assembly. Contact your local dealer for more details.

It only takes one pass on a dyne or a quick ride on an open road to fully appreciate the exceptional performance offered by JPrecision heads. Cylinder heads modified and upgraded by JPrecision are simply the most powerful and reliable that money can buy.

Find Dealer_EN

3D Port Design

Using the latest CAD technology, we design and develop high flowing intake and exhaust ports for various Harley-Davidson™ cylinder heads.

5 Axis CNC Cylinder Head Porting

Our 5-axis CNC cylinder head porting center uses computer control to accurately replicate our best porting designs.

Valve seats machining

JPrecision high flow valve seat profiles are designed in house and are machined on a NEWEN CONTOUR CNC valve seats machine to give you the most accurate and efficient seat job in the industry, resulting in more power and durability.

JPRECISION offers a complete  cylinder boring & honing services.

Using state of the art equipment, the cylinder is first bored close to it’s final size and it’s then taken to our precision honing machine for final sizing and surface finish. Using precision measuring instruments,  we hone the cylinder for a perfect fit to the piston. Proper clearance allows for a better ring seal, longer life, and MORE POWER.

Porting and Optimisation

The more you learn about High Performance engines, the more you will enjoy your motor heads modified JPrecision.
The result is maximum power, acceleration and durability that you can get yourself.

Adrenaline and Satisfaction Guaranteed!

Adrenaline
and Satisfaction
Guaranteed!

JPrecision offers the full range of machining services, call us for more informations.

CYLINDER HEADS PORTING

Raptor 660_Stage4_Head3
Raptor 660_Stage4_Head2

GENERAL MACHINING

CYLINDER HEADS PORTING

Raptor 660_Stage4_Head3

GENERAL MACHINING

Raptor 660_Stage4_Head2

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