Unmatched performance & durability since 1983.

J Precision 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.

Ducati 2-Valve engines

We offer cylinder head work for all Ducati models; from valve seat installation to full race porting.

Performance Cylinder Head Porting

We offer head porting for a range of different applications, from mild to aggressive, from street to track. CNC porting is available on our dedicated 5-axis machine.

 

Ducati Pantah 350 / 500 / 600 / 650 conversion to 750 F1 style

Stage IV

The optimization for those heads includes:

  • Valve seat locations are machined deeper to accept the new oversize valve seats.
  • Original valve seats are replaced by high nickel bronze seats for the exhaust and high chrome alloy seats for the intake.
  • Combustion chambers are redesigned to a bath tub style and matched with the seats.
  • Spark plug hole is relocated farther from the valve seats and converted to 12mm.
  • Intake and exhaust ports are tig welded and reshaped for more efficiency.
  • Intake and exhaust ports are CNC ported for optimum air flow and velocity.
  • Installation of new AV&V manganese bronze valve guides.
  • Multi angle HP seat job is done on a Newen CNC machine.
  • AV&V Extreme Duty High Flow valves and AV&V high temp. resistant valve seals.
  • Intake manifolds are ported and matched with the intake ports.
  • The heads are washed in an ultrasonic bath and are ready for reassembly.

 

 

 

 

 

 

 

Ducati 750 / 800 / 860 / 900

 Stage IV

 The optimization for those heads includes:

  • Original valve seats are replaced by high nickel bronze seats for the exhaust and high chrome alloy seats for the intake.
  • Intake port is tig welded and reshaped for more efficiency.
  • Intake and exhaust ports are CNC ported for optimum air flow and velocity.
  • Installation of new AV&V manganese bronze valve guides.
  • Multi angle HP seat job is done on a Newen CNC machine.
  • AV&V Extreme Duty High Flow valves and AV&V high temp. resistant valve seals.
  • Intake manifolds are ported and matched with the intake ports.
  • The heads are washed in an ultrasonic bath and are ready for reassembly.


 

 

 

 

 

 

 

 

Ducati 696 / 796 / 1000 / 1100 / 1200

Stage IV

The optimization for those heads includes:

  • Original intake valve seats are replaced by high chrome alloy valve seats.
  • Intake port is tig welded and reshaped for more efficiency.
  • Intake and exhaust ports are CNC ported for optimum air flow and velocity.
  • Installation of new AV&V manganese bronze valve guides.
  • Multi angle HP seat job is done on a Newen CNC machine.
  • AV&V Extreme Duty High Flow valves and AV&V high temp. resistant valve seals.
  • Intake manifolds are ported and matched with the intake ports.
  • The heads are washed in an ultrasonic bath and are ready for reassembly.

 

 

 

 

 

 

 

Ducati EVO 1100

Stage IV

The optimization for those heads includes:

  • Intake port is tig welded and reshaped for more efficiency.
  • Intake and exhaust ports are CNC ported for optimum air flow and velocity.
  • Installation of new AV&V manganese bronze valve guides.
  • Multi angle HP seat job is done on a Newen CNC machine.
  • AV&V Extreme Duty High Flow valves and AV&V high temp. resistant valve seals.
  • Intake manifolds are ported to 40MM bore oversize and matched with the intake ports. O-Ring is installed.
  • The heads are washed in an ultrasonic bath and are ready for reassembly.
  • Gasket face & squish angle deck machining are offered in option

 

 

 

 

 

 

 

Cylinder Head Rebuild

We clean and bring back your old Ducati heads to OEM specs. This package includes new valve seats, head milling and Ultrasonic bath cleaning.

Cylinder Head Conversion

We can take your early Ducati Pantah cylinder heads and convert them to later specification (smaller spark plug, revised combustion chamber and larger valves).

From casting repairs to combustion chamber renovation we have the equipment, tooling and expertise

J Precision offers the full range of machining services:

To download our Ducati 2-Valve engines machining services catalog , click here:

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