XPR Performance Services

Maximizing performance is what we do.

Whether you're on a budget or you're the serious racer we can help you get the most out of your ride. From full race engine builds, Cylinder porting, Engine rebuilds, Dyno tuning, Crankshaft balancing, Transmission treatments, Engine coatings we are your shop.

Performance Porting

Increasing flow through intake PORTS and rapidly getting rid of the burned gases through the exhaust PORTS increases power.
 XPR has spent years flow bench testing, dyno tuning and track testing to come up with exclusive port designs for your 2 and 4 stroke MX engine. Our race proven porting has helped racers and teams around the world win races and MX titles. If you are looking to increase performance out of your MX bike, this is the foundation to gain reliable power.

  • Reliable Power
  • Increased Efficiency
  • Increased Horsepower
  • Increased Torque
  • Increased Throttle Response

Copper Valve Seats

Why Copper Valve Seats?
Valve seats draw heat away from the valves and conduct it into the cylinder head. This is just one benefit on how copper alloys will out perform the stock steel seats. When we install our custom copper valve seats into your high-performance MX bike there are many benefits. Precise port to seat profiling using CNC machining will help improve port flow. Improved valve control by minimizing valve bounce gives you longer valve life and reliability. Multiple valve seat angles helps improve gas flow with a smoother transition for these gases into the combustion chamber for more power. 

  • More POWER!
  • Longer valve life
  • Optimized port flow
  • Custom valve seat angles
  • Better heat dissipation
  • Optimized seat profile design   
  • Custom port to seat profile 


Dyno tuning services


We offer Dyno tuning services in house for your high-performance motorcycle. With today's fuel injected and carbureted motorcycles, tuning using our state-of-the-art dynamometer and dyno room gives a controlled environment. With clean circulating air to simulate on-track conditions, this allows repeatability between runs and precise tuning. This is the most accurate way to insure optimal performance out of your motorcycle. IF you are a race team, engine tuner, exhaust manufacturer, fuel injection tuner or just need to test new performance parts we rent our high tech dyno facility by the hour. Contact us to make your appointment

Transmission High Speed Tumble


The truth is, stock Transmissions are not as good as they could be. Get this little-known enhancement used by the pros for:

  • Smoother, faster, easier shifts under power
  • A longer lasting transmission with less wear
  • Increased shift confidence leading to faster times
  • Lowers operating temperatures

Transmission tumbling at XPR is a 5 stage process:

  1. Disassemble and inspection (We assure that the gears have no defects)
  2. De-burring (Get rid of burrs for smoother gear engagement)
  3. Peening (Surface hardening)
  4. Media tumble (for reduced friction)
  5. Reassemble