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Traxxas Original Equipment Parts

Traxxas TRA5207R 2.5R Engine with Pull Start IPS Shaft

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This is the Traxxas 2.5R Racing Engine with IPS (Integrated Pilot Shaft) and Pull-Start. It is for use in all Traxxas vehicles that use the TRX 2.5 engine.

This engine is a .15 engine. The 2.5 refers to a measurement of Cubic Centimeter displacement compared to Cubic Inch displacement (.15).  It has 60% more power that the TRX Pro .15 engine! It is loaded with advanced features such and the free-flowing rear exhaust, the unique composite slide carb, and innovative porting only found on the most exotic racing engines.


  • Slide carburetor provides less restrictive, straight through airflow for more power and better throttle response.
  • PowerTune head is machined from aluminum which promotes even heat distribution for stable engine temperatures and rock-solid tuning
  • New sleeve for improved engine efficiency and better power.
  • Molded head protector prevents damage to the head and secures the glow plug wire.
  • Ultra-low restriction air filter provides superior air flow and filtration for more power and a long engine life.
  • Offset wrist pin further reduces piston slide loading for more even cylinder wear and longer engine life.


  • One 2.5 (0.15cu in) Engine with Pull Starter w/flywheel nut
  • One 90 degree air filter (includes base for upright mounting)
  • One 22 chapter Engine Set-up DVD
  • One Owners manual/instruction booklet
  • One bottle of air filter oil
  • One Decal sheet
  • One pre-installed glow plug


  • Muffler (exhaust system) depending on vehicle
  • Starting equipment
  • Nitro fuel


  • Displacement: 0.15 cu in (2.49cc) 
  • Crankshaft Thread: 5mm (.197")
  • On-Center Mounting Holes, Front to Rear: 11mm (.433")
  • On-Center Mounting Holes, Side to Side: 31.4mm (1.24")
  • Back of engine(recoil)to front of drive washer: 73.2mm (2.88")
  • Height: 97.3mm (3.83")
  • Exhaust Port Diameter: inner - 9.9mm (.392"), outer - 13.0mm (.512")