Nitro Engine ZR.21 Spec.4 Pullstart

The performance-optimised ZR.21 Spec.4 engine stands for an unequalled power delivery, satisfying every demand. This perfect replacement tuning engine for existing .21 RTR engines features a special timing for even more power compared to its forerunner. And the engine still stays super easy to setup.

The perfect entry into the LRP Nitro engine world.



RRP: 109,99 EUR
(Recommended retail price)

Shop-price: 109,99 EUR
(Price incl. VAT, excl. shipping costs)

Pictures and videos



  • Replacement tuning engine for existing .21 RTR type engines
  • Best value for money
  • XTEC PowerCarb3 15S-2 carburettor - Flow optimised carburettor with 9.0mm inlet for maximum power and easy adjustability at the same time
  • Universal fit - Fits all major .21 engine mounts
  • 3 + 1 Ports
  • Standard burn room - Guarantees easy adjustment of the engine in all conditions
  • XTEC T6 engine housing - Especially reinforced heavy duty engine housing for toughest offroad action
  • Power Start capable - Prepared for the use of the LRP Power Start for starting the engine at the push of one button

Technical data

Cubic capacity .21 (3.49 ccm)
Bore 16.40mm
Hub 16.40mm
Power 2.15 HP*
RPM 35.300 RPM*
Number of ports 3 + 1
Glow Plug LRP Standard R5 (No. 35051)
Carburetor XTEC PowerCarb2 15S-2 with 9.0mm venturi
Weight 410g
Class 1/8th Offroad Buggys
* Figures may vary depending on used fuel, muffler and tuning

Spare parts
Tuning parts