LRP ZR.21 Spec.4 Pullstart Nitro Engine

The LRP ZR.21 Spec.4 Pullstart (SCH-LRP32173) is a performance-optimised .21 nitro engine designed as a replacement tuning option for .21 RTR platforms. With special timing for increased power over its predecessor and a super-easy setup, it provides a strong entry into the LRP nitro engine range while delivering reliable, consistent performance for off-road use.

An XTEC heavy-duty T6 housing supports tough off-road action, while the engine is prepared for LRP Power Start use if you prefer starting at the push of a button. The Spec.4 combines accessible tuning with robust construction, making it suitable for drivers seeking a dependable .21 pullstart engine with proven race-bred features.

Features

• 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)
• Carburettor: 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.

Suggested Compatibility

• 1/8 off-road buggies (as suggested compatibility by the stated class)
• Vehicles using major .21 engine mounts (suggested compatibility based on universal fit)