REDS 521 Sport .21 Off-Road Competition Buggy Engine Combo w/2143 Tuned Pipe & M Manifold (Broken In)

The REDS 521 Sport .21 Broken In Off-Road Competition Buggy Engine Combo with 2143 tuned pipe and M manifold (REDKM210011), delivers a high-end balance of innovation, and quality, and performance - at a mid-range street price. The 521 Sport features technical changes in the 5 port sleeve, combined with updated materials to offer users high reliability, tuning stability, and fuel mileage. The 521 Sport guarantees excellent performance at a reasonable price.This combo has been broken in using a specific blend of oil for breaking-in nitro engines using the Oil Bath Lapping Machines. The pre-break-in process saves time, and fuel and increases the performance over the traditional break-in process. Only a quick, post-oil bath, break-in process is keeping you from experiencing quality and performance.Features: ALUMINUM CARBURETOR: 521 Sport engine includes the same aluminum carburetor as 721 engines to guarantee reliability and tuning stability. The insulator bushing has been improved with