Brand New Race-Driven Carburetor Intake Manifold Joint Boot, fits the following: 1987 1988 1989 1990 1991 1992 Yamaha YFM350 Big Bear 4x4. Steel reinforced rubber intake manifold replaces old worn out and cracked manifold ensuring a tight, air-leak free seal. Intake boots become dried out and cracked over time causing air leaks which lead to lean running engines that prematurely fail. Race-Driven is committed to bringing the highest quality products to all riders at an affordable price. Customer Driven – Quality Driven – Race-Driven.