CARB CARBURETOR REBUILD KIT FOR MCCULLOCH 605 610 650 3.7 TIMBER BEAR SILVER EAGLE CHAINSAW ZAMA RB-18 Superior Quality Aftermarket Carburetor Rebuild Kit Made to meet or exceed OEM specifications. Replaces Zama RB-18 MCCULLOCH 300463 Complete kit, includes diaphram, welch plug, screen, needle & inlet lever. OK for use with fuel containing up to 25% Ethanol