This original Zama carburettor of factory quality guarantees optimal metering and precise mixing of fuel and air for your STIHL engine. Made of first-class alloys resistant to wear and to aggressive fuel additives, it provides stable operation at high revolutions, easy starting and maximum power in the toughest working conditions. Investing in the original component eliminates the frequent problems of unstable idling and loss of power, which is a common flaw of cheap replacement carburettors. Before fitting the new carburettor, be sure to thoroughly clean the inside of the air filter housing and replace the fuel filter in the tank to prevent early ingress of impurities into the sensitive jets. During assembly, carefully inspect the intake neck and the impulse hose, because any damage to them leads to "false" air being drawn in, which can cause overheating and serious engine damage. After successful installation, carry out fine adjustment of the operating mode according to the catalogue specifications. Key characteristics: Part type/size: Carburettor (Zama C1Q-S154B) Manufacturer: Zama / STIHL – original part Reference OEM number: 4128 120 0607 Compatible models: STIHL FS 450 STIHL FS 450-K STIHL FS 400-K STIHL SP 451 STIHL SP 471 Stock and availability of parts can be checked by sending an inquiry or by calling our phone number.