Easy to install, the manual is not inlcuded, However, You may search some manual on tube. The only thing they need to change is one of the gasket that is included needs to be the one between carb and air filter housing. After installation, It instantly fires up, Your Powerful mowers & Equipment deserve A Perfect Carburetor Suitable for stihl bg45 bg46 bg55 bg65 sh85 blower zama c1Q-s68G carburetorCarburetor replaces your old OEM. To replace an existing carburetor, simply replace and ride again. Give your machine the new power and torque you really deserve, and enjoy more fun with new power at your fingertips. brand new. 1 carburetor.