To take out the air cleaner assembly and crankcase ventilation system you should start by disconnecting the accelerator cable bracket. Further, pop off the rocker arm cover screws and pry off the rocker arm cover from the engine, the gasket being discarded. The rocker arm shaft bolts need to be turned in a circular pattern with half a turn in-between until the rocker arm shaft assembly comes out, with some amount of care paid to lining up the pushrods so they are properly placed for reassembly. Next, get rid of the pushrods, for example. To install, use moly-base grease or engine assembly lube on the exposed ends of the pushrods and on the valve stem tips; place the pushrods in the appropriate holes in the rocker arms before placing the rocker arm shaft assembly on the cylinder head. Secure all rocker arm supports half a turn at a time until they touch the cylinder head and then torque to the indicated value in sequence. Adjust the valve clearance whenever required, and clean both the side of the rocker arm cover and the surfaces of the cylinder head gasket to fit a new gasket on the cover and all the tangs into the notches. Place the cover with all the gasket bearing surfaces clean; in the case of a distorted flange, use a hammer and a wooden block to correct it. Took the bolts to five foot pound and then again took the bolts to five foot pound after two minutes of interval. Last but not the least is the accelerator cable bracket followed by the crankcase ventilation system and the air cleaner assembly.