When using the single-vacuum distributor, the vacuum hose runs from the vacuum port on the left side of the carburetor to the vacuum canister on the distributor. In that case, the vacuum port on the rear of the carburetor must be plugged.
For most cool season grasses and for folks living in northern climates, the best time to plant grass is in late August, early September. Depending on exactly the climate you have and the type of grass seed you're planting.
Plant cold weather grass in late spring or early summer. Planting in the late spring allows bromegrass to establish and bloom before the heat of summer, while planting in late summer allows it to establish and bloom before the cold of winter. Plant bromegrass in a moist, firm seedbed.