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.
Step 2. Clear all vegetation from the area being seeded in late winter or early spring. Apply the pre-emergent herbicide to the soil in late March or early April. The herbicide must be applied prior to sowing grass seed as it can inhibit seed germination and growth.