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.
Seed warm weather grass seeds in early spring and into the summer. Wait until temperatures get above 65Â°F during the day and then seed. This will allow the warm weather grasses to get the benefit of warm temperatures that come with summer while giving them time to become established prior to cooler weather in the fall.