Just needing a good tiller. On May 22, 2015 I bought a Belknap Inc. Bluegrass Hardware & Mfg. Co. (Model W7-BG387A B) Tiller from original owner's son. The B&S engine Model 130202 Type 0523-01 Code 76081607 or Manufactured on August, 16, 1976. While looking, tiller ran for a minute then stopped. I still bought it. Repaired the flywheel key the same day. After the repair, starts and runs great. Needs Carb, tank cleaned a little more, and muffler is on it's way. The sealed chain drive use 16 oz grease. Chain cover measures around 4" at top. The manual showed three chains under cover. Forward drive belt is 1/2 X 37" and Reverse drive belt is 1/2 X 41". Purchased belts at hardware store for $7-$7.50 each.
Looked online for three days for information. I finally found and purchased a manual from Ebay. This tiller was manufactured by White. Name is White Roto Boss 500 manual 990-105.