Yard Machines 31A-2M1EB00 21-in 123-cc Single-Stage Self-Propelled Gas SnowYard Machines 31A-2M1EB00 21-in 123-cc Single-Stage Self-Propelled Gas Snow Blower with Pull Start. BRAND NEW – Inventory is in “BRAND NEW” retail ready condition and in original packaging. 30.00 x 21.00 x 24.00 in. Yup, we are confident in our refurbishment. Powered by a reliable 123.