Rotary 2749 Piston Assembly "F" Engine Lawn-Boy by Rotary $26.03 Sold out 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Sold out PRODUCT INFORMATION Type Engine PRODUCT DESCRIPTION DESCRIPTION Lawn-Boy Standard F - Engine Piston & Ring Set. Piston has a small hole in the top. It is a compression release. REPLACES OEM LAWNBOY 682986, 92-4923