917289570 ((YTH 2348)(2010-04) (Sears)) Craftsman Lawn Mower - Instructions

Clean engine with a Gunk type product. Remove valve cover. Loosen bolts and remove old cylinder head. One bolt is located inside valve cover area. Remove old gasket and inspect and clean that surface. Attach new head with new gasket using existing bolts. Torque to 18'#s with a cross type pattern. Attach new rocker arms and push rods. Set valve clearance to .004 - .006. Attach valve cover with gasket. Check oil level. Start and let it warm up. Let cool remove cover then check valve clearance again. Replace cover.

I removed the fan shroud, the carb/manifold as an assembly,turned the carb upside down and removed the fuel bowl. I replaced only one jet. Not until this moment did I discover their were two jets in this nikki carb. I now have a second jet ordered and will install it Friday,hopefully. These jets are two different part numbers as one is a left jet and the other is a right one. Be careful when opening the fuel bowl as these jets are held in their bores by small O-rings, and nothing else. The brigg's and Stratton part numbers are 791501 for the left jet and 791502 for the right.