Abstract: A lawn mower includes a cutting deck with first and second cutting blades to form clippings beneath the cutting deck and a baffle system to direct the clipping through a discharge opening. The baffle system includes a baffle wall that at least partially surrounds the first and second cutting blades to define first and second cutting chambers. The baffle wall includes a front baffle wall portion having a front guide surface to guide the clippings from the first and second cutting chambers towards the discharge opening, and a rear baffle wall portion having a concave guide surface and an end positioned between the first cutting chamber and the discharge opening. A discharge transition area is positioned between the first cutting chamber and the discharge opening.

Abstract: A cylinder head (10) for an internal combustion engine has hydroformed port liners (18) positioned within selected ports, either exhaust and/or intake ports (14, 16). The hydroformed port liner (18) includes an air gap (24) for an insulation layer within the selected port (14, 16) between an outer surface (19) of the hydroformed port liner (18) and the wall of the port (14, 16). A cylinder head (12) with a predetermined port configuration has selected ports (14, 16) cast with protrusions (22). The selected ports (14,16) have a larger diameter than a standard size port diameter for that cylinder head to provide a predetermined port configuration by a preset amount based on the thickness of the hydroformed port liner (18) and a desired air gap (22). Protrusions (22) in the wall of the selected ports (14, 16) or on the insert sleeves (17) facilitate formation of the air gap during the hydroforming process.