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i have a scag STG-18KH - 1993 modkhi have a scag stg-18kh with 18hp kohler engine. it starts good but after i start cutting grass for about 15-20 munites it gets hot and cuts off. i changed spark plugs and fuel filter and i have no idea what it could be. i attached the user and parts manual with this post. thanks for any help.

Replace your air filter.

http://www.kohlerengines.com/onlinecatalog/pdf/tp_2339_d.pdf your engine manual, see section 3 troubleshooting, overheating. If this is not your engine let us know please, thanks, just post model number.

Remove the shroud and clean out the mouse nest.