Any Onan dealer or try a Cummins Power outlet (Onan is part of Cummins, they bought it for the generator business), Toro commercial/turf dealer, A RV dealer that does their own generator work or a John Deere Lawn & Garden dealer. If you do the google thing or go to one of the sites and get the part number there are several sets on Flea-bay but the ones with the best prices are ID'd by part number only. Onan parts are pricey why do you need head gaskets? To set valves should be able to get by with less and I think they sell them ala-cart. Stens might make them, in that case you could probably afford to do the work. IDK how the 24 HP engines are but the 22 have valve seat problems you might be looking at having valve seats installed or re-powering with another engine (Honda,Kohler or B&S)
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