They are all similar on the little Ford tractors but the 800 series should be a larger unit. I see a lot of parts for these on flea-pay and other sources since they were a very popular tractor. I have an older 850 with a 5-speed and it gives very little trouble. The shut off valve on the fuel tank likes to leak every now and then but I use aircraft o-rings made of flourocarbon elastomer to seal it instead of the usual nitrile type. Any engine repair shop should be able to put a kit in the carb if you order one in. They are very simple carbs. Parts and Service manuals are readily available for all the 800 series.