Dane you were right I needed to watch out for head gasket problems. The 550 started backfiring yesterday so I emailed Gulf Trackor and it is probably the head gasket. Gulf Tractor said that John Deere is aware of the problem and told Richard they would fix head gasket problems up to 500 hours no matter the length of the warrenty. So if anyone runs in to this problem John Deere will fix it.
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