The later 990's had a fat little 15" tire, kind of like a rear lawn mower tread, early ones were narrow, rib 15". Probably needs new chain and possibly new sprockets, they wear and tend to jump, check tension first, may just be loose and flops a lot. Check the bars on the steel roll, they tend to break the welds, make sure and weld any broken welds. I had a 7' and a 9' 1976 models (later ones) Good machine....James
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