YZ500? Whaaaaa? - Moto-Related - Motocross Forums wr500 gas tank
Nov 02, 2010 · The production rule states that the bike must have the stock swingarm, frame, gas tank, cases, cylinder, ect. Yamaha also wanted to run the stock 490 gas tank, as it was slimmer than the over sized desert tank the WR had. The 490 gas tank was visually to obvious to run. The swingarm was a point of contention that year at the Nationals.
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