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Standard is a main petcock and a reserve petcock. The main has a standpipe. For Norton, I recommend two reserve and only turn one on normally. This is because gas cannot get from side to side without significantly leaning the bike over. So, when the main runs out and you turn on reserve, there's still a lot of gas in the main side. Of course, if you know this and you run out the reserve, you can lean the bike over and move some from main to reserve.