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Went to RideNow PowerSports in Las Vegas today and a lady was trading in her 2012 Ninja 250 for a bigger bike. The mechanic took it in to inspect it. I noticed the chain had a bout less than 1 inch of slack, close to 1/2 inch. I asked him it was too tight and he said it was too loose! I looked at him and told him that if it were tight then the suspension couldn't travel through its full range of motion. I said it must be for 250 Ninja cause 600cc bikes usually have around 1.5 to 2 inches and he told me 1/2 inch was about right for most all 600cc bikes too. He gave me this look like I was some idiot and said that you don't want it too loose as he's seen broken sprocket teeth.