Oftentimes a model number that is very similar simply denotes a color or packaging difference or the accessories packaged with the unit. Also, different stores will carry slightly different model numbers that are unique to their store so that they can avoid having to price match since the exact same model number won't be sold anywhere else..
Look at the sidewall of both tires. There will be a 'MAX PSI' embossed on the tire. It will probably say Max 45 PSI. At 45psi the bike will ride like a rock. At 15psi it will ride really squirrely. Find a psi at which you feel the bike handles well and rides well. One rider may weigh 125 pounds and the next rider may weigh 300 pounds. The best psi for each rider will be different due to weight. Chances are that 30 to 35 psi will do the trick. A Yamaha dealer should be able to get you a manual. Please take a moment to rate my answer. Thanks.
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