By "giving out" do you mean it feels like not all the power generated by your legs is getting to the rear wheel? This can be caused by a chain that need oiling, pedals that stick or don't turn easily, badly adjusted gear set (that doesn't have the chain riding in the middle of each gear, but off to one side or the other). Do you notice any chattering or scraping noises when you ride?
Also, make sure your seat is adjusted correctly. To get full power, you leg should be almost straight when you are sitting on the bike and the pedal is at the bottom of the stroke. If not, raise the seat until you can just touch the pavement when the bike is tilted (as at a stoplight). Also, make sure the tires are inflated correctly. Overly soft tires take more work to get to your destination.
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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