Is it ok to ride a Yamaha blaster without the back half of the exhaust pipe?

it will run, but the removal of exhaust components can result in a decrease in the system back pressure. That can cause a problem with proformance, and may lead to problems with the motor. It is a matter of making sure the amount of air going into the motor and out are right. If you are going to take it off, check to see if the air in is okay to the air out. it probably won't cause a problem, but thought you know that they can happen. hope it helps. duboff