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How long should they last...black widow kart.136cc. 30 series knock off pulleys.our 2 carts are burning thru these bushings very quickly.everything is clean and dry lubed. The last bushing lasted two 20 min runs. We were on flat road. Also any reasons they would burn prematuely ?

Hello everyone ! My name is sean. Our family recently purchased 2 black widow carts from sears. We have a blast. I am a heating and air technician.some belt and pulley knowledge. But still learning the hard way it seems with our torque converters. If anyone has any off topic questions about hvac...