i just pulled my instructions out for my pipe (the e-series/pure polaris). It says polaris recomends repacking after every 10-12 hours! i have about 50 hours on mine and have not repacked it yet, and dont plan to till probably this winter!
Keeping them properly packed keeps the noise down and they work at their highest efficiency. You can buy the high dollar packing material from the pipe makers or use fiberglass house insulation. The harder you run the machine the sooner it will burn/blow out...
yeah what powerslider said. the packing burns out and when it does your not getting the proper back pressure and then bad things can happen over time, like valve wear! when i bought my 400ex used the guy was running stock muffler with no baffle whick meant no back pressure. the valves were **** after about 6 months and i put an e-series on when i got it. dealer said this was do to being run with stock pipe and no baffle!
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