The KDX service manual says to clean the muffler every 1000 KM
Not sure what that means, surely not driiling out rivets on the spark arrestor, it would have been made to come apart easier if it was a service item!?
My understanding is that the stock pipe (spark arrestor) is packed with exhaust packing material. When this is in a poor state back pressure is reduced and therefor proformance suffers.
Clean Muffler?
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