Post by jes on Jan 16, 2017 20:14:14 GMT -5
The exhaust gases leaving your engine exits the pipe in waves that travel through the muffler/silencer. Packing (typically fiberglass) around the pipe outlet helps the muffler/silencer control those waves as they leave your bike.
As you can imagine, the packing inside gets old, burns up and often exits along with those waves. On a two-stroke, the muffler/silencer’s packing ages because of the unburned fuel/oil mix that leaves the cylinder. On a four-stroke, heat is the main culprit that kills muffler/silencer packing. When it’s gone, your bike gets louder, neighbors complain, and its performance degrades (something that most people probably don't realize).
It happens very quickly. There are a number of mechanics who recommend new muffler/silencer packing after every 10-hours of riding. That could be once a month, or even more frequently for our hard core riders. FMF recommends repacking your muffler/silencer every 20-30 hours of normal use when properly jetted, and even more frequently if your jetting is less than optimal.
I'm betting that many of you don’t believe you really need to replace the muffler/silencer packing (or at least not so frequently). But did you notice your bike getting louder? My guess is probably not. Unfortunately, the neighbors/home owners around our lease have noticed, and they've complained – and that is very bad for all RCDR members.
Repacking your bike’s muffler/silencer will add horsepower and throttle response to your bike. With a freshly repacked muffler/silencer, your bike will run like it did when you bought it (assuming all other maintenance is up to date). You’ll regain the power you lost when your old packing material wore out, and more importantly, you won't be a sound violator at the lease!