July 4, 201412 yr Recently had a look at the muffler on my '10 4rt and it appears that it is leaking a bit where the two ends are riveted into the main aluminum body of the muffler. This is my first four stroke bike..... I'd be interested to know how often I should expect to repack the muffler and also what is the difference between four stroke and two stroke packing? Do 4 strokes get louder like 2 strokes when it is time to repack? I've only had the bike for a couple of months and I'm not sure if it is louder than it should be or not.
July 5, 201412 yr Author Ah ha, Thanks Don!! I may just take it apart to reseal the seams then and call it good....
July 5, 201412 yr The 4RT does not have muffler packing and I have not noticed any real change in the sound as the years go by. When I heard yours last weekend in Revelstoke, it sounded normal to me. There is packing in the silencer, at the front pipe end it is a very dense material which tends not to burn out, the rest of the silencer body is a more conventional packing material. Probably worth packing it while you've got it apart. Use a good quality heat resistant silicone to seal it together. Normal silicone will burn out.
July 5, 201412 yr Author There is packing in the silencer, at the front pipe end it is a very dense material which tends not to burn out, the rest of the silencer body is a more conventional packing material. Probably worth packing it while you've got it apart. Use a good quality heat resistant silicone to seal it together. Normal silicone will burn out. The FMF packing that I've bought in the past for my 2 stroke was labelled as such, what might the difference be between the one marked 2 versus the one marked 4 stroke? I still have some of the 2 stroke stuff left over....
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