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ttreewalkerr

Muffler pack for wr426 stock exhaust

7 posts in this topic

I have a 2002 wr426, its very loud with stock exhaust. I removed the 3 bolts on back of muffler to see if I could re-pack,, looks like an empty chamber with not a structure that looks like it accepts pack. So my question is, do these take pack ?

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I believe that is just the spark arrestor. Repacking the actual core takes further dissasembly. I'd refer to your owners manual.

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Looks like no pack in these, just chambers. Man stock muffler is loud. I see there is a plug for the end which is a stinger type tip, little quieter with that in.

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Is there something like this picture in the end?  If not, it will be very loud.  With it, it's not as bad.  They came with something we call a pea shooter.  Very small and restrictive hole, everybody tossed it.  

The stock muffler has some packing around a mechanical baffle, not something they designed to be repacked.  You would have to cut it apart to repack it and weld it back together.  

I have an 01 wr250f which uses the same muffler.  I put an FMF megabomb and Q4 on it and it's quieter.  That was louder than I would have liked and needed to be repacked too often.  So I took out FMF's glass pack and welded in the stock baffle assembly from an 09 450.  Much better.  

 

IMG_4127.JPG

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I have a 2002 wr426 and made mine street legal. just like yours and too loud. I took out the spark arrester assemply (three bolts) and used steel wool to pack the whole inside. used a broom handle to compress it to the sides so that the spark arrestor assembly will fit back in. I have mine packed really tight and it has been working great for the past 4 years. You might have to adjust the carb because of the more restriction of the exhaust flow but it worked great for me. I used steel wool because I had some but you could just use muffler packing.

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Thx. I may create a cage to hold the pack against the outer wall. So it will be 1/2" of pack, and create almost no restriction.

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