Seeing that its an FMF I naturally looked to FMF packing. But then I remembered repacking my YZ250 and second guessing myself if I put enough packing or was the packing to loose or to tight.
Also for the length of the beta silencer I would need two packs of the standard FMF packing but only use about 1/3 of the second pack
so I thought that there has to be a better way.
searching youtube I found a video about Bristolcore packing pillows.
and thought wow that's a idea.
they make a stitched "pillow" of packing that comes on a card board tube
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So I started to look on there website about repacking FMF with their "pillow"
http://www.bristolcore.com/FMF_Repack_s/35.htm
on that page there is a paragraph that will help you choose that size you need.
As that Beta had FMF make the silencers I thought that It would be the perfect match.
turns out that Bristolcore did not make the right size for the factory Beta silencer.
I was bummed,
but I emailed Bristolcore to see if they can make custom pillows.
The guys at Bristolcore came to the rescue and said yes they do.
after talking on the phone I quickly relized that Bristolcore is the real deal. They are Riders that happen to make exhaust packing.
after getting them the measurements they need to make my pillow it took them a couple of days to make it and ship it out.
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as for the install it was fast simple and clean
take your silencer off and take it apart. clean out the old nasty packing and clean the inside of the silencer and the perforated core.
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then side the pillow and the card board tube on the perforated core of your silencer
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then side the cardboard tube out
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then just side the silencer back together.