repacking stock silencer-dB ??

Here's my new strainer.....ah spark arrestor View attachment 80266 View attachment 80266

Dam phones....

I too would like to make my '86 400 as quite as possible. I repacked the spark arrestor but I think I may need to add more packing. I was also going to experiment with wrapping the expansion chamber with a silicone baking mat. I'll let you know if that makes any difference.

screen type arrestors dont do much of anything for sound..some spark control and they like to plug up.

note the first wr watercoolers had a two piece cover to the main pipe with glass packing under it

84 aircooled WR 240 has the outer shell covers over the expansion chamber also

they did too

All of mine over the years have had them, 1986 and two 1988's.
Tony.

Happy New Year Everyone!

I need some advice. I'm rebuilding the stock silencer for my 1983 WR 250. Any suggestions on cleaning out all of the perforated holes on the long welded screen tube inside the body? Solvents? Special sandblasting tip? I would rather not have to cut this thing open.

Cheers!

wirewheel, a tiny phillips screw driver and a 6 pack of your favorite brewski. poke the carbon out of every little hole with the screw driver and get the rest off with the wirewheel.

his problem is the pref tube is welded into the silencer tube...try soaking in a caustic soda brew, can soften the carbon...TAKE ALL SAFETY PRECAUTIONS...Na Oh will remove many layers of skin and render eyeballs obsolete....

other option is the oxy torch up the cloaca of the pipe trick and get her reeeedd hot then tap it with a solid instrument to shake it out. NOTE it will stink the place out something shocking and ruin your immediate relationships....wife, kids neighbors and possibly the fire dept ....you have been advised

go camping and build a biiig campfire and use that....ive done this with good results.

Build a fire and toss it in for about 1/2 hour

Note for future thought, if we port and polish the exhaust it does raise the exhaust level a tad.

Really - toss it into a fire for 30-minutes? Never heard of that - it sounds almost too simple. When I take it out of the fire, I assume some tapping with a hammer here & there will do the trick?

Yup...1/2 hr depending on how bad it is..i do the same thing with pipes..just did it last month to my 79 CR...same silencer set up you have with the welded in perforated tube...once all the oil burns out and it cools it should be dry and powdery...get in there with a bottle brush and you should be good to repack

Yep, squid correct. Heat with torch till powdery, then just wire brush it.