ATV/Motorcycle Silencer Repacking Instructions - muffler packing

[1PSYTEX1]

exhaust wool is fire retardant right?

[RockyMountainATVMC]

@1PSYTEX1 - yes, to some degree. it is mostly there to protect the rest of the exhaust from heat. It doesn't burn up as fast as other packing material can.

[raptorandblaster]

hey. i have a 2003 yamaha raptor 660 and was wondering what would be the best slip on pipe for it. im looking for sound mostly like what would be really loud and also give me power. also will i have to rejet it if its just a slipon?

[RockyMountainATVMC]

@raptorandblaster - I would recomend the Lexx. It is tunable so you can open it up. any time you open up exhaust or intake it will effect jetting; so you may need to go a little richer.

Regarding the "loud" keep in mind that you only want to be loud where it won't affend anyone. Noisey bikes and ATV's don't help to keep riding places open. thanks!

[lankysamboy94]

what silicone do you need.



[RockyMountainATVMC]

@lankysamboy94 - high temp. We sell a couple options from permatex on our site.

[ploppinpigeon]

To buy one new do u have to assemble it together or is it together

[RockyMountainATVMC]

@ploppinpigeon - a new exhaust will be together and ready to go!

[bombmaker2]

Anybody got any tips on disaasembling a fmf shorty that seems to be rusted together?

[ben1996ful]

is it normal for smoke to come out of the exhaust after the bike has stoped after the muffler has been repacked

[WaRR10R350]

for 2 stroke dirt bikes, if its leaking a little oil out the back of the silencer is that a sign that it needs replaced too?

[RockyMountainATVMC]

@WaRR10R350 - That is a sign your jetting is too rich somewhere.

[Kstixxx]

thumbs up for this video being 4 mins and 20 secs long...420!!!

[gwk4657]

I liked your video very much.

[johndevinaspre676]

i just bought some lexx repacking material from you guys for my pipe and its not this one its the cheaper kind but iv heard people say to wrap steel whool around the core before wrapping the packing or the packing will blow out quickly is this true? if you could reply it would be appreciated

[RockyMountainATVMC]

@johndevinaspre676 - steel wool will make it last longer, but not as quiet.

[emoskater1212]

@RockyMountainATVMC how do you know when to replace your packing

[RockyMountainATVMC]

@emoskater1212 - when sounds a little loud. Or every 30 hours of use or so.

[RockyMountainATVMC]

@johndevinaspre676 - steel wool will resist heat better, but isn't as good for sound. i don't know the specifics on what type or size of steel wool to use.

[MastaSquidge]

@RockyMountainATVMC Steel wool is flammable, just a heads up.

Take a 9 volt battery and rub it on the steel wool and you will have a fire in your hands. Used to do it in boyscout meetings...

Anyways, a friend of mine made his own exhaust for a 50cc scooter and after only a few miles it started launching clumps of flaming steel wool. And yes, it wasnt a well designed muffler, but fiberglass lasted much longer.

Just a thought, im sure there are some types (grades?) that wont catch fire.

[RockyMountainATVMC]

@MastaSquidge - I did that in scouts too! Most OE 4-stroke exhaust cores are wrapped in steel wool. I don't know what temp it burns at, but it must be OK for the most part.

[MastaSquidge]

@RockyMountainATVMC well, so long as people take caution.

[hammerheadZ1]

@RockyMountainATVMC do you have to put a silencer on an aftermarket exhaust?

[RockyMountainATVMC]

@hammerheadZ1 - every bike should have a silencer (muffler).

[RockyMountainATVMC]

@yamaha250Frider62 - If you stripped the head of the bolt, you will need to come up with another way to get the bolt out. you may need to drill it and use an easy-out.

[Learnthethingsido]

@RockyMountainATVMC Takea Dremal Grind 2 oposet sides of the bolt and take a Paid of Vice gripp's and clamp the screw and start unscrewing it.

[Peterrides]

i have a kx85 and it needs a good repacking job.. Should i use regualr packing or could i use the fmf packing as well?

[RockyMountainATVMC]

@Peterrides - either will work fine.

[Learnthethingsido]

@Peterrides Insulation works too. Fiber Glass R11 insulation will work.

[Calikid42O]

Dude I got this exhaust yesterday

[MrMotorider15]

i just bought a fmf 4.1 system and was wondering if i need to put that high temp silicone before i ride its brand new i havent even got it yet.

[RockyMountainATVMC]

@MrMotorider15 - On the seams? That should already be done by FMF. At the points they connect? A little high temp silicone never hurts.

[happywombatproducts]

ive seen people do this with steel wool...is it the same? does it really make a difference?

[RockyMountainATVMC]

@happywombatproducts - yes it makes a difference. Steel wook is used on some bikes right around the core, then packing around it.  The steel wool is better for real high heat - it won't burn out as fast.

[happywombatproducts]

@RockyMountainATVMC so wouldn't it be better for a 2 stroke? because me and my friend are planning on repacking his FMF silencer

[RockyMountainATVMC]

@happywombatproducts - No. I would use the premium packing we use in this video.

[happywombatproducts]

@RockyMountainATVMC allright thanks

[Christian8507]

might be dumd but after im done riding,so kind of smoke comes out of my pipe,i have a 2stroke is it the packing that is burning?that is after the motor is dead

[RockyMountainATVMC]

@Christian8507 - just the oil in the pipe still smoking.

[green2stroke]

@RockyMountainATVMC hey

[RockyMountainATVMC]

@yamaha250Frider62 - thanks!

[owengilbert]

do u have to use silocone??

[RockyMountainATVMC]

@owengilbert - i highly recommend it.

[ghat13]

I'm trying to repack my FMF Shorty silencer but i cant get anything apart! I took the 3 allen head screws off the end cap but it will not come off. I scraped off all the silicon on the outside, sprayed WD40 along the edge and let it sit, then tapped on it with a mallet. Then I drilled out the rivets in the front but i cant get the heads off. Nothing will move at all.  It's a mess, please help!!!

[RockyMountainATVMC]

@ghat13 - i would try a little heat from a propane torch very carefully.  That should loosen it up.

[RockyMountainATVMC]

@milojhanju - Forty years of darkness! Earthquakes, volcanoes... The dead rising from the grave! Human sacrifice, dogs and cats living together... mass hysteria!

Ok, Ok. Actually just a loud machine and some performance loss.

[MrTinman818]

Hey there. Thanks for the video! I'm going to repack the two stock mufflers on my 06 Ninja 250 and I'm pretty sure I should replace the cores as well. The previous owner let the bike sit and rot for a few years. Do you sell them as a kit (with the packing materials and the core)? And if so, are there different sizes to fit different bikes? Thanks.

[RockyMountainATVMC]

@MrTinman818 - Cores are pretty specific to the exhaust. We don't sell cores. I am betting yours are fine, I haven't seen too many go bad. The stock exhausts on that bike may may be "chamber" style and not take packing the same way you see in the video. You will be able to tell when it is apart. good luck.

[MrBrucerx7]

Where can I find one for my 2-stroke pocket bike?? Please reply

[RockyMountainATVMC]

@MrBrucerx7 - where can you find what?

[MrBrucerx7]

@RockyMountainATVMC a silencer for my mini bike 2-stroke i need a website or if you no how to make one please tell me.

[RockyMountainATVMC]

@MrBrucerx7 - who sells your brand of mini bike? That is who I would check with. If it is some off-brand Chinese bike, you will most likely have a hard time finding one.

[MrBrucerx7]

@RockyMountainATVMC yep its chinese and its an x1 pocket bike its mid sized the one u used in te vid is 1 that could word

[ezekielvictor]

might b worth noting that you should wait however many hours/days for the silicone to set before running ur bike through that exhaust.

[zachd242]

my hmf is leaking a little at the beginng of the pipe i just got it though and the said water hurts it is tht true?

[RockyMountainATVMC]

@zachd242 - I am sorry, but I don't understand the question!

[snowboardn4ever]

@zachd242 your a idiot.... of course water hurts it

[Mrwhitefolksjr]

This is so easy my 10 year old kid repacked the muffler on his yamaha 85 then I had him do it on my yz 450 ! he just read the cylmers manual and did a great job!

[robertgisthebest]

Hey man i have a big problem, only one end of my can is removable and the previous owner packed it that tight when he repacked it that the packing is jammed in and stuck to the sides and i can only get small clumps out, whats the best whay to get the rest out?, i tried a long bend screwdriver to scrape it out but im not having much success, any ideas?, oh yh forgot to mention, the packing material is soaked in oil so it cant easily be pulled out by hand.

[RockyMountainATVMC]

@robertgisthebest - I think you have the right idea with the long screwdriver. Or, can you drill the rivets and put new ones in?

[robertgisthebest]

@RockyMountainATVMC No, unforunately it's a stock one from an old machine and it's welded the other end, i have sort of fashioned a tool from a long flat blade screwdriver but it only reaches halfway, preserverance is the key i guess lol.

[glang67]

it really added power that you can feel when you roll down that throttle...

[glang67]

dude..where can I usually buy this type of packing???

[RockyMountainATVMC]

@glang67 - check out our website.  part # 1216150001.

[glang67]

@RockyMountainATVMC thats cool dude I already purchased one about 2 days ago...and I had already repacked my muffler too

[lateboy4]

Big thank you for this vid, Very well explained, very useful. You've made my day !!

[rama6maiden]

what is this good for??

[Osballs]

Well u sold me on it

[Osballs]

sweet and is the camera strong enough to withstand several crashes?

[RockyMountainATVMC]

@Osballs - if you land on it - most likely not.

[Osballs]

Umm it's just like a bunch of string...

And do uk where I can get a really nice helmet cam that has sound?

[RockyMountainATVMC]

@Osballs - yes it kind of looks like string. rocky mountain ATV/mc has a few camera options. I have been using he gopro HD and really like it.

[Osballs]

I have a pro circuit factory sound 304 and there is some sort of a string material stuck inside the canister nearsest to the end of the silencer... Do I leave it there or take it out?

And my core is slightly bent... Is that a big deal?

[RockyMountainATVMC]

@Osballs - I guess it depends on what is hanging out. It is worth pulling apart to see.

it depends on how bent it is. if it disrupts flow it will have an effect on power.

[50300]

ok, thank for the help

[50300]

ok thanks, and when you drill them out, the top part of the rivet will jus break of right? and you shake the remaining piece out?

[RockyMountainATVMC]

@50300 - correct

[50300]

when you put the new rivets back in, do you need sillicone at the end of em or do you just pop em in? cuz im doing mine in a couple days and i dont wanna fuck up.

[RockyMountainATVMC]

@50300 - i put silicone in the hole before putting the rivet in.

[Zeekon]

@RockyMountainATVMC what kind of packing is that? (I couldnt understand he said it to fast) and would that work with a 2 stroke pro circuit shorty

[RockyMountainATVMC]

@Zeekon - Lexx MXe Premium Silencer Packing. yes it will work on you 2 stroke as well as a 4-stroke exhaust. It comes with more than enough material to do your shorty 2 or 3 times. Cost is $14.99.

[worldskater31]

i dont think exhaust interferes with throttle response. JETZcorp

[JETZcorp]

On my bike, we just blasted the core with a torch, took the packing out and replaced it with nothing. Power is way up, and it sounds better when you give it the berries. Certainly not as friendly for riding around the neighborhood and that sort of goofy stuff, but we always ride way out in the middle of nowhere so the noise really isn't a problem. My other (smaller) bike just runs a straight stinger with no silencer at all. Totally illegal to ride it after June or so, but she sounds evil!

[RockyMountainATVMC]

@JETZcorp - I'll bet it sounds faster with packing out, but I doubt it is. The missing packing will cause a lot of turbulence in the silencer, which interferes with flow.

[JETZcorp]

Well, it's an older bike from the days when silencing wasn't that big of a deal, so that might be reducing that effect a bit. The silencer isn't even half the size of the one in this video.

And I KNOW it's faster, because before we removed the packing, it had a very bad throttle response. It was fine up to about 1/3 throttle, but after that it would start to burble and you could feel the acceleration being slowed down as more throttle was added. Now, though, it's got crazy top-end.

[brettwill87]

@RockyMountainATVMC does a fmf powercore 2 exhaust for a 2 stroke have packing if it does is it changeable thanks

[RockyMountainATVMC]

@brettwill87 - Yes it does have packing, and yes you can and should change it regularly.

[MuayThai8548]

@JETZcorp your an idiot have you ever heard of back pressure look it up about engines think of a pipe straight out of a car it would have low back pressure and a decrease in performance

[JETZcorp]

I'm sure modern bikes are designed to be fitted with mufflers with lots of packing and would be negatively affected by running a straight stinger. But my smaller bike was made in 1967, when no one even thought of putting mufflers on a bike. It's made to run open, and it does. We have a silencer that we occasionally put on it, and it destroys the power. Takes the most radical and torquey 115cc bike I've ever seen and makes it into a turkey. We found the same on my dad's '73 Yamaha 100MX.

[MuayThai8548]

well i agree things were different back then now theres tree huggers and such that wont allow open headers and stuff but on a 2 stroke the expansion chamber is designed in such a way where it rebounds and reflects pressures from the exhaust gases there for having an effect on the back pressure . same concept now your motor may be jetted to work without a silencer but its definatly not designed to work without an expansion chamber .if any issue its probally jetting then thats why you bike bogs

[JETZcorp]

I never said it didn't have an expansion chamber. In fact, originally it didn't come with one (this was back before they were on all the two-strokes) and when we put this pipe on it changed it totally. This pipe comes out of the port, does a 180, then the expansion chamber and stinger shoot straight as an arrow to the back. We have a silencer for it, but it restricts the exhaust flow a lot, looks hardcore stupid, cracks the pipe, and destroys the most beautiful engine noise ever known to man.

[KawasakiKX92]

good movie...

[18i]

Hey, nice vid! Im using some basic FMF packing now and am due for new one! I was wondering what are the difference between wool(what I have now), carbon packing, multi-layer and the premium packing??!

Is there anything performance wise?

[RockyMountainATVMC]

no difference on power. you want to acheive good sound absorbsion and good heat resistance. Multi layer packing does a good job with heat. The Lexx premium packing is the best we have tested for sound and heat.

[trailsallday4356]

in what way's is it bad for your bike if you dont?

[RockyMountainATVMC]

When packing burns out it leaves voids in the canister. This does a couple things. 1. it causes more heat from the exhaust to transfer to the canister. Heat can ruin the canister. 2. The void also causes more turbulence with the exhaust flow, which negatively effects the power.

[honda300ex03]

i have an hmf sport series exhaust is there a certain number of hours you should replace the packing? great video btw

[RockyMountainATVMC]

it depends on how hard it is ridden, but any 4-stroke exhaust (LEXX, HMF, FMF, PC, etc.) should be repacked every 25-30 hours of use.

[mulisharide033]

20-30

[m0t0cr0ss17]

what if it has rivits, mine is stock and has rivits

[RockyMountainATVMC]

Like the video says at 1:05, you will have to drill the rivets and re-rivet to assemble.

[m0t0cr0ss17]

yeah i under stand the drill part how do i re rivet though? never had to do that on my other bikes before

[RockyMountainATVMC]

You need a rivet gun and rivets.

[KanzlerM]

Or use Stainless Steel sheet metal screws in place of the rivets.

[RockyMountainATVMC]

Good call! i have heard that works great, but have never actually tried it.

[PowerAaron123]

so is it okay to leave the masking tape on?

[pixuma]

yes

[RockyMountainATVMC]

Yes it is. It is on the outside of the packing and won't be affected.

[JoshatSuzuki]

I'd already known how to do this, but it was pretty helpful anyway

[mxchamps]

Very nice.  Thanks!