How To Fix a 2 Stroke Motorcycle Exhaust Leak

[@MaxwellBenson80]

Thank you for sharing your knowledge with us all! I am new to 2 strokes and got concerned with the black oil leakage. I appreciate videos like this that offer easy to follow tips and tricks for newbies. Thanks again!!!

[@_kieranwilliams]

I’m new to dirt bikes aswell, I bought a YZ 125 1998, it started leaking, I can’t find a rubber joint 🥲

[@aqua_stoppa4767]

Amen I started getting scared too

[@beauv2245]

Wow perfect timing for me I've been battling a leaky head pipe for a few weeks now. I'll definitely use the high temp silicone! Thanks for the video guys!

[@rmatvmc]

We're happy to help! Be sure to share with your two stroke friends, cheers!

[@timdavanzati7510]

Tip for anyone who doesn’t have a spring puller, and is a penny pincher like me😂😅… a wire or any tough string will work. Keeps your hand away from the springs, and you can use your weight to easily push down and take the springs off. Works great for me

[@idselseno2306]

After watching the 5 MOH series, I got myself a DT 125. I've been always looking out for Justin's tip like the overflowing carb. Now this fits nicely how I will fix my leaking pipe.

[@Scottstunts]

I've been using copper seal on my 2 strokes for a long time and it works great. Awesome video!

[@rmatvmc]

Nice tip. Thanks for sharing!

[@broo_shs]

peoples have use copper to seals all kinda stuff & in 80's my big brother made his tuned tunturi super sport a copper seals & i have use copper washers & seals in exhaust+many anothers part of engine + also in cars i use copper washers or self made seals and i swap every time new seal or washer when i swap oils or rear oils

[@FirstGendodgegarage]

@@broo_shs congrats to your brother coming out the closet !!

[@peytonmcadams7562]

I can't praise the spring puller enough. That thing has saved me hours of pliar struggle over the past year.

[@DakotaE57]

Peyton McAdams i use a shoestring🤣. Wrap it around the spring once and pull as hard as you can lol

[@jimarmbrester1721]

Peyton McAdams cheap trick is a piece of tie wire 4-5” long. Bend into a U shape, grab both ends with good vise grips, and works great. Could probably use a coat hanger in place of tie wire

[@nickkysix8500]

I use 18 wheeler air horn cable wire with a loop on one end, works awesome

[@EliteGamer21]

i use electrical wire cutters, the top has a little opening so it cant slip out

[@331moto]

Use 2 heavier duty zip ties. One around the spring and the second one thru the first one to use as a handle to pull the spring...

[@mwwalsh133]

LOL, @3:25 that radiator overflow hose is scorched meat from laying right on the header . Dude, you have got to ziptie that hose to the frame with the same black strap you use for the stator wiring.

[@Micscience]

Good Idea my cr125 hose touches my pipe.

[@RobertBraunschweigIV]

Perfect explaining. Thank you!

[@enduro-parts-aus]

good idea with the silicone will be trying this next time as my 300 tends to destroy orings fairly often

[@rmatvmc]

It works wonders! Thanks for watching.

[@RobertDamien8687]

@@rmatvmcwhat color silicone ?

[@migliaman]

Great video but sadly my vintage it175 only has a round asbestos gasket and no modern o rings so always tends to blow at the cylinder!

[@therealcaliswaggonpoint6457]

Thank you so much super helpful for a just time buyer of a KTM 65cc for my son

[@DH-mf2lv]

My PFR exhaust pipe doesn’t come with 0 rings. Any suggestions on how to stop the leaking where it joins to the engine? It’s on a 1976 CR Honda. Thanks for the video.

[@rmatvmc]

Replacing the three mounting springs and adding some silicone could help with the leak. We have many in-stock with part# 18332-357-010

[@rlima123]

Tnks for the video greatings from Brasil

[@rs15]

I took my pipe off to clean it and oil poured out, and a considerable amount at that. I did a top end recently and rebuilt the carb. The bike runs fine but I’m stumped and nervous. Any ideas? It wasn’t very spoogey and appeared to be gear oil as it was non-viscous.

[@FitJP777]

Thank you so much exactly what I needed 👍👍👍👍

[@cadwarrior]

great tips!! will try that on my cr250r!

[@rmatvmc]

For sure *cadwarrior.* Good routine maintenance! Thanks for watching.

[@cadwarrior]

Rocky Mountain ATV MC thanks to you!

[@rmatvmc]

Thanks for chiming in sir!

[@motomash6143]

What year cr250 do you have mate?? I've got a 1998 cr250r

[@StrategiseMarketing]

Great video! Now I can fix my KTM properly.

[@ceotrev4481]

Could I use yamabond as my high temp silicone??

[@mrbrenton182]

Hey awesome video!! My bike doesn't have any orings between the cylinder and exhaust. I have a KTM 360 97 model, is there anything further I could do besides the springs and hi-temp silicone? Thank you.

[@rmatvmc]

*mrbrenton182* - High Temp Silicone works great. Once cured and dry it seals up nicely. For your machine you should be just fine using that. Thanks.

[@Boorer_555]

I use a radiator hose and hose clamps for the pipe join on my 2strokes

[@bene9231]

Is HT silicone long term resistent? I fixed my leaking at my ktm tpi like in your video and it works perfect since 30 hrs. I am just a little bit afraid that it will get soft/fluid inside and I have some silicone in my engine afterwards. Or will it get burned anyway? Some long term experience out there?

[@Micscience]

That soft silicone won't hurt your engine. Even on a 2 stroke especially since it is on the exhaust side everything is being blown outward away from the engine and not toward the engine.

[@matthewmason6616]

can this prevent the bike from running properly? I have an old Yamaha I'm fixing up and it leaks where the head meets the cylinder

[@rmatvmc]

sealing it will make it run better. It was designed to run without the leak.

[@Walter-White23]

My ktm 85 has been laid up for awhile and I needed to get my carburetor cleaned as the jets got clogged and was a bog noise when reving . So now that's sorted I took it for a spin and basically when I put it into first gear it conks as soon as I leve out the clutch but yet when I run with it kick it to second it goes perfectly. Plz help 😢

[@breakroommanager1]

I just put a new fmf gnarly pipe and fmf turbine core 2.1 on my 2018 yz250x a few days ago and on today’s ride I now have the splooge problem once again (like I did on my last fmf equipped Yz) .And in addition to that , the silencer is leaking oil out of the rivets! Never had an issue with the stock pipes, but I’ll definitely try out the silicone trick. Any ideas on fixing the rivet leaks would be appreciated. Btw , my bike runs excellent and jetting is pretty spot on. Thanks in advance for your response. Btw, the spring puller looks epic!

[@That_redcummins]

You might be running rich too

[@mtbridingog9083]

Thanks for having the parts I need for my cr125 build #rockymountianatv #teamhonda

[@RidewithJaden]

Can you send me the link to the O-RINGS for a cr125 I cant find them anywhere?

[@mtbridingog9083]

Ride with Jaden o rings for what part ? I'm not sure what it's for on the cr125 also what year is it

[@drewsimicich1019]

Is the silicone a gasket maker?

[@rmatvmc]

The Permatex Silicone is a high temp copper silicone gasket maker - www.rockymountainatvmc.com/parts/permatex-ultra-copper-maximum-temperature-rtv-silicone-p

[@timdavanzati7510]

Thanks!!

[@robertharwood2506]

could that leak also indicate bad crank seals?

[@iAmMighty-Frieza]

Awesome video thank u appreciate it bro

[@Gavitar351]

U don’t have to drain any fluids to change that out do u?

[@rmatvmc]

No you don't drain fluids to do this.

[@wigglesthewiggler420]

Exhaust was leaking at the head, removed it and resealed it with high temp silicone, now my idle speed is way higher that it was previously for the same air screw position. Is this normal? have had to close it in quite a bit, in order to get the idle speed back to where it was previously?

[@chaz_bl3731]

Your idle will need readjusting because when the exhaust was leaking it caused a lean condition and the carb would have been adjusted to compensate so the bike would idle before , now the leak is fixed the engine runs differently so previous idle settings do not work

[@lorettacaputo6997]

@@chaz_bl3731 I have a polaris 2 stroke that was leaking oil from the exhaust port to the first exhaust pipe. I sealed the connection with high temp sealant, but now I could not get the motor to start up and idle correctly. I fooled with the idle slide screw on the makuni carb. I presume that this is just a need to adjust the air mixture screw until I can get the motor to start again and then adjust the air slide screw....correct?

[@cocaojcustomz6505]

I have a question, so I don’t have an exhaust leak but my cr85 is smoking somewhere near the head or something, is it that it needs coolant or can it be something worse?

[@codyreid1857]

Need o rings

[@lucasplekavic6332]

What was the tool I can use to get the springs off? And where could I get it at?

[@rmatvmc]

www.rockymountainatvmc.com/parts/tusk-exhaust-spring-tool-p

[@lucasplekavic6332]

Rocky Mountain ATV MC aprecciate you!

[@kirbylee57]

Seems like this information would be in Yamahas repair manual.

[@tylercotugno8387]

Would my pipe not meeting the cylinder properly cause my powerband not to hit?

[@obeebemahasee1130]

Yoooo mines doing that right now and I can wiggle the fatty pipe and it doesn’t seem connected. When it hits the power and it sputters. Ur comment was 9 months ago did you fix it and if so how?

[@801guitar3]

If you can see smoke coming out where the pipe meets the cylinder, are you losing any note-worthy performance?

[@leeham273]

its an exhaust leak, might affect top end performance, plus it just looks ratty

[@2clapsandarickflair804]

Can the mounts be fixed or would i just need a new fatty pipe?

[@bryanbavaria1216]

What brand and where do you buy the spring puller?

[@rmatvmc]

www.rockymountainatvmc.com/parts/tusk-exhaust-spring-tool-p Here's a link!

[@hondayamahafan]

Can a leaky exhaust at the cylinder decrease power and make it difficult to stay in the powerband?

[@Juicemann455]

If it’s leaking really bad Yes, but it’s more likely a dirty power valve. Clean up all the carbon and spooge and check for correct operation

[@hondayamahafan]

@@Juicemann455 I put high temp silicone and new exhaust O- rings on the expansion chamber of my Kx 112. Now I have more power and it is much easier to stay in the powerband. Night and day difference I can hardly believe it.

[@iMxrcyz]

Been thinking this was my problem, first and second bog and don’t idle at all , third and up runs decent thought I needed to re jet but I didn’t feel like that was really it I thought it was the exhaust.It as sploogon bad I sealed it we’ll see in a few days.Hopefully it fixes.

[@petethescalemodeller6130]

@@iMxrcyz did it fix the problem?

[@tylercotugno8387]

Did you figure it out, I just replaced the top end and when I put the pipe back on it wasn’t properly in the port. I couldn’t hit the power valve at all.

[@Zecor]

Maaan I thought there was something wrong with my 2 stroke since it was leaking that unburned premix I thought it was gear oil or something.

[@michaelharris9994]

Ssme shit here.. im gonna lean mine out a little.. its called sloodge, but freaked me out. I think we ok.. peace from Atl.

[@diversedad7954]

Better to have a little splooge than run it too lean. It's a good sign you've got plenty of oil in your mix lol.

[@Aglow37]

Michael Harris I wouldn’t switch ratios, I go 32:1 always and today I was doing lots of slow trails, lots of clutch work and low rpm, and had a bunch of oil on my swing arm no big deal just wasn’t rippin on her hard enough

[@donovonwood7858]

Do you guys sell a power valve rebuild kit for my 2000 yz125

[@rmatvmc]

We don't sell a specific "rebuild kit" but in our OEM parts finder you will be able to purchase all the parts needed to rebuild your power valve under the *Cylinder Head* assembly. www.rockymountainatvmc.com/oem-parts/Yamaha

[@lukaspenko334]

Tnx very much

[@3TapChapAS]

What brand of high temp silicone do you use?

[@Jacare1973]

Looks like Permatex Ultra Copper

[@Nickjacobs999]

Very helpful - Thx

[@joshturnquist8639]

Hey do you know where I can get a rubber boot for my 2004 cr125 2 stroke

[@331moto]

I'm assuming that if you have an exhaust leak at the flange on the cylinder, dirt, water and mud can get into the pipe and then into the cylinder?

[@rmatvmc]

possibly, yes. A small degree of performance could be lost too, but not likely unless it was very bad. The biggest issue is the mess it makes.

[@pas114]

I just bought a used 2002 cr125. It leaks black oil from the end of the silencer and where the silencer connects with the exhaust pipe. Any ideas on how to get rid of this/reduce it?

[@Aglow37]

I think your running to much oil on your gas, if I look In my silencer I can see oil to no big deal

[@masonolson4374]

What’s if it’s both sides

[@hhiiuubb]

Thanks

[@powderiders6054]

which brand and type of sealant do you use?

[@rmatvmc]

We used Permatex Red High-Temp RTV Silicone Gasket Maker on this bike. The first link in the description will take you to all the parts and tools used in this video.

[@powderiders6054]

@@rmatvmc Thanks For the excellent tutorial . I wish I followed your link prior to purchasing Permatex Ultra Copper Maximum Temperature RTV Silicone Gasket Maker…. Will It be ok to use as well ?….

[@mulliganrepairs2916]

Why does my expantion chamber come loose it of motor every time I put it back in?

[@hardendurobosnia17]

Vibrations Put some locktite on them

[@Jordan348_MX]

5:10 "...but they still leak". Thanks for the info! I have a new YZ250 with FMF system jetted to FMF spec and mine spits oil at that connection, I thought something was wrong with the bike. Of course I trail ride half the time, and the YZ250 is race bike, so they are built to fly, not lug, so I know thats part of the problem.

[@MAXlMUS]

Is this actually a silicone or a Copper grease?

[@rmatvmc]

I believe we used the Permatex Ultra Copper Maximum Temperature RTV Silicone in this video. You can check it out here: www.rockymountainatvmc.com/parts/permatex-ultra-copper-maximum-temperature-rtv-silicone-p

[@ryanhaulenbeck9368]

i had a question with my 2 stroke like i have a lot of that oil in my pipe and i just smoke and smoke not from running rich but from all that oil during out i think is there a way for me to get that stuff out?? plz let me know

[@mtbridingog9083]

Ryan Haulenbeck no not really it just has to be brother it builds up and evaporates from the pipe heat over time ....... But If theres a crazy lot of unburnt premix in the pipe check your head gasket and power valves and make sure everything is within spec for your bike......

[@Aglow37]

Start rippin it like you mean it and more of the oil will get burnt

[@nelscot]

Will exhaust leaks ever make a sound like piston knocking?

[@parkflyer2191]

Push your hand against the colder side of the pipe while the noise is present. If the sound stops then it probably can :)

[@nelscot]

@@parkflyer2191 ok thanks

[@Leavify]

What type of o ring should I buy for my ktm sx 125cc

[@RobertDamien8687]

What color silicone was used ?

[@rmatvmc]

Permatex Ultra Copper - www.rockymountainatvmc.com/parts/permatex-ultra-copper-maximum-temperature-rtv-silicone-p

[@michaelharris9994]

Thanx

[@builttowin6085]

Do the leaky pipe stop The bike from going into the band and smoking?

[@the_ltz_guymaster7912]

I have a 98 rm250 and the guy before me has a 99 exhaust system on and it’s leaking and it’s also running rich but the manual says 30:1 but I’m doing 32:1 klotz oil what do I do

[@erkielva1242]

Hey i see your using silicone, i have a yamaha dt 50 and im gonna do the same thing with my exhaust soon but i wanted to ask is it okay to use heat resistant glue instead of the silicone? A friend of mine who is an old motocross racer used somekinda heat glue on my bike when he helped me Change my exhaust wool

[@rmatvmc]

We've only ever used silicone. Heat resistant glue could work (we've never used it), however, to not have any doubts/concerns, we'd recommend using silicone.

[@erkielva1242]

Rocky Mountain ATV MC okay thank you for your answer

[@michaelharris9994]

Wanna race?

[@wildcrawls]

the oil on my bike leaks from the exhaust itself. do you think its the same problem?

[@rmatvmc]

No, if you have oil coming out of the end of your exhaust its not an exhaust leak. It could be a couple things, most likely your jetting is too rich or your exhaust packing needs replaced. Hope that helps!

[@wildcrawls]

@@rmatvmc thank you so much, highly appreciate your prompt reply. Have a great day!

[@hreindustries]

can you please do an updated tire change video while being mindful of not ruining the rim finish

[@rmatvmc]

Coming very, very soon!

[@Don_of_Dons]

Can you ride your dirt bike temporarily until you get it fixed? Or no? Bad idea?

[@rmatvmc]

It depends on how major your problem is but if you're ever in doubt, err on the side of caution to protect yourself and your bike. If it's just an exhaust leak like in this video, you won't cause any major problems by riding it but it should be a pretty quick fix so just taking care of it would be the best way to go. Hope that helps and thanks for watching!

[@Don_of_Dons]

Thanks Man

[@danglebarry5156]

What is the ruber thing called were the silencer meats the with the other pipe

[@_kieranwilliams]

That’s the thing I am currently looking for, for my YZ 125 1998 🥲

[@codyreid1857]

What I’f my pipe is moving where meets cylinder do I need a new one or just new pipe and o rings / spring old

[@BLINC606]

You don’t need a new pipe lol. Likely just new springs. You can buy new springs and the rubber piece together for like $15 on ebay

[@mikhailanatoliy9990]

Don't forget the pipe bearings!

[@crazydrummer181]

“What are those?”

[@rileyjohnson164]

Goteem

[@brax300]

When i pull my headerpipe off, and I’m cleaning it, and I take the O rings out, Will I need new o rings? If so what are they called? Just headpipe o rings?

[@Aglow37]

Yes

[@basslayer6933]

Where can I get a rubber boot my bike doesn’t have one

[@rmatvmc]

Check out our oem parts schematics found here: www.rockymountainatvmc.com/oem-parts

[@jxddson3621]

Someone please help I bought a brand new Yz85 straight off show room floor and oil is coming out the end of my pipe🤨

[@jasonpearson4983]

Needs smaller jets. It’s too rich and your probably not riding it hard enough. Remember it’s a race bike

[@RelentlessCo]

Rejet and stay on the pipe

[@samcg8662]

My dad Cr 500af is leaking prestone and we dont know were the leak come from so yea im trying to fegure out what is the problem

[@Super-Soakers2]

What exactly is this silicone can someone send me a link please

[@emmapringle0452]

Ive changes the o rings and the springs ?? Still leaking

[@Don_of_Dons]

Emma Pringle04 wow! Did you use some silicone

[@codyreid1857]

Mine moves do I need a new cylinder

[@letsgobrandontrump2024]

Does anyone have experience with a 91 kx250 is it a good year?

[@johnworley2708]

where do i get new pipe mounts?

[@rmatvmc]

You can pick those up under our OEM Parts Finder: www.rockymountainatvmc.com/oem-parts

[@johnworley2708]

Thanks so much guys, by the way I'm definitely come to you for my parts yall are quick thank again

[@rmatvmc]

*John Worley* That's great to hear. We have two warehouses. One in Utah and the second in KY. So if you live closer to one of our locations, the shipping time is cut down. Thanks, we appreciate your business with us!

[@Don_of_Dons]

I’m having the same problem with my kx125 but every time I start my bike it runs for 3 minutes then shuts off. Can anyone please help me figure out what’s wrong

[@ktm2smokers337]

Turn the gas on

[@RelentlessCo]

@@ktm2smokers337 lol

[@z400forlife]

You guys should do a video on how to fix the fmf "slip fit" header to muffler leak , paid over $800 for a exhaust that is designed to leak ? I don't think so

[@rmatvmc]

High temp silicone!

[@z400forlife]

Rocky Mountain ATV MC did that, is moves enough to blow the silicone out in 5 minutes

[@codyreid1857]

@@z400forlife that’s my prob mine is moving to much so I need a cylinder or new pip / rings

[@craingtmh7819]

I checked their website and they don have anything for my bike rm85 2002

[@austinmeredith5209]

Why isn’t there one for 2002 cr250

[@rmatvmc]

We have o rings, gaskets, and exhaust springs available in the OEM parts finder for your bike. You can check the OEM parts here: www.rockymountainatvmc.com/oem-parts/Honda

[@justinhallam2693]

justin more like sussy baka

[@michaelberry1476]

Im really early 2nd

[@DMTaske]

Dude, why you are not wearing safety glasses? If you're a professional mechanic that doesn't mean you don't need them :)

[@michaeljkasnter]

Always wear safety glasses- you need to follow your own advice. Do as i say not as i do

[@sanesaint8725]

Japanese make such a nice bike but they can't do a simple thing like make the muffler go in so it doesn't leak too funny