Cheap replacement Muffler

TrueFaith said:

I second jkv357's suggestion of a Delkevic. They seem to have the cheapest slip-ons. Cheap in price, but not quality. I've had one of their 14" carbon fiber slash-cut mufflers for several years now and I love it. It's not obnoxiously loud, is easy to install and it sounds even better and mellower with age. You can pick up a 14" stubby for only $200, or spend a little more for a longer muffler that would be even quieter. Here's their US website:
Delkevic

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Yeah, It's hard to turn down a great brand at a good price. I think that's where I'm going to look first. The carbon fiber ones look clean.

I'm driving a 250cc bike, I'm not sincerely interested in power. I am more concerned about blowing out a cylinder or other engine damage. I rarely consider altering what the engineers (some of the smartest on the planet) have produced, it's just that my motorcycle stand won't work with that bohemith of a muffler. Waxing the chain is a choir, having to roll it down the road a few feet several times between spray's.

I'm a firm believer in keeping the bike stock as much as possible. If I wanted 100hp, I would have bought a 100hp bike. Adding power almost always results in a shorter lifespan. It's cheaper just to buy the right bike to begin with. You are right though, the proper procedure for replacing a muffler with an aftermarket one is to get the ECU programmed and the bike Dyno tuned. A bike will still run, just not up to it's optimal potential.

The muffler prohibits the use of a swing-arm lift stand.

Without it I must neglect some maintenance and certain services. This bike does not come equipped with spools.

Tamir said:

Big Cahuna maybe you check out the next idea???
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You're right on both ideas. I will flip the clamp if I decide to keep the part installed, and the DB killer they gave me was a fraction too large to fit. I'll insert it when I can grind the lip down some.

-Cahuna

KeepTheFeather said:

Where did you order the exhaust from? I've been looking for the same thing for awhile, quite like the look of yours. Also any chance you could post a video of how it sounds in high and low rpms?

-KTF

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https://www.aliexpress.com/51mm

I'll post a video shortly...

KeepTheFeather said:

Oh did that need welding?

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No it's connected with 2 springs. You will need a "cross-pipe" though with 2 loops for attaching. Once you get the pipe, you can attach any 51mm slip-on that you like.

(Cross-Pipe Link)

You only need to dyno-tune a bike if you change the headers (pipes from the engine to the muffler). I used to think the same thing too.

Normally I'd keep the stock muffler but I had a scratch on it that was bothering me. And if the bike does topple over I can just buy another cheap muffler. I still have the old muffler that will be sold with the bike when the time comes.

Tamir said:

Oh, how could I have missed it, the original exhaust has a heat shield.
It's a very, very safety component.
A 💥🔥burns from a boiling exhaust can be fatal)🔥💥
(I edited it into my list above _ LINK)

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I like the idea of frame sliders but like you said, the type that stick out just dig into the ground and end up bending or breaking the frame, a much more catastrophic event than simply sliding along the ground safely wrapped in plastic fairing.

Fairings are replaceable, frames are not.

KeepTheFeather said:

@bigcahuna would it be possible for you to post that video of the exhaust sound?

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Sorry 'bout that, I totally forgot.

Tamir said:

Size 42 does not fit. If you order a part that says it fits our model, and it doesn't fit, then you can open a dispute, attach photos with measurements, and get your money back. And, these kinds of changes require the ability to make adjustments...etc
In the comments here (Big Cahuna), the guy from https://www.aliexpress.com bought it and then wrote that the size doesn't fit...making such a custom change D.I.Y requires knowledge, ability, patience, and it takes time.

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That review was mine and it turns out the pipe DID fit, but the clamp it came with was too big and didn't clamp it tight. I fixed the problem by putting a few mm gasket under the clamp and it worked. I could have just bought a smaller clamp but they were almost the price of the pipe and I felt I shouldn't have had to do that. It took almost a month to arrive so I really didn't want to be spending more months shipping parts back and waiting for more to arrive. That's the downside to AliExpress, most everything that doesn't fit into an envelope usually takes about a month to be delivered. It's great for buying things you WILL need in the future, but I use Amazon or Ebay for things I need within days.

KeepTheFeather said:

Also does anyone know what the diameter of the inner end of the middle exhaust link is in mm?

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Cold start video is uploaded. I'll post another video at higher RPM when I take it and get it warmed up.

View attachment 45908
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Yeah, I was going make a bracket by using a strip of steel and drill press holes on the ends. The zip-tie is just so I don't lose it on the highway in case the clamp doesn't hold. It's pretty rigid and I might not need a bracket at all. It's a small unit and very light. I'll flip the clamp next time I'm down there with a wrench. It bothers me too.

KeepTheFeather said:

Pardon my stubbornness, but why does it not fit? Isn't the mid pipe supposed to go over the gasket?

I saw that comment, I also found this one with a good review:

https://pt.aliexpress.com/item/1005001459527247.html?spm=a2g0o.productlist.0.0.74923dc9nEFMJt&algo_pvid=7335654c-8ebd-4b5d-b8e6-1ddbe82d4ab0&algo_exp_id=7335654c-8ebd-4b5d-b8e6-1ddbe82d4ab0-0&pdp_ext_f={"sku_id":"12000016207282252"}&[email protected][email protected]!12000016207282252!sea&curPageLogUid=tQrJEsnYheJH

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The pipe fit fine, the Clamp they sent me was too big so it didn't clamp down tight enough. In fact, it doesn't need a gasket. I just happened to have one that I wrapped around the pipe to make it thicker so the clamp would work. Yours may or may not arrive with the correct clamp. You can always buy another one if it's too big. I think they're around $10 or so if I remember.

KeepTheFeather said:

So correct me if I'm wrong but with an OD of 38mm + gasket with OD of 44mm, putting a "normal" cbr250r mid pipe with an ID of 40mm would mean it would crush the gasket 4mm.

The CBR300r mid pipe has 42 ID meaning it would crush 2mm instead of 4mm creating a "looser sealing" correct? Would this even be an issue?

Also @BigCahuna what did you use as sealant on the gasket? I saw some people use silicone sealant?

View attachment 45913
View attachment 45912

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I have no gasket.

The stock gasket came out with the stock muffler. The cross-pipe is metal on metal contact and clamped down on one side, and spring fit on the slip-on. as far as I can tell, I don't have an exhaust leak. I did look for a thin gasket because it seems to be the proper thing to do, but I couldn't find an appropriate size and it seems OK.

KeepTheFeather said:

Oh I see, perphaps a gasket from a smaller bike would do the trick, 50cc or 125cc gasket? As long as ID is 38. Ill look around.
So having a 40mm mid pipe on a 38 OD inner pipe doesn't cause a leak? Im surprised. Im guessing for a cbr300r its probably safer to actually find a gasket

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It wasn't so much the diameter of the gasket, it was how thin it was. Most of the gaskets were like 10mm thickness if I remember and I needed just a few mm.