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Post by tp555 on Sept 25, 2007 18:11:51 GMT -5
If the muffler you are referring to is the first pic, then you need a small chrome tip on the outlet and a fancy clamp holding it in place.Paint it black.Chrome is expensive.
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Post by earlwb on Sept 25, 2007 21:34:18 GMT -5
You know, they have some chrome like thin sheet metal you could carefully wrap around the canister, and a chrome tip would work too. Then it would look pretty good. The muffler doesn't usually get over 300 degrees farenheit, you could lay on a layer of carbon fiber cloth and heat resistant resin. It would look pretty tricked out then. What diameter exhaust pipe does the muffler slip onto?
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Post by 90GTVert on Sept 26, 2007 15:14:11 GMT -5
For you guys that are just looking for any muffler you can make fit and sound good, check out your local motorsports dealer. A friend was able to pick up a used (but just like new) FMF muffler for $50 and we made it work. That was a nice muffler with a deep mellow sound.
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Post by tp555 on Sept 26, 2007 15:58:39 GMT -5
Well $50 is too high for me.I'd rather make my own. I do have the resources for this.Its called plan B.
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Post by 90GTVert on Sept 27, 2007 17:48:48 GMT -5
Just throwing more suggestions out there for you or anyone that happens to be browsing this thread. I didn't think $50 was bad for a polished aluminum high quality muffler, but everyone has a different idea of cheap and likes different things.
It cost me around $40 to build a chambered muffler for a 150cc from scratch. Best sounding muffler I have heard on a stock 4 stroke scoot. The FMF was next best in sound, for $10 more without hours to build it.
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Post by tp555 on Sept 27, 2007 19:15:21 GMT -5
What is a fmf? What I'd like to get is a muffler from a 250cc twin.A virago or ninja.Whether they are separate or one piece with the front pipe I don't know.Surely not cheap either. My plan B will be all aluminum for less weight and have a removable baffle for experimentation.This is the fun part. I make prototypes for companies and parts.So now I am doing something for me. I ordered the material $26 plus they get $9 for shipping and tax.Just waiting for it to arrive.
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Post by 90GTVert on Sept 27, 2007 20:09:20 GMT -5
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Post by tp555 on Sept 28, 2007 6:25:54 GMT -5
Nice. I'd go $50 If I could find one of them used. Probably won't happen.
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Post by earlwb on Sept 28, 2007 8:34:06 GMT -5
I like the "Q" muffler, but they don't state anywhere that I can see what the inlet tube size is. Then I got sticker shock. Really nice mufflers though.
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Post by 90GTVert on Sept 28, 2007 8:38:35 GMT -5
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Post by earlwb on Sept 28, 2007 12:18:57 GMT -5
yeah but that is a 2 cycle engine muffler.
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Post by 90GTVert on Sept 29, 2007 0:15:16 GMT -5
guess that one was, but from my original point, check around for used ones and check out ebay. fmf is not the only brand that makes cool mufflers for 4 strokes either.
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Post by earlwb on Sept 29, 2007 8:12:42 GMT -5
true, I am sort of stuck on Harley mufflers at the moment. Mainly because Harley riders are always trying out different mufflers and pipes, thus they have lots of older used pipes and mufflers laying about that one can get cheap. For our purposes even the OEM stock muffler should work very well. As the little engine isn't big enough to feel too much back pressure from the mufflers.
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Post by earlwb on Oct 2, 2007 20:07:30 GMT -5
I just got my four 1/4" thick, 4" square metal plates with the 1 and 3/4" hole in the middle in today. i27.photobucket.com/albums/c163/earlwb/scooter/MufflerAdapterFlange.jpgI was using a magic marker to see how the exhaust pipe flange will fit. So there is no problem lining up a flange and drilling and tapping the three holes. Anyway the tube fits OK being a little snug, but a coupe of raps from my big brass antique hammer will take care of that no problem. i27.photobucket.com/albums/c163/earlwb/75fabc42.jpgEarlier I happened to see that "Auto-Zone" auto parts stores here in my area also have lots of exhaust pipe adapter tubing for fising up cars. They happen to have a 1 and 3/4" short tube that would work well too for $1.49 each. it is regular steel exhaust pipe tubing and is more thin than the 1/4" thick, 1 and 3/4" tube I happen to have at home. The exhaust tubing weighs less than the 1/4" thick tubing that I have. So this weekend I get to practice my stick welding skills. So since I only need one of these plates. I can work out a deal if someone wants to get one. The 1 and 3/4" tubing is easy to get at Auto-zone and one can have it welded or brazed onto the metal plate. It is a lot easier to mail it out flat too. The idea is to weld on a short 3 to 4 inch long piece of tubing to the plate and then use a slip on muffler that you clamp onto the adapter. The stock exhaust pipe on a Gy6 engine is angled upwards at a angle, so this keeps the angle the same. Now how you attach the muffler to the scooter is your own problem to work out.
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Post by tp555 on Oct 3, 2007 6:28:04 GMT -5
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Post by earlwb on Oct 3, 2007 9:21:32 GMT -5
That is a really nice adapter you made there. Did you gold anodize it too? That left a huge pile of aluminum shavings on the floor.
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Post by tp555 on Oct 3, 2007 19:09:18 GMT -5
The color is from my light source, regular 60 watt bulb up close.My camera has some age on it.So It gets funky sometimes. I got all kinds of chips on the floor.The copper ones get picked up for sortiing. regards.
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Post by tieso on Oct 12, 2007 2:58:21 GMT -5
That's some nice machine work tp555.
I looked on ebay and in the local paper, and found a lot of stock exhausts in nice condition off gsxr's and other sport bikes for around $25 that still had the headers on them. They resembled the MRP designs.
A while back I also bought a muffler off JCwhitney, it was the "shorty." I made a expander and bracket and welded everything together only to realize it was way too loud even for my young ears. I'd say around 110db just guessing. I was going to put a big tip with a resonator element on it, but said screw it.
I don't know what is too much back pressure. I'd assume a muffler for a 1000cc twin engine would have more than one needed.
Also you can buy the exhaust packing from motorcycle shops if I remember right. My friends use to get it for tuning dirt bikes.
PS: My Roketa had a single bead weld on it's 1 bold exhaust bracket, from the look of it the factory didn't even clean the joint before tacking it. I'm assuming they used robotics, and didn't have a budget for flux so they tacked on dirty joints instead of doing proper welding. It didn't even fracture, it separated as if it was super glued.
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Post by tp555 on Oct 12, 2007 7:03:59 GMT -5
See my other thread,mid$ exhaust, for the plan b pics.It is still a work in progress.
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clint
Junior Dawg
Posts: 8
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Post by clint on Oct 12, 2007 21:24:58 GMT -5
I just wanna thank lancer150 for the tractor muffler info. I used the link and ordered one for my sunl that I hope to bring back from the grave. I picked up the stock strap on muffler and thought it must be full of water or concrete. Why the hell are they that heavy? The idea in vehicle design is to minimize unsprung weight, not maximize! You may think the tractor muffler looks ugly, but knowing it only weighs three pounds or so is pure beauty to me. Now I'll just have to figure out how to mount the thing once it gets here.. pipe hanger strap? New MUFFLER TYPE: Stanley / Tractor muffler Where to buy: Rural King Price:$12.59 ruralking.com/rko/cart.cgi?PRODUCT=004771063&SPD=xNA77489796cT26&AISLE=4282 I recently found this exhaust and it made my scoot even quieter than the stock set-up. It has a good baffle and i must say for the price it's the greatest deal you will find . the downfall is that it's not very pretty it is gray but can be painted with high temprature paint . It is also very light it weighs about 3 lbs id say. ;D If you are looking for quiet and sinple muffler look no further here it is ..
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Post by tp555 on Oct 13, 2007 6:18:44 GMT -5
The stock muffler weighs 7lb 14oz.At least mine does.Way too heavy and the reason it breaks clamps.Eventually i'll open up mine for some discovery to find why.
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Post by earlwb on Oct 13, 2007 8:01:50 GMT -5
Actually the clamps are breaking because of the narrow sharp edged standoffs the clamps bolt into on the mounting bracket. Plus the fact that they support the lower half of the muffler and not the upper half. So it gets a vibration resonance mode going. The sharp edge of the standoffs causes a stress riser to form resulting in the clamp breaking off with a crack along the edge formed by the standoff and the clamp. It happens fast too. I experimented with this and found that if you put in a good thick washer between the standoff and the clamp, you shouldn't have problems with the clamps breaking off anymore. In my case I fabricated a short pice of angle iron and mounted two extra clamps (just in case spares, might as well make them work too). I then tried mounting the clamps up against the standoffs or using the angle iron as a spacer/washer, and sure enough the muffler clamps would break off if they were up against the standoffs, but not if you used the angle iron as a washer or spacer between the clamps and the standoffs. Here is a pic of when I was experimenting with how to stop the muffler clamps from breaking. I don't think that one needs to use a length of angle iron, but it helps a lot, but a pair of good thick steel washers would work just as good and you probably don't need the extra muffler clamps either.
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Post by lancer150 on Nov 22, 2007 14:55:16 GMT -5
Wow cool clint how's how ya likin that tractor muffler? it's not too bad huh... I've noticed after a few miles that it get's slightly louder.but it's still muffles the sound pretty good....and it's very light. The stock muffler that came with my Lancer GSR weighed alot too it probly weighed 15 to 20 lbs. they said it is aluminum on the website...but i know they aren't .. anyway HAPPY THANKSGIVING...
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Post by lancer150 on Jul 24, 2008 13:59:54 GMT -5
ok guys I got a harly muffler given to me a few months ago .I'll get a pic this weekend ..it sounds bad 2 the bone
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Post by pukame2 on Jul 24, 2008 21:24:25 GMT -5
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Post by pukame2 on Jul 25, 2008 14:23:32 GMT -5
Wow! JC Whitney sure makes exhaust mufflers affordable. Since price is my credo, I'll go for their stuff. Just something to consider. Discovered you may need this to insert into straight pipe to quiet it down. mini mufflerLive long, and prosper........riding.
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Post by pukame2 on Aug 20, 2008 0:43:29 GMT -5
This is one of the better postings that I've come across that deserves a sticky. ;D ;D ;D At the risk of sounding critical, but the prices I've seen for high performance mufflers, I think that the newbies can benefit from this post.
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Post by Aerostudent on Aug 27, 2008 0:49:00 GMT -5
Now I just need a source for a 1" header pipe, that is the main component restricting out exhausts. Sure, the stock mufflers are not very high flow, and opening them up can help some, but the muffler can only do so much before it hits a roadblock, the header pipe.
Anyone have sources for 1" header pipes for a gy6 150, feel free to post them. I am thinking of getting one custom made, but that may be pricey, though I do know a guy with not 1, but 3 machine shops, so maybe we can work on something. ;D I agree that this is good info and should probably be stickied in the "mechanics corner" in both the exhaust and upgrade sections.
Aero
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Post by Troll on Aug 28, 2008 14:21:38 GMT -5
Quick question is the restricter in the muffler different from the baffles or are they the same thing. Someone told me that if I derestrict my muffler it'll burn the valves up? Is that true??
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Post by Aerostudent on Aug 28, 2008 18:50:57 GMT -5
Quick question is the restricter in the muffler different from the baffles or are they the same thing. Sometimes there is a washer welded in the muffler that will restrict the airflow in the muffler, though it is most common in 50cc scooters and 2 strokes. The baffles are one of the main sources of restriction in our scooter mufflers, them and the header pipe being a bit too small. Someone told me that if I derestrict my muffler it'll burn the valves up? Is that true?? Not that I've ever heard of. If you run with NO muffler or exhaust pipe at all, then yes, you will warp your valves from the cold air being so close and the valves cooling too fast. But simply running without the baffles should not dammage your valves in any way. But be warned, it will be loud without any baffles. ;D Aero
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