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28th October 2018
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XL FORUM TEAM MEMBER
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Join Date: Mar 2011
Posts: 2,359 Sportster/Buell Model: xlh convert to xlch Sportster/Buell Year: 1978 Sportster/Buell Model #2: xlch Sportster/Buell Year #2: 1972 Other Motorcycle Model: Sportster 48 Other Motorcycle Year: 2010
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77-78 OEM exhaust baffle removal
So I wanna gut the insides of my OEM 77-78 cannon sized muffler. It's too restrictive and sounds ridiculous.
Not sure how to go about this, never done it and don't wanna mess up the outside of it in the process.
Here are some photos of it and what is the best way to go about this.
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If your gonna do something, do it right!
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28th October 2018
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Custom Bike Builder
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Join Date: May 2010
Posts: 2,450 Sportster/Buell Model: XLS Sportster/Buell Year: 79 Sportster/Buell Model #2: XLS Sportster/Buell Year #2: 82
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Rather than destroying this nice oem muffler,why not use a set of drag pipes
till Shes broken in? (Your new engine build)
Id say fill up the beer mug and relax.
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28th October 2018
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Blind Owl
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Join Date: Jun 2009
Location: Sunshine Coast
Posts: 6,465 Sportster/Buell Model: XLB, XLCH, Sporton Sportster/Buell Year: 1962 Sportster/Buell Model #2: XLCH Sportster/Buell Year #2: 1966 Other Motorcycle Model: XLCH (Another one) Other Motorcycle Year: 1966
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It's not just that it's restrictive and sounds like krap - it's heavy and ugly.
Go to your nearest exhaust place. ask them to make a two into one collector for you. Get them to neck it down to 2 inches for you. You can now select a muffler that looks good and works better. I ran the spiral core Hot Dogs for years.But there are plenty of nice chrome aftermarket mufflers that you can pick from.
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"I know only too well the evil that I propose. But my inclinations get the better of me."
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28th October 2018
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Senior Master Custom Bike Builder
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Join Date: May 2010
Location: Pottstown PA.
Posts: 14,502 Sportster/Buell Model: xlch Sportster/Buell Year: 1960
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see if you can find a hole saw to fit inside there.
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72 1000cc barrels and heads, s&s 41/2'' flywheels, sifton cams, s&s super B w/ zippers thunderjet w/yost powertube, andrews gears,and shafts, competition engineering kevlar wet or dry clutch, 72 oil pump, morris magneto w/auto advance and single fire module, cycle electric generator w/electronic regulator,73 cu.in.
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28th October 2018
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XL FORUM TEAM MEMBER
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Join Date: Jun 2011
Location: On a farm
Posts: 6,513 Sportster/Buell Model: XL77.2R Sportster/Buell Year: 2006
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I modified this 2 into one. You have to cut the welds at the front. Then you can slide the whole baffle out. You still have to cut the three spot weld at the end. To keep simple, be ready to paint the whole reassembly black or send to be rechrome; I just paint the new front welds and pipes with aluminum paint and cover the modification with the heat cover. At the back, couple of screw to hold it. You will see, the holes in the baffle are on the small side.
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29th October 2018
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XL FORUM TEAM MEMBER
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Join Date: Mar 2011
Posts: 2,359 Sportster/Buell Model: xlh convert to xlch Sportster/Buell Year: 1978 Sportster/Buell Model #2: xlch Sportster/Buell Year #2: 1972 Other Motorcycle Model: Sportster 48 Other Motorcycle Year: 2010
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Quote:
Originally Posted by 60weight
Rather than destroying this nice oem muffler,why not use a set of drag pipes
till Shes broken in? (Your new engine build)
Id say fill up the beer mug and relax.
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I really don't like the looks of common drag pipes. I like the look of this OEM exhaust better. Now XLR drags, that would be a different story, nice perfect curves and the look you can't beat. But they are hard to find and expensive when you do.
While I agree about not messing with obsolete OEM parts unnecessarily, these mufflers are cheap and many available on eBay.
I'll get another one and put it on the shelf so I got it.
Engine is broke in. I had 1000 miles on it before I tore it apart 4 years ago. 400 miles on it today. |
29th October 2018
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Biker
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Join Date: Oct 2014
Location: Uppsala, Sweden
Posts: 52 Sportster/Buell Model: XLH Sportster/Buell Year: 1971 Sportster/Buell Model #2: XLH Sportster/Buell Year #2: 1978 Other Motorcycle Model: XLCH Other Motorcycle Year: 1971
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Here you can see where I cut my pipe. I have removed the original silencer and replaced it with an 2,5" perforeted tub 12" long without packing, The bike run great and the sound is really nice. |
1st November 2018
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Senior Custom Bike Builder
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Join Date: Jan 2011
Location: Paradise
Posts: 2,838 Sportster/Buell Model: xlch Sportster/Buell Year: 1977 Other Motorcycle Model: BMW K-1200/GT Other Motorcycle Year: 2004
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Quote:
Originally Posted by 60weight
Rather than destroying this nice oem muffler,why not use a set of drag pipes
till Shes broken in? (Your new engine build)
Id say fill up the beer mug and relax.
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Dead on the correct answer.....
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If loud pipes save lives....imagine what learning to ride will do for you.
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1st November 2018
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Chief Master Mechanic
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Join Date: Oct 2018
Posts: 484 Sportster/Buell Model: XL racebike in progress Sportster/Buell Year: 1981 Sportster/Buell Model #2: Sportster with sidecar Sportster/Buell Year #2: 2001 Other Motorcycle Model: Moto Guzzi V11 Lemans Other Motorcycle Year: 2002
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1st November 2018
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Senior Master Custom Bike Builder
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Join Date: Jun 2008
Location: Cornelius, OR
Posts: 9,621
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Straight pipes are not the answer for the street. No matter how bitchen they sound or how nostalgic or "correct" they appear.
Straight pipes suck!
Ideally a 2:1 pipe should terminate in a Venturi that leads to a megaphone. The Venturi enhances the scavenging effect and the megaphone allows the gasses to gradually slow down without getting in the way of the next pulse and also works as a check valve restricting reversion. A pressure wave will not travel backwards in a megaphone because it gets squished down.
They don't call me Ironhead Rick just because I'm hard headed
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Ryder Rick "I know right from wrong, but sometimes, wrong feels right"
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