Thumper Club Forum
Technical => Bike Problems/Questions => Topic started by: Frog on May 21, 2007, 05:58:58 PM
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Hi
Skorpion is great but definitely feels strangled by the Silencer. Is there any way of modifying the existing silencer to make it freer flowing + get a nicer noise?
Cheers
Frog
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Try this link ...........
http://www.renegade-products.com/
If you don't like their cans the link pipe excepts any 50mm end can.......
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Hey Frog,
If you don't want a noisy race can but do want to open it up try Quill;
http://www.quillexhausts.com/
Their cans are excellent and they know their thumpers. They really helped me out with the SZR, it pulls much better now and looks good, has more ground clearance etc.
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Hey Frog,
If you don't want a noisy race can but do want to open it up try Quill;
Renegrade are road legal .......... Race can with BS stamped baffle ......
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I uncorked my beautiful hand welded stainless steel Skorpion exhaust with a 3/4" steel grade stake, like the ones used on construction projects to hold concrete forms, string layout lines, etc. Also, they are tempered to be beaten on without cracking or shattering... good idea for this job.
I keep three of them in various diameters for just this purpose.... 1/2",5/8" and 3/4". I prefer the 42" stakes for more accurate aiming control and added kinetic energy, but it is probably like choosing a snooker stick... you know, tastes and preferences differ.
I always stake them from the inside (with the exhaust flow) when I can, depending on the curvature of the muffler and the location of the baffles. It traps less exhause gas and helps the natural flow at high RPMs, too.
Sharpen the stake on a grinder to make a very sharp and gentle taper, elongating it to go from a zero sharp point to full diameter in about two inches. Grease it liberally so it will rotate easily and not get stuck.... as you begin your first gentle strikes against the baffle plate, make sure you are hitting center, and continue to bump it back against the identical dent... very important. You now have a slide hammer that will eventually penetrate the plate... so be cool and gentle and slide/bump/rotate until you penetrate the baffle. Regrease, rotate,repeat. When you have pierced the hole to the diameter you desire, you have retained a beautiful stock system and probably gained some horsepower, not to mention maybe a better sound.
#1 caution is to be cool,deliberate, and patient. Use a channel lock or large pliers to rotate the stake, keep it greased so it doesn't stick, and be aware that you may be pleased with a smaller hole. You can always repeat the process to enlarge it but you will have problems closing it down. Remount and experiment if you want to find out what you have just done, acoustically.
Looking at the diameter of the hole you have just pierced is as easy as looking at the grease ring on the stake cone.
Keep the tip sharp so you don't pull away poorly welded baffles... you want to CUT the metal at first, not pull it away from the sides of the muffler, or cosmetic damage or an asymmetrical deformity may result.... ruin the beauty.
The #2 caution is to make sure you are aware of the depth and angle of your penetration, take measurements to make sure you are not about to generate a dent in your beautiful muffler from the inside.... again, be cool with this process.
It won't lose you any weight, but it will gain you some torque and probably horsepower, and it might now sound like a thumper oughta, and save some money. A substitute for this process is an elongated drill bit,but you should pop a tip guiding dent initially so the tip doesn't wander around before it penetrates the metal. Also. the drill bits will limit your diameter options, unlike the stake.
I looked all over for a Skorpion muffler that looked as beautiful as the original to my eye. My eye said nothing was out there, and especially hand welded in stainless steel, though an early carburated Suzuki SV 650 came close. I pulled out my collection of trusty old exhaust spikers. Worked like a charm, as always.
Old American Hot rodder trick to avoid tickets from cops who use flashlights to inspect for illegally installed too loud exhausts. "Yes Sir Mr. Officer, as you can see, those mufflers are dead stock factory units"
PS. Don't tell anyone else about this... I would hate for this deceptive outlaw mototrick to get out to anyone else but you. Intercontinental exhaust motolaw abuse regulations might kick into the equation, and we would all be exposed as dreadfully rebellious moto outlaw criminal types, an be inna heapa trubble.
Mumz da word... OK?
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Thanks Everyone
I will have a look at the stake option but if it looks iffy I'll go down the route of a new can
Cheers
Frog
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Hi Fellas
I think too much free time causes me to come up with solutions to problems that may not exist, but I'm not hurting anyone. In any case, I modified an acetylene torch by cutting off the head, removing the 90 Degree angle on it. Some rewelding and tapping and threading later, one good beer and a minimum of swearing....voila! (viola?)
It is now ergonomically incorrect, but it sure does speed up the process of uncorking stock mufflers while keeping them outwardly stock looking... my o my. Internal flame muffler surgery at its quickest. An old set of Norton/Dunstall mufflers I had laying around got this treatment (aftermarket generic units) and it really woke up an old 1977 XS 650 Yamaha Cafe Racer that needed a personality/attitude tuning adjustment. Sounds and runs like a proper vertical twin. He thinks he's British now. I'll have to go hunt up a Triumph or BSA or Norton to try to embarrass. Good clean motofun. (PS. Being a good neighbor/citizen type a guy, I don't crack it open in residential neighborhoods... as the 1938 Indian Owners Manual instructs...... "spinning the rear tire when coming away from stops decreases chain life, causes unnecessary drive train wear and creates ill feelings toward motorcyclists") The cultural damage done to us biker/motorcyclist types really took on steam when "The Wild One" hit the silver screen back in the late fifties.
My favorite line from the famous movie? Johnny (Marlon Brando in his prime) is hanging around the town cafe sniffing around the comely local waitress, who is justifiably intrigued by his cool triumph 650 and his distinctively nonlocal "attitude" and nonstandard dress code.
She asks him.... "What are you rebelling against, Johnny?" He responds cooly..... "Whatta ya got?"
Wisdom and humor for the ages. Happy Motoring, but just don't hurt anybody... yourself included.
As you guys say... Cheers.