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3/21/2007
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HAIKU, HI
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Edited Date/Time
6/10/2016 2:02pm
On the way to the glen Helen national I passed a couple of motorcycles that had modified stock exhaust for these applications. My immediate thought was why? Reason is do you want to spend over $200 plus an hour of your time and still have an exhaust without fresh packing?
The first thing that happens when you use an exhaust system with these mods is increased heat due to the smaller exhaust tip. That puts an immediate stress on the packing so it only makes sense to start with fresh packing. If you don't due to the increased heat the packing will now go away more quickly and you'll have a loud bike.........with a quiet tip.
Moral of the story: Unless you plan on repacking your stock exhaust while installing a spark arrestor and or quiet tip I would DEFINITELY go with the slip on.
The only exception is the casual rider that just putts around their property but even then the worn packing factor works against the goal of less noise in this application.
However, I just purchased a slip on FMF, and I think its the way to go.
1) were you ever sound tested?
2) did you ever repack?
3) what prompted switch to go with a slip on this time?
The Shop
Also, is this the same concept (the one you posted) that white brothers used a while back on some of their off road exhausts (10 years or so ago)
http://motocrossactionmag.com/bike-tests/we-ride-the-rocks-racing-steal…
The dream project bike
http://motocrossactionmag.com/bike-tests/we-ride-rocks-racings-yamaha-y…
The Stealth Pro I raced once and went 4-4 for 2nd overall in the 50 Novice class at REM on an extremely rutted and slippery course. Didn't make the test (slipper clutches don't do well on the dyno) but I raced with the Hinson slipper clutch and LOVED it.
Forget Rekluse clutch less auto deal. IMHO Hinson's slipper clutch is a secret weapon for braking bumps and pretty much is a handling plus all the way around.
http://www.youtube.com/watch?v=sH4Zeug280M&sns=em
Adding and removing discs
https://m.youtube.com/watch?v=LXPWWV2_Okc&itct=CBoQpDAYASITCNr1yLi4oM0C…
This is a Super Trapp exhaust of a guy I recently met 75 year old father. The packing is history so I'm hooking him up with fresh packing
Have you taken it any further than the Stealth Pro 250? Or anything in the pipeline?
That looks like the Super Trapp system that had mechanical noise suppression baffling - the somewhat large 'button' I can see looks like the welded on button on an end cap I put on one of my TT2 Ducati Reverse Cone Megaphone systems. As a pure Megaphone, it could wake the Dead - with the Super Trapp disc end cap, I could make it civil, then add discs right to the point it became the Megaphone again, for track days.
But, I could be wrong, they may have used large buttons to hold the disc base plate on, with the perf. core, absorption systems.
I had a Pro Circuit T4 aluminum/stainless slip on. That pipe came with a spark-arrestor insert. Basically it was a thin-walled piece of stainless tubing with a wire-mesh screen on the end.
With the PC Muffler and their insert, the bike was downright quiet.
How to repack Super Trapp
I knew they were a long time Bristol Core customer but didn't know what products they were using IE steel wool and or packing
Regarding future projects I would like to build street legal two stroke dual sport with quiet exhaust and ride it to the track. Swap wheels then moto on then put dual sport wheels back and and ride home.
I'm reality challenged as I don't have a garage, the bike or the sponsors.....yet
A useful system are / were the Super Trapp discs - I think Can Am Enduro bikes, for a couple of year models, had them. Bit prone to clogging up on 2ts..I remember a mate of mine, that had no concept of maintenance, had his completely clog up, with nearly all of the discs baked together. Dumber than a post, he was, and still is.
What was that flip lever / butterfly plate set up you could get in the 60s / 70s - the 'Snuff or Not' ? I still crack up when I stumble upon old ads for them . It's funny how their concept 'sort' of came into mainstream use, with a few of the exhaust valves in 4t road bikes (far more sophisticated / involved, of course)., decades later.
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