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The Exhaust Page |
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Holeshot
Exhaust Exhaust Rattles This section will chronicle the efforts in characterizing and improving the exhaust systems on the V-4 family. In general, none of the major manufacturers currently manufactures exhaust systems for any of the V-4's. Most manufacturers make some sort of slip-ons. These are illustrated in catalogs such as Dennis Kirk. Many listmembers currently have aftermarket slip-ons. In the future, this section will catalog those exhausts, and have a review of each.
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 The photo above shows the approximate outside position of the inner crack.
The top right photo shows a typical crack. The photo to the right shows a pipe that
has been welded. It is hard to believe that a small crack like this can make such
noise. But it does!! |
Many Magna owners complain about exhaust 'rattles'.
Many things can cause these rattles. In many cases, its as easy as tightening the
muffler clamps. Other times, its not so easy. The exhaust assembly on the
Magna is a dual wall assembly. On most of my Magnas so far, I have experienced what
I call 'inner wall cracking.'
What happens is that the exhaust usually cracks on the inner wall, by the
front, where it connects to the engine. Inside the collector, in the front
exhaust, about 1"- 2" down inside, there are little stress relief holes. The
pipes have a tendency to crack around these holes. After removing the
assembly, look inside the front two exhaust pipes. If you look carefully, you should see
the hole & the crack. This is where they break. I've had two welded so far, the 1984
& the 1986. The 1984 was not making noise, but I had it welded anyway. It lasted well
over 20,000 miles (until I dumped the bike). The 1986 I had welded in 1998, and so far, so
good. If your pipe is cracked somewhere where you can't see it, then I see no way around
either living with the noise or replacing the pipe. I was lucky enough to have a spare
exhaust hanging around (However beat up it was) that I put on the 1986 to verify that the
noise was indeed coming from the exhaust.
A good welder will have a welding tip small enough to fit in the exhaust.
I had mine done at Reynolds Welding, Derry, NH, (603) 432-7327
(Old Material from the V65 Society Newsletter)
Ernest Kenny has fitted a Mac 4 into 1 aftermarket performance exhaust onto his `84
V65 Sabre... cost was $120. Ernest observed an 8 mpg drop in mileage once the
aftermarket exhaust was installed.
Gaylon G. tried a Jardine aftermarket exhaust set-up on his `86 V65 Magna, but felt that the system was too loud, didn't look good, and did not noticeably improve performance. He then switched back to the stock exhaust.
Jeff D. has added Cobra F-1 slip-ons to his `85 V65 Magna, and reports that they are a good fit, and give a "throaty exhaust note past 1/4 throttle". Malcolm Davies has also added Cobra F1 slip-on mufflers to his `85 V65 Sabre... $152 from Dennis Kirk.
As with most motorcycles, the stock exhaust system has been specifically designed and "tuned" to the engine. It is unlikely that an aftermarket system will ever work as well as the stock system, unless such system has been blueprinted specifically for that engine using a dyno. While reduced backpressure may increase top end horsepower, it will also often impair low/mid range performance and economy, especially on motorcycles.
Coming Soon!?
Coming Soon.