Yosh 4-1 on a '83 GS1100e

[fast eddie 52]

My son fixed up a dented Yoshimura 4-1 that I had picked up cheap, but the slip on muffler is considerably shorter than the Yosh on his '82 GS1100e, probably a foot shorter. His muffler extends just rear of the rear axle, mine is like I said about a foot shorter...any exhaust experts available to give me input on what to expect with a "shorty" pipe? Or should I cut/weld my muffler section to match my sons? Performance is more important to me than looks, but I'd just as soon not have to cut weld if it won't really make much performance difference. I think header length is the more important performance parameter, but is overall length also important???

[limeex2]

I've been looking for a Yosh replacement can for over a year. Tough to find. A free flowing slip on type muffler should all be close to the same as far as performance. Cone Engineering has a good selection of slip ons and I saw a very nice Yosh styled version on Webike/Japan. With the exchange rate, the Webike version wasn't priced to bad, closest I've seen to a Yosh but still not cheap.

[fast eddie 52]

my question is about the overall system length, I have an original Yosh can that my son polished up for me, but it's mounted on a rear pipe section(part that slips on header) that is shorter than my son's Yosh system. Did Yoshimura make different length systems(i.e., a "shorty") or has this one been modified, and what would be the best setup? I rather like the look of the shorty, it ends just rear of pass pegs, while my son's ends just rear of rear axle. Which is right, and what might be the performance difference?

[dorkburger]

I’d imagine that performance difference would be minimal, if even noticeable. Probably a noise difference though.
i have the "long" one that ends at the axle. I have pictures of it opened up if you need.

[fast eddie 52]

shorty yosh

here's the shorty...009.jpg...still have to rivet on the yoshimura emblem like on the other bike I'm posting which do you like better and/or which is "correct"?

[fast eddie 52]

longy yosh

010.jpg...here's the other Yoshimura on my son's GS1100e...which is best??? Is it sacrilege to go with the shorty??? He wants me to restore the shorty to original...but did Yosh make a shorty???

[dorkburger]

Looks like a section was taken out of the mid pipe, then it was welded back together. I thought you referring to the canister itself being shortened.

[Steve]

Yeah, it appears that the only difference is the mid-pipe. Shouldn't make any difference in performance.
Couldn't tell you which one is more "correct" than the other.

I hope something like that doesn't affect performance. We added a mid-pipe to my son's bike recently. We are also in the process of changing engine gaskets, so haven't had a chance to run the bike to see if there was any change.

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