Quiter Mufflers - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 11 (permalink) Old 03-13-2012, 07:39 AM Thread Starter
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Quiter Mufflers

My 1986 VN 750 has fat bot mufflers but is too loud for registration. Is there a quick mod ai can do, or shoudl I buy some quiter mufflers for getting road certification ? Ist quite strick in Australia.

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post #2 of 11 (permalink) Old 03-13-2012, 08:44 AM
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You "might" be able to tone it down enough with the right aftermarket baffles. I don't have any experience with them as what to suggest in regards to length, hole size ect. But it's an option.

The other option is a new exhaust & that can get quite pricy. Good Luck!
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post #3 of 11 (permalink) Old 03-13-2012, 11:52 AM
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Maybe you can find somebody parting out their 750 and you can grab their stock exhaust for certification?

1986 Kawasaki Vulcan 750
NGK Iridium Plugs #7803/DPR7EIX-9
Duralast Gold ETX15 AGM Battery
Coastered & Shaved
TOC MCCTs
Metzeler ME880 [110/90-19, 170/80-15]
Balance Dampers Replaced
Tuxedo Mod
Rebuilt Forks w/ Progressive Springs
V&H Cruzers
VN750.com Grill Cover
Meanstreak Seat
Emgo 23-92411 Handlebars
MOSFET FH012AA R/R


1990 Kawasaki Vulcan 750

1998 Honda VFR800 FI

2014 Honda VFR800F

1989 Pontiac Firebird Formula 350
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post #4 of 11 (permalink) Old 03-13-2012, 12:11 PM
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And you can go to a muffler shop and just see they can fix you up with something. A small car muffler might look stupid, but be quiet, and work if you're just going to yank it off right after the inspection.

Not completely sure, but are you saying you have an exhaust off a Harley Fat Boy? Did you try going to a Harley shop and asking if they have a quieter muffler?

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post #5 of 11 (permalink) Old 03-13-2012, 05:03 PM Thread Starter
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yep harley do, but the price is high. $349 aussie dollars. i am looking at wreckers today.

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post #6 of 11 (permalink) Old 03-13-2012, 05:18 PM
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These folk help w/V&H pipes....check 'em out
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post #7 of 11 (permalink) Old 03-13-2012, 11:49 PM
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The guy that I got my '00 750 from a guy that gutted the mufflers and it was very loud. One of the first things I did was get some straight pipe baffles and put them in. Reduced the noise level some, but was still a bit loud and I like quiet. Last week I found a pair of 883 Sportster mufflers on Ebay for $45 that were just about new. The guy said that he rode it home and changed the pipes. I believe him too, no smut on the inside at all. So they came today and I mounted them. Had to get just a few nuts and bolts and some 1/8" x 1" flat steel stock to make a bracket and two muffler clamps. Took her on a short ride and now I got to figure out how to get ride of that annoying rattle that the speedo is making. Couldn't hear it with the old mufflers on. So if you can find a cheap pair of Sportster, give them a try. You can always take the things off until your next inspection if you want.
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post #8 of 11 (permalink) Old 03-14-2012, 09:46 AM Thread Starter
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Good ti[p. I see the wreckers tommorrow. He has a pair of original fat boys which may do the trick, its uoder 92 dcbls in oz to pass.

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post #9 of 11 (permalink) Old 03-14-2012, 11:40 AM
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Quote:
Originally Posted by CW-4 View Post
The guy that I got my '00 750 from a guy that gutted the mufflers and it was very loud. One of the first things I did was get some straight pipe baffles and put them in. Reduced the noise level some, but was still a bit loud and I like quiet. Last week I found a pair of 883 Sportster mufflers on Ebay for $45 that were just about new. The guy said that he rode it home and changed the pipes. I believe him too, no smut on the inside at all. So they came today and I mounted them. Had to get just a few nuts and bolts and some 1/8" x 1" flat steel stock to make a bracket and two muffler clamps. Took her on a short ride and now I got to figure out how to get ride of that annoying rattle that the speedo is making. Couldn't hear it with the old mufflers on. So if you can find a cheap pair of Sportster, give them a try. You can always take the things off until your next inspection if you want.
not sure if you are referring to the shaky tach symptom or something else, but here is how I fixed mine:

On the back of the tach and speedo, there is a mounting post with a shoulder. A rubber spacer rests against the bracket and gets compressed against the housing by a washer and nut. The problem is that the shoulder on the post is not low enough for decent compression of the rubber spacer. I resolved this by adding a metal washer with an ID large enough to clear the shoulder and compress the rubber spacer tighter against the back of the tach/speedo housing. This make the rubber spacer fit a bit more snug, but still has some dampening to it. I reassembled the dash and mounted it.

This seems to be a real good permanent fix for the shaky tach and speedo. The original configuration left it so loose that you could actually wiggle it on the mount.
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post #10 of 11 (permalink) Old 03-14-2012, 08:54 PM
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Yup....I put Sportster mufflers on mine (used, but with stock baffles) and its 200% quieter than my stocks were. Beware though, they have more restriction than stock, and will eventually cause your engine to run richer. After your inspection, you may want to do an earshave and switch to pod aircleaners for better air intake.
Im willing to bet that the baffles on your FatBoy muffs had been removed, because the stock ones are quiet.



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