Yet another exhaust question. - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Engine / Exhaust / Cooling
\ From the radiator, through the case and out
the exhaust. If it has to do with the cooling,
engine or exhaust, discuss it here!

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 12 (permalink) Old 11-15-2006, 01:25 PM Thread Starter
Junior Member
 
Join Date: Oct 2006
Posts: 12
iTrader: (0)
 
Yet another exhaust question.

I know there's no lack of exhaust questions that have been asked and
answered 50 times already, which is why I scoured the archives before
I wrote this, but I can't seem to find quite what I was hoping. So
if you'll bear with me, I need to add one more to the list for future
generations.

When I drilled the outlet of my stock exhaust with the goats belly
installed, the tone of the sound was awesome. No complaints at all
there. Cruising down the residential streets in my neighborhood at
low speeds garners a lot of onlookers. I'd rather not remove the
goats belly altogether, I'll relocate the r/r, but I would like to
get it just a little louder to be perfect for me. That brings me to
my two questions. I read that if I remove the mufflers and look
inside from the back, I will notice a "screen" of some sort, and some
people have drilled or removed it altogether. I don't have the
opportunity to do that right now, and I was wondering if anyone can
give me a better description of this "screen"? Is it a fine mesh
like a screen door, or a large crosshatch pattern? I would think
that if the holes were much larger than a window screen, I probably
shouldn't waste my time. But more interesting to me is the rear of
the pipes where I drilled the holes. I've only gone through the
first layer of metal; underneath is a baffle of sorts where the
exhaust gases can escape around its outer edges which is pretty
tight. Has anyone drilled through this second layer as well? I
would think it should give a noticeable increase in sound… I would
think! But I'd hate to drill through it only to find it changes the
tone to that of an industrial popcorn popper, or causes some other
unforeseen outcome. Anyone have experience with this that I could
learn from?

I appreciate the input!
…Chuck
jenissi is offline  
Sponsored Links
Advertisement
 
post #2 of 12 (permalink) Old 11-15-2006, 02:58 PM
Senior Member
 
hgree's Avatar
 
Join Date: May 2005
Posts: 165
iTrader: (3)
 
Smile

The screen is just a baffle plate with ~5/32" holes in it. I used an extra long drill bit 3/8" diameter that would reach in to drill mine. One hole on each side made good deal of difference in sound and I didn't have to remove the exhaust.

Out of VN750s...
On to bigger and better things!
1997 Black & Silver ***SOLD***
Insurance Replaced: 08/25/2008
Mileage: 10/29/08- 4644 miles


Son's **Sold: In the ARMY & married $$$**
1995 Teal Green
Purch 08/17/2007: 14,240 miles
10/29/2008: 17,640 miles

Wife's **Sold: shoulder injury**
1999 Gray/Black w/Fairing
Purch 06/22/08: 18,160 miles
10/29/2008: 19,889 miles
hgree is offline  
post #3 of 12 (permalink) Old 11-15-2006, 04:04 PM Thread Starter
Junior Member
 
Join Date: Oct 2006
Posts: 12
iTrader: (0)
 
Follow up

hgree,

When you say you "didn't have to remove the exhaust", are you speaking of the chrome mufflers? If that's the case, then you must have also drilled through that second layer of metal from the exhaust openings that I spoke of. Is that correct or am I totally missing your point? Also, I notice you have regoated from your profile, what was your reasoning?

Thanks.
Chuck
jenissi is offline  
 
post #4 of 12 (permalink) Old 11-15-2006, 11:36 PM
HAWK
 
Ccspinner's Avatar
 
Join Date: Feb 2006
Location: Chicago land
Posts: 2,576
iTrader: (9)
 
Send a message via Yahoo to Ccspinner
I drilled the "Screen" out on mine when I had the Muflers off when I was degoating. The tone is great, not to loud but deep. If you have a long drill or a ling punch you can go through the center hole in the miffler and knock a larger hole in the screen that way. A piece of pointed Rebar works. There is a write up on another form about this for other bikes. Will work for ours to.
Hope this helps

Chad Falstad "Hawk"
Vroc #17649
2011 HD Ultra Classic "angel"
2001 Nomad 1500 Sold March 2012
2001 VN 750 "Sold June with 2008 with 21,000""Serinity"
Ccspinner is offline  
post #5 of 12 (permalink) Old 11-16-2006, 12:53 PM
Senior Member
 
hgree's Avatar
 
Join Date: May 2005
Posts: 165
iTrader: (3)
 
Cool

Quote:
Originally Posted by jenissi
hgree,

When you say you "didn't have to remove the exhaust", are you speaking of the chrome mufflers? If that's the case, then you must have also drilled through that second layer of metal from the exhaust openings that I spoke of. Is that correct or am I totally missing your point? Also, I notice you have regoated from your profile, what was your reasoning?

Thanks.
Chuck
The only panel inside of the muffler is the perforated plate described earlier. Like ccspinner said you can go through the center hole at the exit on muffler and drill without removing muffler. I regoated because of back pressure problems to my carbs that most people don't seem to have and I didn't want my bike so loud. I used the scootworks to degoat and took it back off after encountering carb problems. After regoat, a tad quieter and my neighbor quit complaining when I leave at 4:30 in the morning to work. But the drilling of the mufflers give it a deep rumble without the sharp rap. I will sell the used scootworks kit to anyone if they want it??

Edit: No more carb problems after regoat with no work on carbs... See gas/exhaust posts currently pg 5.

Out of VN750s...
On to bigger and better things!
1997 Black & Silver ***SOLD***
Insurance Replaced: 08/25/2008
Mileage: 10/29/08- 4644 miles


Son's **Sold: In the ARMY & married $$$**
1995 Teal Green
Purch 08/17/2007: 14,240 miles
10/29/2008: 17,640 miles

Wife's **Sold: shoulder injury**
1999 Gray/Black w/Fairing
Purch 06/22/08: 18,160 miles
10/29/2008: 19,889 miles

Last edited by hgree; 11-16-2006 at 01:10 PM.
hgree is offline  
post #6 of 12 (permalink) Old 11-16-2006, 04:25 PM Thread Starter
Junior Member
 
Join Date: Oct 2006
Posts: 12
iTrader: (0)
 
Thanks!

Just the kind of info I was looking for, thanks a lot!
jenissi is offline  
post #7 of 12 (permalink) Old 11-22-2006, 01:02 PM
Benjammin'
 
BSkaggs513's Avatar
 
Join Date: Feb 2006
Location: Ohio, Dayton-Cincy area
Posts: 421
iTrader: (0)
 
Drilling....

Chuck,
You post took the type right out of my figers. I, too was looking for more sound after the drilling of my pipes. Apparently, I didn't go far enough with the drilling as I should have punched out the screen as well (if I go all the posts correct).

Let me know if you decide to "go for it" and your results. I will folow (once I see you haven't destroyed your exhaust).

Ben-
SW Ohio

'02 VN750
Pipes drilled
Spline lubed
R/R relocated
AGM batteried
Iridium equipped
LED tail lighted
8000-ish miled
Soon to be MCCTed

Lovin Life.
BSkaggs513 is offline  
post #8 of 12 (permalink) Old 11-22-2006, 01:18 PM
Members who have donated towards server costs
 
fergy's Avatar
 
Join Date: Mar 2006
Location: Kyle, Texas
Posts: 4,054
iTrader: (3)
   
I'm wanting to understand what you guys are talking about. Hgree, sounds like you drilled X sized hole through the center exit hole at rear of exhaust, giving you a deeper rumble to your exhaust. Do you also have the 3/8" holes drilled around the outside of the plate surrounding the center exit hole? And, if you have both drilled, this didn't have an effect on your carbs? Just wanting to clarify.

Also, what size hole did you drill in the exit hole interior? And about how deep did you have to reach with your extension bit? I have an extension bit but don't know if it would be long enough for that?

Just trying to differentiate between drilling the 3/8" holes and drilling the center exit hole...

Fergy
Kyle, TX VN750.com member #707 VROC#19556
2002 VN1500 Classic
Spline Lube Procedure, with photos, R/R Relocation and Coil Mod
Rusty Tank Cleaning!
Electrical Fault Finding Flowchart
SEAFOAM JUNKIE!


fergy is offline  
post #9 of 12 (permalink) Old 12-26-2006, 03:23 PM
Senior Member
 
hgree's Avatar
 
Join Date: May 2005
Posts: 165
iTrader: (3)
 
Exhaust drilling...

I drilled holes on the outer ring 5/16" diameter 5X on left pipe and 6X on right pipe then with a long 3/8" bit I drilled 2x through the inner screen on each side.

PS... Sorry it took so long to reply. Just before Thanksgiving my Mother had a stroke and my Dad had a heart attack a week later and I have been tending to their therapy, doctor visits and Christmas travel from Oklahoma to NC and back.

Out of VN750s...
On to bigger and better things!
1997 Black & Silver ***SOLD***
Insurance Replaced: 08/25/2008
Mileage: 10/29/08- 4644 miles


Son's **Sold: In the ARMY & married $$$**
1995 Teal Green
Purch 08/17/2007: 14,240 miles
10/29/2008: 17,640 miles

Wife's **Sold: shoulder injury**
1999 Gray/Black w/Fairing
Purch 06/22/08: 18,160 miles
10/29/2008: 19,889 miles

Last edited by hgree; 12-26-2006 at 03:25 PM.
hgree is offline  
post #10 of 12 (permalink) Old 12-26-2006, 03:33 PM
Uber Member
 
Join Date: Feb 2006
Location: Dallas, TX
Posts: 1,280
iTrader: (0)
 
Send a message via AIM to Hizzo3 Send a message via Yahoo to Hizzo3
Quote:
Originally Posted by hgree View Post
I drilled holes on the outer ring 5/16" diameter 5X on left pipe and 6X on right pipe then with a long 3/8" bit I drilled 2x through the inner screen on each side.
Any reason for the different # of holes on the outer rings?

Quote:
Originally Posted by hgree View Post
PS... Sorry it took so long to reply. Just before Thanksgiving my Mother had a stroke and my Dad had a heart attack a week later and I have been tending to their therapy, doctor visits and Christmas travel from Oklahoma to NC and back.
Sorry, hope they get better soon! You and your family have my and sure everyone else's thoughts and prayers.

'04 Vn750
Currently Installed
nat'l cycle deflector shield
westco 12v30 MF, 30A/h w/ 350 CCA's w/ custom box
TOC stator cover w/ Frankenstator mod!
R/R relo

Soon to have (own or on order)
TOC ACCT's
Mez's 110-FRT 170/80-Rear
Custom rear fender and tail light
Givi hard bags w/ custom rear turn signals


Band Engineer/Webmaster for Josey Contreras Tejano Band
Hizzo3 is offline  
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

Once registered, your User Name"cannot be changed". We can make exceptions within 7 days, but after that, it is set in stone.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome