mac exhaust jetting - The GSResources Forums

Required reading for all forum users!!!

Welcome!
Register to access the full functionality of the GSResources forum. Until you register and activate your account you will not have full forum access, nor will you be able to post or reply to messages.

A note to new registrants...
All new forum registrations must be activated via email before you have full access to the forum.

A Special Note about Email accounts!
DO NOT USE sbcglobal.net, att.net, bellsouth.net or email.com email addresses when registering for the forum! Email that our system sends out to these email servers is treated as SPAM and you will never receive your activation email, or any other email that our system may send out. Use an email address from gmail.com or some other email server.

A note to old forum members...
I receive numerous requests from people who can no longer log in because their accounts were deleted. As mentioned in the forum FAQ, user accounts are deleted if you haven't logged in for the past 6 months. If you can't log in, then create a new forum account. If you don't get an error message, then check your email account for an activation message. If you get a message stating that the email address is already in use, then your account still exists so follow the instructions in the forum FAQ for resetting your password.

Have you forgotten your password or have a new email address? Then read the forum FAQ for details on how to reset it.

Any email requests for "can't log in anymore" problems or "lost my password" problems will be deleted. Read the forum FAQ and follow the instructions there - that's what we have one for...
New users should be sure to read the FAQ as well as the posts in the Announcements forum. This will answer many of the questions you may have about how this forum works.

Before posting questions in the forums be sure to use the forum search function!!! Odds are your question has already been asked and answered before. And when posting, please make sure that you post to the correct forum.

Finally, be sure to check out BassCliff's website here. He has useful information that can't be found on this site. His welcome page containing useful GS information can be found here. Be sure to check it out!
If you are a returning visitor to the forum and can't log in using your old forum name and password, chances are your account is deleted. Just create a new forum account and you should be all set.

X

timebombprod

Forum Sage

Join Date: Nov 2019

Posts: 1716

Location: spring hill florida
#1

mac exhaust jetting

12-24-2019, 05:40 PM

hey guys happy christmas eve just have a question about jetting.

ive been told that stock jetting works best on the mac exhausts with stock airbox and the stock airfilter.

to people that have had a bike with a mac exhaust before, is this true? which exhaust was it? im looking at the megaphone and the reverse cone.

if putting the mains up 1 size doesnt hurt ill be doing that but if u guys think stock works better otherwise please let me know

Ian

1982 GS650GLZ
1982 XS650
Tags: None
Rob S.

Forum Guru

Past Site Supporter

Join Date: Dec 2013

Posts: 9856

Location: New York City
#2

12-28-2019, 11:35 AM

As far as I know, it's the intake, rather than the exhaust, that causes the need for rejetting. If it ain't broke...give it to me. I can break it.

1982 GS1100E V&H "SS" exhaust, APE pods, 1150 oil cooler, 140 speedo, 99.3 rear wheel HP, black engine, '83 red

2016 XL883L sigpic Two-tone blue and white. Almost 42 hp! Status: destroyed, now owned by the insurance company. The hole in my memory starts an hour before the accident and ends 24 hours after.
Comment
Who Dat?

Forum Mentor

Join Date: Jun 2012

Posts: 462

Location: On the edge.
#3

12-28-2019, 12:42 PM

Really??? I appreciate asking questions on a forum as much as the next guy, but ...

https://www.thegsresources.com/_forum/showthread.php?257275-1982-gs650-baffles&highlight=

https://www.thegsresources.com/_forum/showthread.php?257276-82-gs650-4-1-exhaust&highlight=

running straightpipes - The GSResources Forums

https://www.thegsresources.com/_forum/showthread.php?257277-running-straightpipes&highlight=

Place your GS carburetor, fuel or exhaust questions in this forum.

MAC 4-1 megaphone exhaust - The GSResources Forums

https://www.thegsresources.com/_forum/showthread.php?257288-MAC-4-1-megaphone-exhaust&highlight=

Place your GS carburetor, fuel or exhaust questions in this forum.

jetting sizes for airbox and exhaust - The GSResources Forums

https://www.thegsresources.com/_forum/showthread.php?257310-jetting-sizes-for-airbox-and-exhaust&highlight=

Place your GS carburetor, fuel or exhaust questions in this forum.

airbox and mac 4-1 with competition baffles. - The GSResources Forums

https://www.thegsresources.com/_forum/showthread.php?257363-airbox-and-mac-4-1-with-competition-baffles&highlight=

Place your GS carburetor, fuel or exhaust questions in this forum.

black/chrome mac exhaust - The GSResources Forums

https://www.thegsresources.com/_forum/showthread.php?257374-black-chrome-mac-exhaust&highlight=

Put any information that you have to make your bike look great in here.

megaphone or reverse cone - The GSResources Forums

https://www.thegsresources.com/_forum/showthread.php?257417-megaphone-or-reverse-cone&highlight=

Place your GS carburetor, fuel or exhaust questions in this forum.

heat wrapping headers - The GSResources Forums

https://www.thegsresources.com/_forum/showthread.php?257403-heat-wrapping-headers&highlight=

Place your GS carburetor, fuel or exhaust questions in this forum.

https://www.thegsresources.com/_forum/showthread.php?257430-mac-exhaust-jetting&highlight=

TEN separate threads, all asking the same basic question.

If you're not living on the edge, you're taking up too much space.
Comment
timebombprod

Forum Sage

Join Date: Nov 2019

Posts: 1716

Location: spring hill florida
#4

12-28-2019, 10:31 PM

Originally posted by Who Dat? View Post

Really??? I appreciate asking questions on a forum as much as the next guy, but ...

https://www.thegsresources.com/_forum/showthread.php?257275-1982-gs650-baffles&highlight=

https://www.thegsresources.com/_forum/showthread.php?257276-82-gs650-4-1-exhaust&highlight=

running straightpipes - The GSResources Forums

https://www.thegsresources.com/_forum/showthread.php?257277-running-straightpipes&highlight=

Place your GS carburetor, fuel or exhaust questions in this forum.

MAC 4-1 megaphone exhaust - The GSResources Forums

https://www.thegsresources.com/_forum/showthread.php?257288-MAC-4-1-megaphone-exhaust&highlight=

Place your GS carburetor, fuel or exhaust questions in this forum.

jetting sizes for airbox and exhaust - The GSResources Forums

https://www.thegsresources.com/_forum/showthread.php?257310-jetting-sizes-for-airbox-and-exhaust&highlight=

Place your GS carburetor, fuel or exhaust questions in this forum.

airbox and mac 4-1 with competition baffles. - The GSResources Forums

https://www.thegsresources.com/_forum/showthread.php?257363-airbox-and-mac-4-1-with-competition-baffles&highlight=

Place your GS carburetor, fuel or exhaust questions in this forum.

black/chrome mac exhaust - The GSResources Forums

https://www.thegsresources.com/_forum/showthread.php?257374-black-chrome-mac-exhaust&highlight=

Put any information that you have to make your bike look great in here.

megaphone or reverse cone - The GSResources Forums

https://www.thegsresources.com/_forum/showthread.php?257417-megaphone-or-reverse-cone&highlight=

Place your GS carburetor, fuel or exhaust questions in this forum.

heat wrapping headers - The GSResources Forums

https://www.thegsresources.com/_forum/showthread.php?257403-heat-wrapping-headers&highlight=

Place your GS carburetor, fuel or exhaust questions in this forum.

mac exhaust jetting - The GSResources Forums

https://www.thegsresources.com/_forum/showthread.php?257430-mac-exhaust-jetting&highlight=

Place your GS carburetor, fuel or exhaust questions in this forum.

TEN separate threads, all asking the same basic question.

i guess its because i never got it answered. i just ended up emailing MAC for what i need, never done this so had no clue i could call the company for the specs i need. also i ended up finding a different exhaust after i posted some about the megaphone, there wont be another one.

Ian

1982 GS650GLZ
1982 XS650
Comment
rphillips

Forum Guru

Past Site Supporter
Super Site Supporter

Join Date: Jun 2005

Posts: 7795

Location: Norene TN
#5

12-28-2019, 11:01 PM

A different exhaust, hopefully that's a good thing, there's few good words about the Mac, but for what you need, very few options. What did you find. Back in the day, My V&H came with instructions for air box mods & jetting suggestions. Didn't know if that would be legal anymore. Looks like you're doing your homework, keep it up.

1983 GS1100E, 1983 CB1100F, 1991 GSX1100G, 1996 Kaw. ZL600 Eliminator, 1999 Bandit 1200S, 2005 Bandit 1200S, 2000 Kaw. ZRX 1100
Comment
timebombprod

Forum Sage

Join Date: Nov 2019

Posts: 1716

Location: spring hill florida
#6

12-29-2019, 07:29 AM

Originally posted by rphillips View Post

A different exhaust, hopefully that's a good thing, there's few good words about the Mac, but for what you need, very few options. What did you find. Back in the day, My V&H came with instructions for air box mods & jetting suggestions. Didn't know if that would be legal anymore. Looks like you're doing your homework, keep it up.

its a Mac reverse cone exhaust its a 1 piece but it has a welded in baffle. still waiting for an answer from them lol but it looks good and i heard it on a cb750 and it sounded really nice its what i want.

Ian

1982 GS650GLZ
1982 XS650
Comment
Rob S.

Forum Guru

Past Site Supporter

Join Date: Dec 2013

Posts: 9856

Location: New York City
#7

12-29-2019, 08:13 AM

Originally posted by timebombprod View Post

...I heard it on a cb750 and it sounded really nice its what i want.

Reminds of the very moment I fell in love with 4-into-1s. Or at least the first moment I realized it was the pipe, not the bike. I was standing near the boulevard and a CB750, laden with two men roared by. That's when I learned you could make a stock CB750 sound like a big-bore Kawasaki.

Point being, you can get that sound from almost any 4-into-1 by adjusting the baffle.

1982 GS1100E V&H "SS" exhaust, APE pods, 1150 oil cooler, 140 speedo, 99.3 rear wheel HP, black engine, '83 red

2016 XL883L sigpic Two-tone blue and white. Almost 42 hp! Status: destroyed, now owned by the insurance company. The hole in my memory starts an hour before the accident and ends 24 hours after.
Comment
rphillips

Forum Guru

Past Site Supporter
Super Site Supporter

Join Date: Jun 2005

Posts: 7795

Location: Norene TN
#8

12-29-2019, 11:52 AM

Just looked on ebay, Powersports superstore has them for $275 & free S/H, all others look like over $400. What's the deal???

1983 GS1100E, 1983 CB1100F, 1991 GSX1100G, 1996 Kaw. ZL600 Eliminator, 1999 Bandit 1200S, 2005 Bandit 1200S, 2000 Kaw. ZRX 1100
Comment
timebombprod

Forum Sage

Join Date: Nov 2019

Posts: 1716

Location: spring hill florida
#9

12-30-2019, 05:21 AM

Originally posted by rphillips View Post

Just looked on ebay, Powersports superstore has them for $275 & free S/H, all others look like over $400. What's the deal???

i think its a closeout sale, i just say im lucky

Ian

1982 GS650GLZ
1982 XS650
Comment
timebombprod

Forum Sage

Join Date: Nov 2019

Posts: 1716

Location: spring hill florida
#10

12-30-2019, 09:54 AM

Originally posted by Rob S. View Post

Reminds of the very moment I fell in love with 4-into-1s. Or at least the first moment I realized it was the pipe, not the bike. I was standing near the boulevard and a CB750, laden with two men roared by. That's when I learned you could make a stock CB750 sound like a big-bore Kawasaki.

Point being, you can get that sound from almost any 4-into-1 by adjusting the baffle.

it says that it has a "straight thru" baffle so i dont know what it is but the video i watched it in it wasnt really raspy or anything like that very clean smooth sound.

https://www.youtube.com/watch?v=ohA4HjB6skE heres that video

Last edited by timebombprod; 12-30-2019, 09:57 AM.

Ian

1982 GS650GLZ
1982 XS650
Comment
Rob S.

Forum Guru

Past Site Supporter

Join Date: Dec 2013

Posts: 9856

Location: New York City
#11

12-30-2019, 11:14 AM

Originally posted by timebombprod View Post

it says that it has a "straight thru" baffle...

I think straight through is what you want. Your neighbors are another matter.

1982 GS1100E V&H "SS" exhaust, APE pods, 1150 oil cooler, 140 speedo, 99.3 rear wheel HP, black engine, '83 red

2016 XL883L sigpic Two-tone blue and white. Almost 42 hp! Status: destroyed, now owned by the insurance company. The hole in my memory starts an hour before the accident and ends 24 hours after.
Comment

Previous template Next

Working...

X