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Old 05-02-2009, 09:16 AM   #1
JohnnyRingo
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Default Home built exhaust question

Just a brief question for the DIY's among us. If you have the equipment to bend/cut/weld pipe at home, how tough is it to actually build your own exhaust system? Seems like a lot of basic parts aren't terribly difficult, just time consuming and equipment-intensive. Is this the case with exhaust? Just curious. Thanks for any feedback.

-R.
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Old 05-02-2009, 02:08 PM   #2
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Yep it's the same with making any custom work always measure twice and cut/bend once.
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Old 05-02-2009, 03:32 PM   #3
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What kind of bike is it going on? Is it carbureted or injected? And is the goal performance or looks?
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Old 05-02-2009, 03:53 PM   #4
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Going on an '06 suzuki s40. And the ideal purpose is aesthetics. I think the stock pipes look a little anemic. Not to mention they are dented to hell from the wreck.

-R
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Old 05-02-2009, 04:23 PM   #5
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Quote:
Originally Posted by JohnnyRingo View Post
Going on an '06 suzuki s40. And the ideal purpose is aesthetics. I think the stock pipes look a little anemic. Not to mention they are dented to hell from the wreck.

-R
The S40's injected, right? Can you get a PowerCommander or other ignition mapping device for it? I don't know cruisers, but I'm sure you wouldn't want the bike to run like crap, load up or burn a piston...
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Old 05-02-2009, 04:46 PM   #6
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Yea I've done enough to hurt that poor bike already. I'm guessing the ignition mapping would....what? Tell me whether or not I need a special consideration or considerations for what I can throw on it?

-R.
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Old 05-02-2009, 05:56 PM   #7
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The S40 is NOT fuel injected. If you build a custom exhaust you will have to rejet the carb.
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Old 05-02-2009, 06:26 PM   #8
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Quote:
Originally Posted by JohnnyRingo View Post
Yea I've done enough to hurt that poor bike already. I'm guessing the ignition mapping would....what? Tell me whether or not I need a special consideration or considerations for what I can throw on it?

-R.
Changing pipes will change the way the bike breathes. A PowerCommander (PC) would allow you to adjust the fuel mix accordingly. On fuel injected bikes, whenever you change intake or exhaust, 90% of time they need to be remapped...

With an aftermarket pipe and a PowerCommander, you can usually download the correct map and upload it to your bike. With a custom pipe, like you're proposing, you'd likely need to get the bike dyno'ed to net the correct map. Without a PC or other ignition mapper though, how the bike ran would be a crap-shoot!
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Old 05-02-2009, 09:14 PM   #9
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Quote:
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The S40 is NOT fuel injected. If you build a custom exhaust you will have to rejet the carb.
Thanks Prim. I had totally neglected the question. Essentially rejetting the carb would have the same net effect as mapping the ignition and all, right? I mean, ultimately I have to change up the fuel mix? Which is more of a pita, the powercommander route, or the rejet?

-R.
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Old 05-02-2009, 10:23 PM   #10
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Quote:
Originally Posted by primalmu View Post
The S40 is NOT fuel injected. If you build a custom exhaust you will have to rejet the carb.
Cool! Jets are cheaper than a PowerCommander!
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Old 05-02-2009, 10:53 PM   #11
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Any tutorials anywhere about how to go about jetting a carb?
(The noob questions keep on comin'!)

-R.
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Old 05-02-2009, 11:05 PM   #12
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What type of bending machine do you have? If it can't do mandrel bends,...your waisting your time. Unless you just what to say I did it myself.
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Old 05-03-2009, 10:10 PM   #13
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Quote:
Originally Posted by JohnnyRingo View Post
Which is more of a pita, the powercommander route, or the rejet?
This is a null point, since you don't have the option of the PowerCommander.

I personally don't know how easy it will be. It will certainly be trial and error to get the fuel mix right. The good news is you only have one carb to deal with.
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Old 05-04-2009, 12:35 AM   #14
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Quote:
Originally Posted by JohnnyRingo View Post
Any tutorials anywhere about how to go about jetting a carb?
(The noob questions keep on comin'!)

-R.
Ya know... Jetting the carb is gonna a walk in the park compared to building your own exhaust.

I know my way around bikes pretty well and have jetted and remapped many, but I would NEVER try to engineer and build an exhaust system myself! That's WAAAY over my head!
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Old 05-04-2009, 10:15 AM   #15
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Quote:
Originally Posted by JohnnyRingo View Post
Thanks Prim. I had totally neglected the question. Essentially rejetting the carb would have the same net effect as mapping the ignition and all, right? I mean, ultimately I have to change up the fuel mix? Which is more of a pita, the powercommander route, or the rejet?

-R.
Changing the jets is for carbed bikes, the power commander changes the computerized fuel mixture in electronic fuel injected bikes.
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Old 05-05-2009, 10:52 AM   #16
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youtube has a couple tutorials on rejetting. it seem intimadating, but i did it and i'm dumb!. take yer time and dont loose any parts! ha
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