So I have never tried to mod a motorcycle before but i want to Cafe/bob out my '93 gs500e. The first thing I was thinking of doing was cutting off the exhaust (or the big can at least). I just want to know what effects this will have on my bike? Will i lose power/speed/acceleration? And will I have to do any carb adjusting or re-jetting? I really want to cut this off like ASAP I just don't want to comepletely ruin my bike. Help???
It sounds like complete shaZam! when it's muffler less. My muffler weld broke so I took it off for fun. Welded it right back on.
Did you notice any difference in power or acceleration?
Nope, just pissed off the neighbors
For sure lol. I still want to try it just to hear it, I can easily weld it back on if it is crazy annoying though. Other than it being obnoxious were there any issues with it off like overheating or running too lean? I Just don't want to effect my bikes health haha just for a cut muffler and loud exhaust.
I think it might have an effect on the back-pressure the engine might need, but I'm not a mechanic. . .
I'll tell you the truth all around: it's a bad idea.
Every cop you roll past will be happy to have a chat with you. Every neighbor will hate you. You'll lose power from the engine at all rpm ranges (except for a very narrow band that you will never use). And lastly, there won't be anything else supporting the rest of your exhaust, so it can actually rattle itself to death.
Seriously, it's a terrible idea.
Quote from: Big Rich on May 04, 2016, 10:16:36 AM
I'll tell you the truth all around: it's a bad idea.
Every cop you roll past will be happy to have a chat with you. Every neighbor will hate you. You'll lose power from the engine at all rpm ranges (except for a very narrow band that you will never use). And lastly, there won't be anything else supporting the rest of your exhaust, so it can actually rattle itself to death.
Seriously, it's a terrible idea.
Yeah you're right... Taking all of that into consideration it probably isn't the best idea. But damn what should I do then I definitely want a shorter exhaust pipe, I think that looks better in general. Any muffler suggestions?
http://imgur.com/pK7f6x9
I'm cutting down the back end of the frame as well for just a single seat. This is all starting tonight after work lol...
They make shorty aftermarket mufflers, and I'd weld support tabs on somewhere. . .
You guys and your silly back pressure horse crap. You are clearly misguided in the realm of exhaust gas escape velocity. You can achieve zero back pressure with high escape velocity and make more power in way thats safe for the engine. Engines are air pumps! you want the engine pulses to leave the exhaust in an efficient manor.
Quote from: syntax_error on May 09, 2016, 06:31:33 AM
You guys and your silly back pressure horse crap. You are clearly misguided in the realm of exhaust gas escape velocity. You can achieve zero back pressure with high escape velocity and make more power in way thats safe for the engine. Engines are air pumps! you want the engine pulses to leave the exhaust in an efficient manor.
If you're a drag-racer, yes. For every-day riding, you'll have no power, piss off everyone, lose all your hearing, and quite possibly have your bike impounded. But hey, its a free country (in America, at least), so do what you want. . .
Im not trying to start a war here. You are not correct in your statement. This is not racing technology. It is healthy engine technology. The only time the gs engine especially would benefit from back pressure would be in the 8000rpm range and above. For low end torque you would want free flowing fast escaping exhaust velocity. I run a properly jetted and debaffled exhaust and experience no issues with it what so ever. Plugs are the color of creamy peanut butter and oil always looks fresh as new. People will do what they want to do. Research the engineering involved before making blanket statement about the subject. There is a natural step down in motorcycle exhaust in the collector and where the slip is. This is were your back pressure will come from. Removing the baffle on the later system is easier to compensate for as the Pulse air induction read valve helps the system out greatly. and can be modded very easily to add in reducing crank case vacuum.
Syntax, I'm curious as to what exactly you're talking about. I reread all the posts in this thread and it looked to me like the OP wanted to cut his muffler off, and everybody basically told him reasons not to do it.
Sure, back pressure was brought up, and it's a common mis-used term when it comes to exhaust flow. But I'm not understanding what got you worked up (for lack of a better term).
I've tried to research exhaust flow as much as I can (remember, I'm a machinist and not an engineer). So if you have more details about the science of exhaust flow / noise reduction / and horsepower, I'm all ears.
Your right. My bad. Was kinda trollish. Passion got the best of me. An electric butterfly right before the the slip would give you the best of both worlds although I doubt it could be jetted to accommodate both running scenarios.
Thanks to everyone who replied on this post... Seriously, helped my decision making a lot, so much appreciated!!
I have decided to keep on my stock exhaust until I just buy an aftermarket muffler. Probably the safest and smartest choice for a noob like me. I will be starting up my project here in about a week so I'll start a new project thread to show how it goes!!
But hey since I couldn't cut the muffler I had to cut something. So I shaved off the stock mudflap from the back end of the bike to make a ghetto DIY fendor eliminator (until I actually buy one haha).
http://imgur.com/e0fJY3A
Oh yeah and last thing, took my first spill the other night on her :sad: ... The rain caught me on the way home, not fun... :bs:
That looks good Brax! I don't think they actually make a fender eliminator kit for the GS but I could be wrong... seems that everyone does custom like you and cuts off as much as they want :thumb:
I went a step further and cut the whole thing. I made aluminum brackets for the license plate and mounted my signals (from an '04 gixxer... the GS ones were quite long!) up on the rear plastics.
I'm sorry to hear about your spill! You okay? My favorite thing someone told me when I first started riding was, "There are two kinds of riders... those who have gone down and those who will." Now that you've gotten that out of the way, ride on 8)
Keep us posted on what else you do to the bike!! :thumb:
Quote from: ShowBizWolf on May 09, 2016, 11:21:47 AM
That looks good Brax! I don't think they actually make a fender eliminator kit for the GS but I could be wrong... seems that everyone does custom like you and cuts off as much as they want :thumb:
I went a step further and cut the whole thing. I made aluminum brackets for the license plate and mounted my signals (from an '04 gixxer... the GS ones were quite long!) up on the rear plastics.
I'm sorry to hear about your spill! You okay? My favorite thing someone told me when I first started riding was, "There are two kinds of riders... those who have gone down and those who will." Now that you've gotten that out of the way, ride on 8)
Keep us posted on what else you do to the bike!! :thumb:
Thanks lol I'm glad you don't think it looks like complete sh*t ha! Yeah I'm alright I wasn't going very fast just wasn't expecting it to slip out form under me!! Good thing I had my guardian bell :angel: haha. I'll most definitely keep everyone updated on how it's turning out! Thanks again for the concern!! Definitely woke me up a bit to riding lol.
I have a bell too..! My mom bought it for me :embarassed: :kiss3:
Quote from: ShowBizWolf on May 09, 2016, 11:44:47 AM
I have a bell too..! My mom bought it for me :embarassed: :kiss3:
Had to "Google" that.
When I told my mom I bought a motorcycle she nodded and looked away from me. She turned back to me and asked, "What's a 'motorcycle'?"
Glad you're ok.
I got my muffler from here and it was inexpensive and looks great
http://shop.rycamotors.com/exhaust_mufflers_category.html
Quote from: lucas on May 09, 2016, 04:58:33 PM
Glad you're ok.
I got my muffler from here and it was inexpensive and looks great
http://shop.rycamotors.com/exhaust_mufflers_category.html
Thanks! I came back to it this morning to look at any damage and I messed up my left speedo and had to re-attach some weird spinning thing that was connected to my rpm reader(tachometer i think?). But other than that she is still running perfectly lol.
This is a great site as well I'll definitely look into it more after work!
It has been raining so I have been procrastinating getting started on it. But tomorrow morning or the day after I'm chopping the tail and throwing on a solo seat.... Well maybe a solo seat lol
... bobbernation!! .. :icon_eek: ;)
Riding motos is like riding horses. eventually youll go down. it happens. at least it was minor Eh?. anyhoo a month before my ankle fiasco started, went horse riding on friends property. had a forced dismount. horse looked at me i think saying "AAAAAND the score is, horse 1 human 0. got up, dusted self off and re mounted. ( minor ankle twist) my first gs did same thing. was used to R slow turn but not L . ( recalling MSF) did a 2----1 panic stop then back into1 and a r turn back to group. tried this L hand and she fell over like a drunken barfly. i laughed. picked itt up and kept going. ANYHOO. the exhaust, i tried open header when i did the gsxr wedge can conversion. it ran albeit poorly. had to rejet after. imho i love the gs but she doesnt sound good open pipe. but to each his or her own. do whats right for the both of you. ( you and bike)
Aaron
Quote from: yamahonkawazuki on May 11, 2016, 02:20:17 AM
Riding motos is like riding horses. eventually youll go down. it happens. at least it was minor Eh?. anyhoo a month before my ankle fiasco started, went horse riding on friends property. had a forced dismount. horse looked at me i think saying "AAAAAND the score is, horse 1 human 0. got up, dusted self off and re mounted. ( minor ankle twist) my first gs did same thing. was used to R slow turn but not L . ( recalling MSF) did a 2----1 panic stop then back into1 and a r turn back to group. tried this L hand and she fell over like a drunken barfly. i laughed. picked itt up and kept going. ANYHOO. the exhaust, i tried open header when i did the gsxr wedge can conversion. it ran albeit poorly. had to rejet after. imho i love the gs but she doesnt sound good open pipe. but to each his or her own. do whats right for the both of you. ( you and bike)
Aaron
Thanks for the advice!! Probably not gonna just chop it off anymore, I'll get a shorter aftermarket or something along those lines. As the week passes I am slowly changing my mind on how I want it to look haha :icon_rolleyes:
Congrats on the bike and sorry you took a spill! I've been pretty lucky, put 12k on my GS with no incidents, statistically I'll probably be in for it soon. :icon_eek:
I can't imagine what kind of unholy racket a GS would make without a can, but I'm thinking you made the wise decision. :) I've got a Yoshi pipe on my wishlist, but holding off as I'm pinching pennies for some track days and another bike. :dunno_black:
I'm very new here and I don't want to come off as a know-it-all or a hooligan..
However with that being said. You can certainly chop off the muffler but expect the bike to run very lean without any changes to the carb jets. I'm 99% sure the intake flow has a stronger effect on the need to rejet though however. But even with a stock intake I'd expect rejetting to be pretty much mandatory on something that suddenly has a straight pipe exhaust.
My main jets are 150's with pod filters on the intake and no restriction whatsoever in the exhaust system and the engine runs better than it ever did. I'm lucky to live somewhere heavily populated with loud Harley Davidsons but that being said the bike is still loud enough to piss off neighbors.
And sorry to hear about the spill as well.
(http://uploads.tapatalk-cdn.com/20160608/9d43c95b061bca541310f8775e661371.jpg) I just bought muffler insert and done job spot on
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Start the countdown for Buddhafest! ;)