Today my exhaust snapped right at the point where the can meets the pipe. Open pipes was cool for the first five minutes but got pretty obnoxious soon there after. I plan to pick up a stock exhaust but this is my only mode of transportation so I will probably have to ride it (did about 20miles today) with straight pipes until I can source a new exhaust. Before the break my bike was showing signs of tight exhaust valves. How long can I do this before worrying about burnt valves and other nastiest popping up. Thanks
If your valves are tight now with no can it might be doing damage now maybe. I stress maybe. Best get it sorted ASAP and limit riding.
I plan to check valves and hunt down an exhaust tomorrow. Hoping I didn't cause any damage today but time will tell I guess.
There's no way to jury rig the muffler back on? I think even a slightly competent welder could get it back on (however ugly afterwards).
Quote from: Big Rich on April 23, 2012, 10:16:36 PM
There's no way to jury rig the muffler back on? I think even a slightly competent welder could get it back on (however ugly afterwards).
Good idea, I will call a couple of local exhaust shops and see what they can do for me.
or just go down to like advanced auto and get a pipe sleeve and some exhaust sealant to fill in any gaps.
Quote from: Tombstones81 on April 24, 2012, 06:10:52 AM
or just go down to like advanced auto and get a pipe sleeve and some exhaust sealant to fill in any gaps.
would that work if the break is right where the can and pipe connect with no excess pipe on the can side?
if there isnt enough pipe on both ends, then no.
some might be able to help better with a photo of it tho.
you could always do the jd-weld ghetto fix temporarily. doesn't have to be pretty.
Gak. Don't ghetto-rig it up. It will cost less and be more permanent to just drive the bike with the can to a muffler shop and have them fix it. It will take little time and money to do it this way... call around first if you need to.
Took her up to the local muffler place and the guy working there said that the welding wouldn't be a viable option and that i should just source a new exhaust. I might take it somewhere else and see what they say. Here what I'm working with, what do you guys think.
(http://i1229.photobucket.com/albums/ee462/justsumguy1/20120424_142351.jpg)
(http://i1229.photobucket.com/albums/ee462/justsumguy1/20120424_142250.jpg)
Any semi competent welder could fix that. Sounds like the didn't want to do a little prep work with the grinder for a small weld. It would involve cleaning up the edges and beveling or removing most of the existing weld the about two minutes to weld it back. Might have to tweak you bracket a bit as well.
There's enough pipe left to be alright. It'll make it run a tad lean and backfire and crap but overall I wouldn't say there's any immediate risk of damage. In the interim you could stuff some steel wool down in there (stainless steel kind if you can find it) and use some type of metal screen and high-temp tape to hold it in. Just a thought...though it would probably be easier to just have somebody weld it. It's easily done - you could probably do it yourself if you have access to a welder.
Mmmm, looks like one of those short stepped pieces of home fix-it exhaust pipe could fix that good enough to get you by until you source a replacement stock exhaust. If you could find one that will go over the broken exhaust pipe end with it's big end and into muffler a ways with it's small end. Put a clamp on the pipe/pipe joint and several sheet metal screws thru the muffler end into the little pipe. Just a thought, I'd try it.
You can go for 15 minutes before your open pipes risk damage, according to OSHA noise regulations.
I have a related question. I just got my Yoshi TRS and am waiting on buddha's jet kit to come in the mail... can I put it on now and ride for a few days without damage, or should I wait till I have both ?
Quote from: Vo0Do0 on April 24, 2012, 05:58:48 PM
I have a related question. I just got my Yoshi TRS and am waiting on buddha's jet kit to come in the mail... can I put it on now and ride for a few days without damage, or should I wait till I have both ?
People routinely put new pipes on bikes without rejetting. It's not going to hurt anything. Might make a small impact on performance but that's it. Expect to use the choke more, especially if it's cold.
Quote from: Kijona on April 24, 2012, 06:20:20 PM
People routinely put new pipes on bikes without rejetting. It's not going to hurt anything. Might make a small impact on performance but that's it. Expect to use the choke more, especially if it's cold.
THANKYOU!!! just what I wanted to hear... I think I might right now, go put my new exhaust on... will check back at last second before cutting to make sure no one screams "NOOO!!" ... (Im new to this stuff and dont wanna damage anything lol)
Quote from: Vo0Do0 on April 24, 2012, 06:39:03 PM
Quote from: Kijona on April 24, 2012, 06:20:20 PM
People routinely put new pipes on bikes without rejetting. It's not going to hurt anything. Might make a small impact on performance but that's it. Expect to use the choke more, especially if it's cold.
THANKYOU!!! just what I wanted to hear... I think I might right now, go put my new exhaust on... will check back at last second before cutting to make sure no one screams "NOOO!!" ... (Im new to this stuff and dont wanna damage anything lol)
I think where people run into problems is after thousands of miles without rejetting. It leans out the already lean mixture and burns the valves up after a while. It takes a really long time, though. For a hundred or two...you'll be fine. It's not like you're putting 4" straight pipes on. The header/mid-pipe on the GS is pretty long. Even with a straight pipe it would most likely be okay. Slip-on? Sure, no problem. Does it have a removable baffle? Put the baffle in if it does.
It's all about restriction and back pressure. Slip-ons are usually louder which is an indication of being less restrictive and visa versa. More restriction equals more back pressure which makes the mixture slightly rich. Less restriction makes it run slightly leaner. That's why a lot of bikes that have slip-ons backfire a lot (not during deceleration - that's detonation which is different). They don't rejet them and it causes it to backfire. Don't worry about popping in the can while using engine braking - that's something you'll run into with anything other than stock. It's because of the less restrictive nature of slip-ons.
Ty for help Kijona... its on and its great !!
I'm very confused. Why would running open pipes damage valves? :confused:
I don't know what you're talking about, the slash cut pipe is looking fine to me. ;)
Quote from: Byard on April 25, 2012, 04:38:53 AM
I'm very confused. Why would running open pipes damage valves? :confused:
Because when you open the exhaust it leans out the mixture. A lean mixture will cause excessive heat in the combustion chamber. This heat is especially bad around the exhaust valves. the first thing you will see is your valve clearance and valve seal problems. Eventually you will burn the exhaust valves up.
How do you know if you're running too lean? Simple check your plugs, pure white is bad (too lean), white on one side (a little lean), even gray possibly with a red tint (perfect), black (too rich).
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Quote from: Manaenrc on April 25, 2012, 04:54:31 AM
Quote from: Byard on April 25, 2012, 04:38:53 AM
I'm very confused. Why would running open pipes damage valves? :confused:
Because when you open the exhaust it leans out the mixture. A lean mixture will cause excessive heat in the combustion chamber. This heat is especially bad around the exhaust valves. the first thing you will see is your valve clearance and valve seal problems. Eventually you will burn the exhaust valves up.
How do you know if you're running too lean? Simple check your plugs, pure white is bad (too lean), white on one side (a little lean), even gray possibly with a red tint (perfect), black (too rich).
To expound on what you said...
The effect backpressure has on engine mixture is far less profound on 4-stroke motors versus 2-stroke but it's still there. The shorter the pipe is, the less backpressure there is. Being knocked off right there at the muffler isn't really a huge problem but it will be way, way down the line.
If the pipes are short enough, they can pull cool air back in and warp the valves (due to being constantly heated and cooled).
Thanks to Kijona and everyone who offered advice and suggestions, its good to hear that I most likely haven't done any damage. Im picking up an exhaust from a gstwin member tomorrow so I wont have to fix this one. Anyone interested in a custom gs500 straight racing pipe?
Quote from: mysterious_rider on April 25, 2012, 04:44:11 AM
I don't know what you're talking about, the slash cut pipe is looking fine to me. ;)
To be honest I like the slash cut look too but hate the sound, too chopper like. If it were an I4, however, I might have had to run with it for a little while longer
Quote from: termlifed on April 25, 2012, 05:17:41 PM
Thanks to Kijona and everyone who offered advice and suggestions, its good to hear that I most likely haven't done any damage. Im picking up an exhaust from a gstwin member tomorrow so I wont have to fix this one. Anyone interested in a custom gs500 straight racing pipe?
Quote from: mysterious_rider on April 25, 2012, 04:44:11 AM
I don't know what you're talking about, the slash cut pipe is looking fine to me. ;)
To be honest I like the slash cut look too but hate the sound, too chopper like. If it were an I4, however, I might have had to run with it for a little while longer
No problem man. You might offer it up on the FS/FT area. If it's in good shape without any rust or anything it will probably get snatched up quick - lots of people have rusty headers.