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Exhaust/Fuel HELP!

  • Thread starter Thread starter VintageWWII
  • Start date Start date
V

VintageWWII

Guest
So i'm a bit confused on what I should do next. I was riding on the highway when i heard my bike get extremely loud, at first i was like wow it must be the surrounding walls making it sound louder but when i got off, the loud noise was still there, and I look down and my 24" muffler is gone and whats left is a my header section. Now i rode about a couple blocks and actually found it and put it back on. The sound was a bit different, don't really like how it sounded but by the end of night. It became extremely loud, the engine was a bit smoking, very very hot, I can feel it and a shot load of backfire. Now i don't know what to do next? Re jet? Change exhaust? The muffler got a bit damaged and here are some pictures of it, help me out!

 
Hmm.... Have you put a sync tool to the carbs? the smoke makes me think running rich and the running hot could be its running rich enough to dump gas into the oil like its not firing at the right position of the piston. Had that problem with my virago until
i synced the carbs
 
Leland1 said:
Hmm.... Have you put a sync tool to the carbs? the smoke makes me think running rich and the running hot could be its running rich enough to dump gas into the oil like its not firing at the right position of the piston. Had that problem with my virago until
i synced the carbs
Click to expand...

I don't but that's what I was thinking, I was thinking it went out of sync because I was riding like a couple blocks (fell off right before my job) pretty much without the muffler.
 
VintageWWII said:
I don't but that's what I was thinking, I was thinking it went out of sync because I was riding like a couple blocks (fell off right before my job) pretty much without the muffler.
Click to expand...

That wouldn't cause your carbs to go out of sync.
 
UncleMike said:
That wouldn't cause your carbs to go out of sync.
Click to expand...

Hmmm, then what could it be? Everything was perfect, this happened, now i'm running really hot, really loud, and backfiring out the ass. I hope it's just as simple as a muffler swap anyhow? Any more input?
 
VintageWWII said:
Hmmm, then what could it be? Everything was perfect, this happened, now i'm running really hot, really loud, and backfiring out the ass. I hope it's just as simple as a muffler swap anyhow? Any more input?
Click to expand...

You have an exhaust leak, which means you have no back pressure. I don't know what condition your carbs/valves were in beforehand, so it's hard to comment. But we know that you have an exhaust leak that needs to be addressed. If it was a muffler with a slip-on, there's a chance it was a cheap system to begin with and was rotten internally already.
 
UncleMike said:
You have an exhaust leak, which means you have no back pressure. I don't know what condition your carbs/valves were in beforehand, so it's hard to comment. But we know that you have an exhaust leak that needs to be addressed. If it was a muffler with a slip-on, there's a chance it was a cheap system to begin with and was rotten internally already.
Click to expand...

I believe it was a Mac 4 into 1, with a slip on and a clamp used to hold it together. I just hope it's a simple muffler swap.
 
UncleMike said:
Most likely, although Macs are notorious for rusting out.
Click to expand...

Yeah man but I have a '79 GS 550, i have been looking for a flat black full exhaust but can't find anything good. All the good ones come for the later 5's or 750's. Any other good exhaust co's you can recommend? V&H?
 
VintageWWII said:
Yeah man but I have a '79 GS 550, i have been looking for a flat black full exhaust but can't find anything good. All the good ones come for the later 5's or 750's. Any other good exhaust co's you can recommend? V&H?
Click to expand...

I always go stock. I think your options are limited, but I'm sure some of the 550 guys will be around to chime in.
 
UncleMike said:
I always go stock. I think your options are limited, but I'm sure some of the 550 guys will be around to chime in.
Click to expand...

Yeah but I hate the stock look, I'm looking for something in the black department. I do have the stock exhaust, if i swap out my stock exhaust for my current one for the time being do I have to re-jet or sync anything or is it plug and play?
 
VintageWWII said:
Yeah but I hate the stock look, I'm looking for something in the black department. I do have the stock exhaust, if i swap out my stock exhaust for my current one for the time being do I have to re-jet or sync anything or is it plug and play?
Click to expand...

Is everything else stock? Have you cleaned/rebuilt your carbs? Checked your valves? Eliminated air leaks?
 
Carbs rebuilt and cleaned, valves and no leaks. Everything was fine up until this mishap.
 
UncleMike said:
No problem, but best to save the thanks until we're sure the problem is fixed!
Click to expand...

Yeah man working on it when I get home but at least I have an somewhat idea you know, I went into this with no clue but now I somewhat know what to diagnosis and fix.
 
VintageWWII said:
Yeah man working on it when I get home but at least I have an somewhat idea you know, I went into this with no clue but now I somewhat know what to diagnosis and fix.
Click to expand...

These bikes are easy. We'll get you running right, promise.

Do you have new gaskets for the exhaust? We don't want to introduce new leaks!

Usually best to get everything installed on the bike before tightening any bolts, btw. Easier that way.
 
UncleMike said:
These bikes are easy. We'll get you running right, promise.

Do you have new gaskets for the exhaust? We don't want to introduce new leaks!

Usually best to get everything installed on the bike before tightening any bolts, btw. Easier that way.
Click to expand...

Yeah I already had someone pick up a gasket for me, that was my first thing to do, get new everything, gaskets, bolts, clamps. Yeah, thanks alot man!!!
 
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