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Rejetting for straight pipes?

  • Thread starter Thread starter bohisboh
  • Start date Start date
B

bohisboh

Guest
So I have a recently acquired 1983 GS650GL, which happens to have straight pipes on it. Everything else non-cosmetic is stock to my knowledge. Anyway, it starts to sputter at about 60mph. My question is what size jet would be optimal for this model and exhaust setup?

Thank you,
Boh
 
bohisboh said:
You're saying going back to stock pipes would be best?
Click to expand...

Definitely

No rejetting, or jet kit. No endless fiddling around with the carbs. Your neighbors don't hate you

You'll lose 2 hp and gain 8-10 mph

What could be better?
 
bohisboh said:
You're saying going back to stock pipes would be best?
Click to expand...

Stock is always best. The problem is finding them. Aftermarket is an option but that might involve jetting also however a slighter jump in carburetion.

Do a search, plenty of members here to help. I run stock whenever possible.
 
Straight pipes are for losers. Be responsible and caring, install mufflers. Harley castoffs are readily available and cheap. Places like JC Whitney sell Dunstall replica mufflers that are reputed to have a throaty sound but not obnoxious.
 
Big T said:
Definitely

No rejetting, or jet kit. No endless fiddling around with the carbs. Your neighbors don't hate you

You'll lose 2 hp and gain 8-10 mph

What could be better?
Click to expand...

I hear you. That would be a lot less headache. From that point what would be the best route to imitate the current raw sound? Also it's matte black so I'd also just repaint? Or do any come in black. Thanks and pardon all the questions I'm new to this stuff.
 
Nessism said:
Straight pipes are for losers. Be responsible and caring, install mufflers. Harley castoffs are readily available and cheap. Places like JC Whitney sell Dunstall replica mufflers that are reputed to have a throaty sound but not obnoxious.
Click to expand...

Right on! Thanks answered my other questions.
 
Dennis Kirk has good prices also with free ship.

Black available depending on style.
 
Since you've just recently acquired this bike you may want to consider doing some basic maintenance on it. Some of your issues may be simply resolved by doing that.

Once you've replaced the stupid straight pipes then consider doing a complete valve adjustment and then a complete strip and dip of your carbs.
 
Yeah absolutely some of that has been done i.e. oil change, brake fluid etc. That's down the road but is definitely something I'd like to have done, first being able to ride down the road decently :p
 
bohisboh said:
Yeah absolutely some of that has been done i.e. oil change, brake fluid etc. That's down the road but is definitely something I'd like to have done, first being able to ride down the road decently :p
Click to expand...

You'll find that properly cleaning the carbs, making sure there are no intake/exhaust leaks, and doing a valve adjustment are prerequisites to rejetting because they effect the jetting. In fact, doing those basic maintenance items might clear up your problem and you might not have to rejet. Then you can decide whether to replace the straight pipes or put on some sort of muffler and jet appropriately.
 
dantodd said:
You'll find that properly cleaning the carbs, making sure there are no intake/exhaust leaks, and doing a valve adjustment are prerequisites to rejetting because they effect the jetting. In fact, doing those basic maintenance items might clear up your problem and you might not have to rejet. Then you can decide whether to replace the straight pipes or put on some sort of muffler and jet appropriately.
Click to expand...
Makes perfect sense to me. Is there any black exhaust systems you would recommend that would fit this make/model whilst still achieving a throaty sound? I've been attempting to dig but don't know the first thing.
 
bohisboh said:
Makes perfect sense to me. Is there any black exhaust systems you would recommend that would fit this make/model whilst still achieving a throaty sound? I've been attempting to dig but don't know the first thing.
Click to expand...

I'm still new here too so I done have a ton of experience across the GS line. I'm trying to figure out what to do with my exhaust. But if straight slip on will fit is try the harley mufflers. They're plentiful and cheap, I sometimes see them on Craigslist for $50 for q pair. (on my bike the header ends underneath and I need mid pipes or bent muffler)
 
bohisboh said:
You're saying going back to stock pipes would be best?
Click to expand...

I wouldn't say best, but almost certainly they would be better than untuned straight pipes. Defining what you mean by 'best' would help some. If you want smooth running with minimal noise and moderate power then stock is likely best. If you want more power and want or don't mind a louder exhaust then an aftermarket pipe will be best.


Big T said:
Definitely
Click to expand...

Runeight said:
Stock is always best.
Click to expand...

Nonsense. Aftermarket pipes are just fine and will work just as well as stock if done properly.


bohisboh said:
Makes perfect sense to me. Is there any black exhaust systems you would recommend that would fit this make/model whilst still achieving a throaty sound? I've been attempting to dig but don't know the first thing.
Click to expand...

As noted, take off H-D mufflers are all over the place for cheap and would be a good first try. If you don't like the chrome some sandpaper and header paint can make them black in an afternoon. I doubt you are going to get anything that sounds throaty, the engine is small at 650cc and just doesn't have the displacement to sound very big and deep.


Mark
 
"Throaty" is different on a smaller cc bike. I would describe my exhaust as such at lower rpm. To get to that sound, you are going to let a lot of noise out on hard acceleration. I'm using a 4-1 with megaphone muffler. I had mine powdercoated (ceramic) instead of painted. Header wrap helped accent the rumble and tame a bit of the sound volume.
 
mmattockx said:
I doubt you are going to get anything that sounds throaty, the engine is small at 650cc and just doesn't have the displacement to sound very big and deep.


Mark
Click to expand...

You should hear my 550/675. Throaty it has, at least when it isn't at 10,000 RPM.
 
GSCafe said:
"Throaty" is different on a smaller cc bike. I would describe my exhaust as such at lower rpm. To get to that sound, you are going to let a lot of noise out on hard acceleration. I'm using a 4-1 with megaphone muffler. I had mine powdercoated (ceramic) instead of painted. Header wrap helped accent the rumble and tame a bit of the sound volume.
Click to expand...

What specific system did you get, if you don't mind me asking?
 
mmattockx said:
I wouldn't say best, but almost certainly they would be better than untuned straight pipes. Defining what you mean by 'best' would help some.
Click to expand...
By best I mean optimally rideable including freeway speeds. And I wouldn't mind a little more 'oomph' and some noise, while not being obnoxious.
 
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