Question about 1977 Honda GL 1000 (K2)

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Exhaust system I want to get some good sound out of my GL1000 exhaust. I know if I run straight pipes I'll lose some performance but don't know how much. Could I minimize the loss by running cherrybombs or is there a better solution?

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I have the muffler pipes from a Harley Sportster on my 76 gl1000 and they sound great with no need to change the adjustments.

Posted on Jan 22, 2009

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You can run straight pipes, but you'll need to re-jet your carbs.

Posted on Nov 21, 2008

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Truck has a fluttering noise at exhaust pipe


Ron, A lot of cars and trucks experience this,Is your engine running good and tuned up, if you find no exhaust leak(including around the manifolds) and know baffles in mufflers are OK and not loose, you may have to consider it normal. I have not done it, some say to install an H or X pipe ahead of mufflers to equalize exhaust pressure and get rid of noise. Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
http://www.fullsizechevy.com/forum/general-discussion/performance/exhaust/467084-fluttering-flapping-noise-out-exhaust.html
How After Market Exhaust Systems Can Disrupt Your Car Power Curve Exhaust...
http://www.camaro5.com/forums/showthread.php?t=269259

Jul 08, 2016 | Cars & Trucks

1 Answer

What modified exhaust system is best


exhaust systems are more complex than just sticking on any old thing
exhaust systems that are "mandrel bent) have a smoother flow of exhaust gas
systems that have a balance pipe between banks is a must but the balance pipe has to be of a particular size
to understand an exhaust system you have to have some understanding of how it works
yes--- it takes the exhaust gas out the back and sounds real good when it is loud and if that is all you want then any system will do the job
the fact is , exhaust systems when operating correctly are designed to move the gas at such a speed so as to have the low pressure shock wave return to the exhaust valve at the moment when it is opening and so the compression gas exits into a low pressure are
this low pressure shock wave is created when the high pressure of the expanding gas in the exhaust reaches the end of the pipe and explodes into the air.This creates a low pressure in the pipe behind it which then travels back up the system to get to the exhaust valve at the precise moment it opens
Now if the system is too long, too big or has too many bends or wrinkles in the bends, that movement of the low pressure is lost to the exhaust valve and so the gas escapes into a pressure area
in effect exhaust gas flows as a pulse as each exhaust valve is opened in succession
this pulse is what is heard as a loud noise from a bad system
it indicates a system that is not getting fully performance from the engine
another point --- exhaust gas noise echoes in a pipe as like ripples from a stone dropped in water
to have an efficient exhaust system that is quite , that principle has to be acknowledged and the system muffler silences that echo without affecting the gas flow
that is why a muffler works as it shuts down the echo out the pipe but it also blocks the gas flow
items fitted such as "hot dog " type mufflers absorb and the way such a muffler is fitted depends on the amount of echo captured the echo with out affecting the gas flow
so now having some understanding of the purpose of an exhaust system , you should be able to select a performance enhancing system with out the noise problem that will attract the law enforcement agencies
the cost is no guarantee of performance but design suited to the car is

Sep 08, 2015 | Cars & Trucks

1 Answer

Ihave a 1979 1000cc sporty with a as supper e shorty carb that was revolt last winter it was running fine till last month it's been back fireing from the exhaust pipes and air filter the plugs are good...


Backfiring out of the exhaust pipes usually indicates an ignition problem. What happens is that the fuel air mixture in the cylinder is not burned and is exhausted into the exhaust pipes. The next time the cylinder fires and the exhaust valves open and allows the residual flame to exhaust into the pipe, it ignites the unburned fuel in the pipe from the previous misfire. What kind of igniton system is on the bike. And, spark plugs will foul within minutes in an Ironhead Sporty if the mixture is too rich. Your super "E" is still a quite large carburetor for that engine. It should have a #26.5 slow jet and a #66 main jet. Make sure that your accelerator pump is not adjusted to put too much fuel in the cylinder when you open the throttle. Go to S&S's tech site and download files 51-1012 and 51-1013. This will tell you everything you need to know about your carb. http://www.sscycle.com/instructions/instructionslist.php?x_cat=24 If you are running open drag pipes on your Ironhead, you don't have enough backpressure on the exhaust system and you've probably got a flat spot at about 55-60 mph. If so, look on the backside of the exit end of the pipes. There may be a hole in the pipe for the bolt to hold the baffles in the pipe. If this hole is open, install a 1/4" bolt that is 1 1/4" long in the pipe with three nuts on the bolt on the inside of the pipe. Put one of these bolts in each pipe. This will give you just enough backpressure to almost eliminate the flat spot and the bike will perform much better. Due to the hemispherical design of the heads, the Ironhead must have some backpressure. I hope this helps.

Good Luck and Ride Safe
Steve

Sep 11, 2011 | 1979 Harley Davidson XLS 1000

1 Answer

I have a 2000 HD Roadking with a stock exhaust. How can I make the stock exhaust louder


The age-old Harley stigma:Louder is better.
We all love the Harley sound but to get loud you may sacrifice performance. There are numerous after-market pipes that will improve performance and change sound but you cannot really do both. Drag pipes are the loudest but would be lousy looking on your Roadking and you lose mid-range response. Pipes have to be tuned and it is an exacting science.
Best bet is to go to J&P Cycles website and look at all the pipes. Call their tech support and ask what they recommend.
Here is an excellent web site

http://www.nightrider.com/biketech/exhaust.htm

Jul 13, 2011 | 2000 Harley Davidson FLHR-FLHRI Road king

2 Answers

Water is getting out of the exhaust


Of course, I don't know the entire situation of your exhaust, but I doubt what you are seeing is water. The exhaust pipe carries out ignited gas fumes that your engine has ignited. Any unignited gas will escape through the exhaust pipe if it is not used properly. If large amount are coming out of you exhaust pipe, you are loosing a lot of money on gas. My best guess would be bad spark plugs not igniting the gas properly. I would try replacing those first. If you are not good with cars, I recommend taking the car to a certified professional mechanic. I hope this helps! Please feel free to ask any questions if needed.

Apr 25, 2011 | Mitsubishi Colt Cars & Trucks

1 Answer

Why does the muffler make a popping sound it ...


This is what's called an oxymoron. Because with straight pipes there is no muffler! Haha. Sorta like Jumbo Shrimp.
But the cause of your popping sound is because of afterburn in the exhaust system. With no back pressure because of the straight pipes, some of your engines' combustion is happening in the exhaust. That is a super way to burn a valve BTW.

May 21, 2010 | Motorcycles

1 Answer

How to take baffles out of standard exhaust?


Inadvisable. The stock exhaust system and the engine jetting / calibration are balanced for the best"compromise" performance. Removing the baffles will change the exhaust pressures and upset things. It may sound more powerful because it will generate more noise but that's all. If you want a better sound AND better performance change the complete exhaust system and have the induction system matched to the new pipes.

Mar 23, 2010 | 2007 kawasaki ZRX 1200 R

1 Answer

My motorcycle came with Cobra pipes and these are


Im not very familiar with your specific bike, but I do know what your problem is.cobra pipes are usually a straight-through design, meaning they have no muffler. the ones that do have a muffler usually have a very small one. smaller mufflers mean less fiberglass packing inside to absorb all of that noise. if your not too concerned about performance, then your best bet would be to go back to a factory exhaust. thats going to be the quietest one that you can use. Im sure there are also aftermarket systems available that also use a good muffler for noise control, but pretty much any aftermarket pipe is going to be louder then the factory setup. they are designed to give your engine more performance, which means less restriction for the xhaust gasses, which also means more noise due to the more open design of the pipes. Im not sure if your bike comes carbureted or fuel injected, but keep in ind that any exhaust changes made to a carbureted engine will require carburetor jetting adjustments to compensate for the change in exhaust flow. now, if you decide that your willing to lose just a tiny bit of performance for a quieter ride, then you may be able to find a used stock system on ebay for a very reasonable price. or if you want to stay aftermarket, then most companies test the sound levels of their exhaust pipes. by contacting the manufacturers, you should be able to obtain and compare the sound decible levels for different exhaust companies to find one that meets your needs.

Jul 28, 2009 | 2002 Yamaha Road Star

1 Answer

Not running well at medium to high rpm


you say that it was running well was this before or after the installation of the pipes and rejetting I doubt that the problem is electrical more likely it is sucking air some where in the exhaust system check that the manifolds are firmly secured & that the the clamps secureing the mufflers to the pipes are also firmly secured finaly check that the jets have not worked themselves lose this can sometime happen if they were not tightened well at installation

May 05, 2009 | 2003 Yamaha V Star Classic

1 Answer

Is$175.00 for one flowmaster super 44 series muffler too much?


Heres the bottom line...My dad used to tell me that nothing is worth more than you are wiling to pay for it.
What you now have is a mix of unmatched components that sound nice, and possibly may give you a one or two mpg increase. However, a good exhaust system is carefully engineered to take advantage of sonic as well as physical, laws that influence the way both sound and air (exhaust) behave in certain diameter pipes, when traveling at pre-determined speeds.
Most stock exhaust is far from that, rather, it is the cheapest easiest means to permit exhaust to escape from the engine while making the least amount of noise, while keeping the converter operating. Therefore anything you do to lower pressure will give you somewhat of a performance gain. In using a part of the stock system, you cancel some of that gain by creating another restriction. I'd be satisfied with what you have but would be concerned about passing a state inspection. If you want to learn more about exhaust and how it influences your engine there are many good books you can read on this subject. (I know that because I probably read them all as a pro racer).
Good luck with your Jeep!!!

Apr 04, 2009 | 1995 Jeep Grand Cherokee

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