Mufflers

I'm back on this subject of muffle replacement. Because I'm a tight wad I don't want to spend alot. But what can I get by with without having to make engine mods?

I'm even sure where I should make the attachment point from the new muffler to the rest of the assembly. This means I need to cut the pipe at the weld, correct? What size would that be?

Now the muffler choice. I want something cheap, unique, quiet and work.
We have a tractor supply place in town and I was looking at tractor mufflers. They quite unique, rugged and real cheap. I don't need chrome. Anyway the muffler is staiht through but has baffles bent in from the side to the center. They look like I could make them work but would I need to make mods to motor or will this create enough back pressure?

I also have looked at the straight pipe with the baffle insert and was wondering how loud those pipes are. Does any one know?

I need guidence here folks, help a muffler moron increase his knowledge by passing some yours on.

Thanx
the buff

 

I'm trying to imagine what a Bike would look like with a Tractor Muffler welded-up and bracketed to make the engine run quiet.

I can't be of any help in this department.

Only one thing comes to mind when I try to envision how this is going to look.

A synthesized computer voice says in a gentle yet matter-of-fact tone.

"I'm sorry Dave. I can't do that."

I'd look for something off eBay before I started going down that road.

 

So do the people who design and build motorcycles for a living.

Tractors aren't exactly the quietest vehicles out there. Having driven a few myself, I can vouch for this.

My answer to your question would be... I don't have an answer. Someone more fluent with exhaust design would have to jump in here.

 

Go to:-

http://www.jcwhitney.com/autoparts/Prod ... 58/c-10111


They are cheap , easy to fit to the collector box and the chrome looks very good. They sound nice with or without the baffles and are not too loud.

I have the megaphone ones ($49 each) fitted to my X and did not have to mess about with the carb jetting. Well worth the money IMHO.

 

I have a pair of the Megaphone mufflers JCW item #ZX017556T, brand new in the box. I bought them because they were advertised as being original 700 mufflers, which they weren't (obviously!) when I received them, and the seller refused to take them back.

I'll take $79 for the PAIR of them, plus shipping, that's over $40 less than what JC Whiteny offers them for on sale:

http://www.jcwhitney.com/autoparts/Item ... 0000142712

 

Tractor mufflers would be an excellent choice. I'll have to keep that in mind for future projects! Good idea!!!

 

I picked up some cheap screaming eagles from ebay, put them on and they worked perfect.

 

I tried a pir of Screamin' Eagles on mine and thought they were a little too loud for taking off at 5 A.M. and not waking the neighbors. Other than that, they do have a nice sound to them. They are brand new and only used for an hour. I'll take $50 plu shipping if anyone is interested. >PD<

 

Next step: paint the bike green and slap a John Deere logo on the side.

 

If you can somehow rig it to pick-up, mulch and bag leafs ... I'll buy it!

 

Everybody is a comedian. Seriously the tractor mufflers are quite quiet and being in the middle of the bread basket, they are easily obtained and cheap. Real mufflers would be better.

The Sreaming Eagles would be cool but the loud part is what I don't want. My decision is also dictated by the fact that I just put ammo boxes on the bike for cases and right now the exhaust is directed at the bottoms. I did see that someone on this site did the same thing but made end pieces for the muffler tips to redirect the flow, great idea.

I'll think on this a few more days and make a decision.

Thanks for all the ideas and thoughts.

Rick, I'm working on the mulcher/bagger thing. I'll keep you abreast of the R & D work here at Yamaha Agricultural Division.

A new 24 row combine is also in the engineering stages and when it goes to production will operate pure corn ethonol.
The Buff

 

I've been looking and looking for these mufflers too. Nothing as of yet. I'm not a huge fan of the megaphone style either. There have been a bunch of questions about all of this and the use of pods. I'm working on making baffles for some straight pipes. The trick to all of this would be getting enough restriction on there to not change the jetting. I have owned a couple of bikes now, and modded my fair share. Jetting changes are so tough to get right. I'd like to make these baffles for the carbs as well, so that the stock airbox can be stripped out. I'm trying to come up with something scientific to chase down how much back pressure a stock muffler produces and then replicate the results. Nothing yet though. I do like the sound of stock, just not the look.

 

You could make a tap in the side of the exhaust, and hook up pressure gauge that reads in inches of water. That would give you the back pressure. I use to work at Texaco Research and this is what we used to check and regulate the back pressure, using a valve in the echaust to regulate it. We didn't run the mufflers on these but simulated the back pressure.

 

Hastings tools makes an Exhaust Pressure Guage that isn't much money. Not very popular, but any partsperson should be able to find it.

 

I think with bikes that still have a stock collector box ... the back pressure is from the collector and not the silencers.

My winter project is going to be taking the Collector Box off and "Quilting" a new top side of sheet metal on it.

Last time I did the oil and looked at the top of the Collector, it was looking pretty thin up, in between there. I hope there's enough to take a weld, here and there, because I want to save this one instead of trying to fine another one that might just be as bad or worse.

Winter started today!
We had the first Snow!

 

so what you're saying there Rick, is that if I keep the stock collector box, I SHOULD be able to change the mufflers without any jetting dramas?

 

"Most" of the back-pressure is developed right at the Collector.
The Silencers deal with the exhaust AFTER it clears the Collector!

 

wehn (if) I get the beast on the road, I might dump the mufflers and take it for a ride to see how it goes...