Author Topic: Making a baffle - Part 2 - Sound Clip Inside (Read 8527 times)

Johnny5 · « **on:** May 29, 2009, 02:38:18 PM »

Well, I was successful in making a baffle/mini muffler for the 750K7. The bike sounds awesome. I'll post a picture of what I did and a sound clip as soon as my computer is back from being repaired.

One question on jetting:

Im running pods and the exhaust is a Mac 4-1. Bike ran perfect in all throttle ranges before opening up the baffle ( light tan plugs) and now the exhaust is flowing a lot more than before, and my WOT position has seemed to weakened. Good power from start to about 3/4, then no power. Im thinking now I may need to put a larger main in. Havent done a plug chop yet, but does more exhaust flow require a larger main?

Alan F. · « **Reply #1 on:** May 29, 2009, 03:54:27 PM »

I was wondering how that worked out for ya...

Johnny5 · « **Reply #2 on:** May 29, 2009, 05:01:46 PM »

I have a great sound and not too loud either. Definitely louder, but 4 times deeper. I just ordered a few different main jets. Im sure a size up or two will work fine.

moham · « **Reply #3 on:** May 29, 2009, 06:43:26 PM »

Fotos.

Alan F. · « **Reply #4 on:** May 29, 2009, 07:06:40 PM »

Cant' wait to see what you made and how you made it, what pipe are you using by the way?

Johnny5 · « **Reply #5 on:** May 29, 2009, 07:22:46 PM »

I'll have pics and a video clip as soon as my computer is back.

It's a mac header.

Alan F. · « **Reply #6 on:** May 29, 2009, 07:29:56 PM »

Oh no, you didn't buy it from Best Buy did you? Their service sucks and they'll try to tell you your machine is virused up just to get more money out of you...
they suck!

You got a Mac header to sound good? You're the King!

Johnny5 · « **Reply #7 on:** May 29, 2009, 07:41:52 PM »

Quote from: Alan F. on May 29, 2009, 07:29:56 PM

Oh no, you didn't buy it from Best Buy did you? Their service sucks and they'll try to tell you your machine is virused up just to get more money out of you...
they suck!

You got a Mac header to sound good? You're the King!

Nah, my HP is having a video problem and it's covered under warranty. I sent it to them on the 26th and they sent it back out today. That's some decent service.

Im really surprised how nice the bike sounds. I had no idea what it was going to sound like with my baffle system. You guys are gonna poop a brick when you see it.

KB02 · « **Reply #8 on:** May 31, 2009, 04:17:56 AM »

Quote from: Alan F. on May 29, 2009, 07:29:56 PM

You got a Mac header to sound good? You're the King!

I'm anxious to hear the sound of it. I never liked the MAC exhausts; mostly because of that tinny, buzzing sound they have. I had one on an old nighthawk 750 (83). I pulled the baffle out of it once just to see if I could fix it or something. Had I known then what I know know, I would have done just what you're doing. There is only room for improvement.

moham · « **Reply #9 on:** May 31, 2009, 08:14:35 AM »

Word. I've pulled my Mac baffle and drilled more holes in it, wrapped some Fiberglas aroun it, drilled more holes, pulled out the glas and still no bueno...only thing I haven't done is the stainless scrubbies, but I am interested to see/hear this.

Johnny5 · « **Reply #10 on:** May 31, 2009, 05:25:49 PM »

Yeah, I didnt use the Mac muffler at all and made my own mini muffler out of an exhaust tip. I didnt want to screw with the Mac muffler, afraid I'd make it worse. So I built one from scratch.

I'll post pictures and a video clip this week. Promise.

Johnny5 · « **Reply #11 on:** June 03, 2009, 07:09:38 PM »

Here's the baffle.

Started with this (inside of the exhaust tip (mini muffler):

Found this exhaust pipe connector and cut it down to fit inside the muffler and so the muffler will fit snug over the exhaust pipe.

Like this:

Baffle time. I used a headlight ear from a 1972 CB350. Drilled random holes in it. The more holes, the quieter the muffler will be. I jb welded a soup can bottom to the end of it. This will keep the packing inside the muffler.

To secure the baffle to the inside of the muffler, I used self tapping screws through the end of the muffler and into the soup can part. I packed the outside of the baffle with steel wool and used another soup can bottom to seal up the other end of the baffle.

I'll post a video clip of the bike running as soon as my computer is up and running. So far, I've got nothing but compliments on the sound.

Johnny5 · « **Reply #12 on:** June 03, 2009, 07:11:17 PM »

Oh and an update on the bike's jetting. It's fine, I was trying to go WOT in too high of a gear.

Alan F. · « **Reply #13 on:** June 04, 2009, 06:59:48 AM »

Quote from: Johnny5 on June 03, 2009, 07:11:17 PM

Oh and an update on the bike's jetting. It's fine, I was trying to go WOT in too high of a gear.

I saw the pic of the baffle end and thought, "wow I wonder what he made that out of?" Then I read down and thought, "holy crap that's a good trick!"
it might not last through the second season, but who knows? Maybe heat it up and spray some VHT paint inside and out to seal the surface of all that thin steel?

Very cool, can't wait to hear it.

Johnny5 · « **Reply #14 on:** June 04, 2009, 07:31:16 AM »

Quote from: Alan F. on June 04, 2009, 06:59:48 AM

Quote from: Johnny5 on June 03, 2009, 07:11:17 PM
Oh and an update on the bike's jetting. It's fine, I was trying to go WOT in too high of a gear.

I saw the pic of the baffle end and thought, "wow I wonder what he made that out of?" Then I read down and thought, "holy crap that's a good trick!"
it might not last through the second season, but who knows? Maybe heat it up and spray some VHT paint inside and out to seal the surface of all that thin steel?

Very cool, can't wait to hear it.

Thanks and yeah, who knows how long it'll last. Cool thing is there's not much to it and can build something heavier duty later on.

Philly550K1 · « **Reply #15 on:** June 04, 2009, 10:27:16 AM »

fun, isn't it? do you have a pic of the whole thing installed?

Johnny5 · « **Reply #16 on:** June 04, 2009, 10:46:07 AM »

Fun stuff, indeed.

Here's some shots:

Philly550K1 · « **Reply #17 on:** June 04, 2009, 12:29:03 PM »

dig. yeah, i've admired that tip and similar ones in the toy store. if it were me, i wouldn't trust the clamp enough. i'd want a screw or bolt-and-nut thru the collector and the tip. a discreet one on the left/inboard side... of course, my current design incorporates a shower drain and a wingnut, so, caveat erector....

Johnny5 · « **Reply #18 on:** June 04, 2009, 12:38:52 PM »

As far as holding the muffler to the exhaust pipe, the clamp works really well. It's on there tight!

The baffle is screwed in and secured from the outside, but I was able to access the part of the muffler through the back. In the first picture looking into the pipe, you can see what is actually welded to the muffler on the inside. I secured the soup can part of the baffle to this. It's not goin' anywhere.

Sporkfly · « **Reply #19 on:** June 04, 2009, 06:45:57 PM »

Sound clips man!

(I suppose you could say the same to me though

)

Johnny5 · « **Reply #20 on:** June 05, 2009, 04:38:36 AM »

Got my computer back, but Im waiting to get my backup data from my friend to load the computer back up. I'll get the clip posted this weekend. Promise.

Alan F. · « **Reply #21 on:** June 10, 2009, 06:34:16 AM »

Sound clips?

Johnny5 · « **Reply #22 on:** June 10, 2009, 06:37:48 AM »

Okay, okay, okay, tonight, I promise again!

Johnny5 · « **Reply #23 on:** June 10, 2009, 08:12:17 PM »

Geesh, that upload took forever. My son the camera man.

Here you go.

kpier883 · « **Reply #24 on:** June 10, 2009, 08:27:37 PM »

Looks and sounds good!

Johnny5 · « **Reply #25 on:** June 11, 2009, 04:39:10 AM »

Thanks

Alan F. · « **Reply #26 on:** June 11, 2009, 06:13:47 AM »

That's awesome J5! I don't know how bad it was with the mac can on there, but it really sounds nice now. taking into account the looks of your bike, I can understand your quest for the right sound. How's it sound out on the road going through the gears and decelerating? And lastly the store you bought that tip from only has locations in 3 or 4 states... were there any markings on it showing the manufacturer maybe? I might be inclined to try making one myself.

Johnny5 · « **Reply #27 on:** June 11, 2009, 06:21:24 AM »

Sounds even better through the gears.

Alan F. · « **Reply #28 on:** June 11, 2009, 06:48:37 AM »

Then you've built the real deal, looks as good as it sounds!

freezingprocess · « **Reply #29 on:** June 24, 2009, 02:23:45 PM »

-Just found this thread, and you've inspired me to make my own muffler. I also have a Mac on my 550 and I hate the way it sounds; especially around 4000 rpm- sounds like it's coughing up a lung. It's the only thing on my bike that I don't like. Good job on yours man; it sounds really good. Hopefully whatever I come up with will make my 550 sound as good as your 750.

Alan F. · « **Reply #30 on:** June 24, 2009, 03:56:34 PM »

Quote from: freezingprocess on June 24, 2009, 02:23:45 PM

Hopefully whatever I come up with will make my 550 sound as good as your 750.

pennyracer · « **Reply #31 on:** August 12, 2009, 08:45:10 PM »

i tried IMing you but i guess since im new i cant. so anyway, im in the same boat as you, cb750 and i made/am still making a muffler from scratch and have the individual pod filters. i was wondering what size main jets did you go with and did you alter the pilot jets?

Johnny5 · « **Reply #32 on:** August 13, 2009, 08:25:47 PM »

Hey Penny,

Sorry Im late with this reply. Havent been on a computer for a while.

Right now Im using a 130 main. It's a hair rich, which I'd rather have than lean. My plugs are dark tan. I have some 125 mains on order just to see the difference.

Needle raised to 4.5 spots (i used a shim to get it there).

Stock pilot jet, set 2 turns out.

pennyracer · « **Reply #33 on:** August 14, 2009, 12:24:45 AM »

thanks for getting back to me. ill probably use your carb set up for a starting point and see where it leads me. hopefully it will be right on the money if im lucky. after tons of reading ive seen any where from a 120 to a 138.5. so 130 seems like a good place to start.

thanks again

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Author Topic: Making a baffle - Part 2 - Sound Clip Inside (Read 8527 times)

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