Removed Mufflers - - Results - Page 2 - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Engine / Exhaust / Cooling
\ From the radiator, through the case and out
the exhaust. If it has to do with the cooling,
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post #11 of 27 (permalink) Old 05-03-2018, 05:10 PM
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POP POP POP POP POP POP

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post #12 of 27 (permalink) Old 05-03-2018, 11:50 PM
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How are the stock mufflers restrictive? They are straight through and good diameter, there are no baffles!

1989 VN750
Highway blaster

2006 Honda Rebel Diesel
100mpg, low and slow

1982 Mercedes 300D
Modified engine, 4-speed manual
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post #13 of 27 (permalink) Old 05-04-2018, 11:05 AM Thread Starter
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The stock mufflers have a single baffle on them. I can't say how restrictive they are, but they do have a baffle.


'89 VN750 Bought stock 4/12/18 @ 17805.9 miles $800. Wrecked once. 27454.5+ miles

Completed modifications:
Removed mufflers, straight pipes out of GB. 110/90 Front Tire. Pick-up coil mod. Shindengen MOSFET FH020AA r/r. USB Outlet + Voltmeter. Repainted Metallic Blue w/ new tank bages. Ear Shave (wo/ coasters) 40/140 NO shims 45MPG. MCCT conversion.

Planned modifications:
Custom LED turn signals. Windshield. Highway Pegs. (Possible) ignition adv. Tuxedo Mod. Ignition coil mod.
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post #14 of 27 (permalink) Old 05-10-2018, 04:41 PM Thread Starter
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Here are pictures with the muffler's removed.
Sorry for the delay, my phone stopped being able to log in!
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'89 VN750 Bought stock 4/12/18 @ 17805.9 miles $800. Wrecked once. 27454.5+ miles

Completed modifications:
Removed mufflers, straight pipes out of GB. 110/90 Front Tire. Pick-up coil mod. Shindengen MOSFET FH020AA r/r. USB Outlet + Voltmeter. Repainted Metallic Blue w/ new tank bages. Ear Shave (wo/ coasters) 40/140 NO shims 45MPG. MCCT conversion.

Planned modifications:
Custom LED turn signals. Windshield. Highway Pegs. (Possible) ignition adv. Tuxedo Mod. Ignition coil mod.
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post #15 of 27 (permalink) Old 05-10-2018, 05:11 PM
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Looks like shorty megaphones.

I fired mine up like that one time, I thought it sounded like an atv, thump-thump-thump. Didn't ride it though.

Watch the plug color to see if it goes lean.

I see pairs of HD mufflers pretty often. $10-20 plus shipping.

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
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post #16 of 27 (permalink) Old 05-11-2018, 12:13 AM
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looks surprisingly clean with the heat shields installed. I'm curious to hear how it sounds, might have to give it a try sometime!

Earshave+Rejet (38/135) NGK Iridiums MCCT Conversion Slipstreamer S03 Windshield Custom Extended Backrest Custom Highway Bars MOSFET R/R LED Underglow Volt+USB In-Dash Two-Wire & Blue-Wire Mod Satin Black Engine Paint Dampers Parts - Jets: Main=99101-393(#132 stock)/Pilot=n424-22 Pilot(#38 stock)
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post #17 of 27 (permalink) Old 05-13-2018, 12:43 PM
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Cool

Quote:
Originally Posted by Jason Pittenger View Post
Here are pictures with the muffler's removed.
Sorry for the delay, my phone stopped being able to log in!
....your passenger's shoe soles will melt !

She'll refuse to ride with ya.....might as well put a solo seat on the beast.

WilliamTech3
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Originally WilliamTech
Since May 2011
86 VN750 13,700 mi -Stock -Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
Jardine Fwd Controls, Custom Fenders w/Rails
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery, Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !

...have a Vulcan good day !
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post #18 of 27 (permalink) Old 05-29-2018, 11:12 AM Thread Starter
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So a few weeks of riding without mufflers, I have an updated review.

It sounds really good below 3.5k! At about 4k, the individual pops start blending together. As a result, I've found myself lugging the engine if I shift by sound. I have to force myself to keep RPMs above 3k. Because of its HD resembling sound, it's a bit odd to wind it out to 8.5k. With Harley's falling flat at 5500, it sounds like I'm over revving the engine! It definitely sounds bigger than it is. It's sound matches its performance now.

At cruise, the engine noise is audible above wind noise (I wear a full face helmet), but not objectionable. It's no more fatiguing than the wind noise is. For rides over 30 minutes, I prefer to have ear plugs, but that was true with the mufflers on. At 60 mph, the engine's so lightly loaded that there's not a huge amount of noise. At 80 mph, you can hear the engine pushing. It increases in volume about as much as the wind noise increases from 60 to 80. I feel more in tune with what the engine's doing, simply by being able to hear it at cruise.

Pulling the mufflers means the heat shields lose one of their mounting points. Make sure the other two clamps are tight. There's not a lot of clearance between them and the passenger foot peg mounts and that's where they shake and rattle the most! I ended up shifting the shields a bit to gain clearance, as well as gently & slightly bending them away from the mounts.

Quote:
Originally Posted by WilliamTech3 View Post
....your passenger's shoe soles will melt !

She'll refuse to ride with ya.....might as well put a solo seat on the beast.

WilliamTech3
For better or worse, she already has no desire to ride with me. Her loss!
I like the Mean Streak seat...I might put one on.


'89 VN750 Bought stock 4/12/18 @ 17805.9 miles $800. Wrecked once. 27454.5+ miles

Completed modifications:
Removed mufflers, straight pipes out of GB. 110/90 Front Tire. Pick-up coil mod. Shindengen MOSFET FH020AA r/r. USB Outlet + Voltmeter. Repainted Metallic Blue w/ new tank bages. Ear Shave (wo/ coasters) 40/140 NO shims 45MPG. MCCT conversion.

Planned modifications:
Custom LED turn signals. Windshield. Highway Pegs. (Possible) ignition adv. Tuxedo Mod. Ignition coil mod.
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post #19 of 27 (permalink) Old 05-29-2018, 11:44 AM
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I love the sound of these motors with opened up exhaust at higher rpms

Sent from my Z899VL using Tapatalk

ONE RATS ASS GIVEN PER POST
Support your local FREEBIRDS MC
1986/5 Vn700/750 Frankenfook cross eyed bitch "Mellisa Fayhe"
I am a BIKER and i'm proud.FREEBIRDS MC CENTRAL NY

lowered with progessive 412 10" shocks
rejetted for K/N Pods part#rc 2340
sportster seat

'I didn't lose my mind.i gave it away

BRING BACK WOLFIE."Peace and Carrots"RIP
"And I'm free...as a bird"John Lennon Free as a Bird
"I only carry when I have my pants on"Joe Robinson RIP aka Old Dog
OleDirtyDoc is online now  
post #20 of 27 (permalink) Old 06-25-2018, 05:42 PM Thread Starter
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Yesterday, I was told from a non-biker that my bike doesn't sound like an HD, but sounds Japanese. I pressed for more explanation, and he said "it's missing some low end, and you don't sound like a complete #*@-hole".

On the topic of not being an #*@-hole, for morning rides, I start my bike in the garage (doors closed, while I stand outside) and let it warm up, before I leave. My driveway slopes down into the garage, so I either have to wait until I don't need choke, or I have to wind out to 3k rpm. I keep acceleration at a minimum until I'm out of the neighborhood. I don't want my neighbors to hate me.


I have noticed I don't get deceleration pops after full throttle runs. However, I do get them coming off of cruise. Could I be a bit lean on the main jet?


Some have discussed how removing back-pressure might cause a loss of torque. To be more concise, it is the tuning of pressure waves that result in added (or lost) torque. The expansion of the pipe causes a negative pressure wave to travel back to the cylinder. This negative pressure causes scavenging of exhaust gasses, resulting in more efficient burning (and more torque). I looked at the stock mufflers, and the pipe size expands right before the baffle, and right at the point that my pipes now end. So the pulse timing should be almost identical to factory tuning, and thus there shouldn't be any torque loss. I cannot confirm this with dyno runs, however. The removed baffle should (in theory) give a bit better flow and a bit more power over the entire rev range (more so at high RPM). Again, I have no dyno data to confirm it.


'89 VN750 Bought stock 4/12/18 @ 17805.9 miles $800. Wrecked once. 27454.5+ miles

Completed modifications:
Removed mufflers, straight pipes out of GB. 110/90 Front Tire. Pick-up coil mod. Shindengen MOSFET FH020AA r/r. USB Outlet + Voltmeter. Repainted Metallic Blue w/ new tank bages. Ear Shave (wo/ coasters) 40/140 NO shims 45MPG. MCCT conversion.

Planned modifications:
Custom LED turn signals. Windshield. Highway Pegs. (Possible) ignition adv. Tuxedo Mod. Ignition coil mod.
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