Baffle plate drilling inquiry - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 12 (permalink) Old 05-04-2014, 01:50 PM Thread Starter
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Baffle plate drilling inquiry

I've drilled four 3/8 holes in the rear baffle plates on both sides. It sounds nice but just a little throaty. I'd like a little more sound. I only drilled the holes in the outer plate. What effects will I gain though drilling the same holes in the plate directly under that one? I'm also considering 8 holes
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post #2 of 12 (permalink) Old 05-04-2014, 03:53 PM Thread Starter
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I just drilled the full 8 holes in both sides. I enjoy it alot more.

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post #3 of 12 (permalink) Old 05-04-2014, 06:40 PM
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I have 8 holes in the back plate of the stock mufflers (with stock exhaust) and the Goat's belly still in place. It sounds deeper and not too loud, but gets attention....which is what I wanted so others on the road know I am there without being obnoxiously loud.

I tried it with straight pipes and just a crossover pipe in place of the Goat's belly, but it was annoyingly loud and unbearable on the highway IMO. I also tried it with Goat's belly in place and gutted mufflers...loud and rumbly, but drove me nuts on the highway and ran too lean.


With the belly in place there is plenty of back-pressure for the bike to run properly.
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post #4 of 12 (permalink) Old 05-04-2014, 07:48 PM
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Quote:
Originally Posted by kc2dgq View Post
I have 8 holes in the back plate of the stock mufflers (with stock exhaust) and the Goat's belly still in place. It sounds deeper and not too loud, but gets attention....which is what I wanted so others on the road know I am there without being obnoxiously loud.

I tried it with straight pipes and just a crossover pipe in place of the Goat's belly, but it was annoyingly loud and unbearable on the highway IMO. I also tried it with Goat's belly in place and gutted mufflers...loud and rumbly, but drove me nuts on the highway and ran too lean.


With the belly in place there is plenty of back-pressure for the bike to run properly.
I've heard Anthony's setup and it sounds sweet

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post #5 of 12 (permalink) Old 05-04-2014, 08:34 PM Thread Starter
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As I said I drilled 8 holes in the baffles plates in both sides. The bike seems to be running slightly hot staying in the middle of the temp gauge. Does this mean that it's running lean now and I need to adjust the carburetor

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post #6 of 12 (permalink) Old 05-04-2014, 08:42 PM
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Middle of the gauge should be normal temp.

So 3/8" holes then?

I'd love to hear an audio clip of one with goat and 8 holes, might do mine if it's not too awfully loud. Some of them sound like an atv with a White Bros. pipe, putt putt putt.

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post #7 of 12 (permalink) Old 05-04-2014, 10:43 PM Thread Starter
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Hope this works for you Spockster. Best quality I could do. http://youtu.be/bddtgy4JUlI
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post #8 of 12 (permalink) Old 05-04-2014, 11:24 PM
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That was quick, thanks.

Doesn't sound bad, no putt putt or blatt blatt, still mellow in the video anyway. I like quieter pipes, but find myself goosing the carbs to wake certain drivers in traffic. Would like the pipes to be at least as loud as my shaved carbs.

Unlike my neighbor with chopped off pipes, insanely loud, especially around 6am. Not even a good sound, just RAAAAAAAAAAAARRRRRGHH blut blut blut He's got about 18" of downpipes and that's it.

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post #9 of 12 (permalink) Old 05-05-2014, 05:25 PM
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Tone is dependant on the muffler volume (inside size)....the larger the muffler, the deeper the sound.....Harley Sportster muffs sound really nice on these bikes and are easy to find cheap used thru Ebay....

Invision the difference between a piccolo and a tuba.....its all in the volume....



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post #10 of 12 (permalink) Old 05-06-2014, 12:05 PM
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Quote:
Originally Posted by Wolfie View Post
Tone is dependant on the muffler volume (inside size)....the larger the muffler, the deeper the sound.....Harley Sportster muffs sound really nice on these bikes and are easy to find cheap used thru Ebay....

Invision the difference between a piccolo and a tuba.....its all in the volume....
lots of volume in the Goat Belly...which is why it works best with stock exhaust drilled...a nice tone IMO.

If you remove the belly, then a larger muffler volume is the cure for the tinny sound, but I still think it is to much of a POP-POP-POP sound...just my opinion obviosly.
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