Degoat, straight pipes? Rejet? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 10 (permalink) Old 09-16-2011, 09:56 PM Thread Starter
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Degoat, straight pipes? Rejet?

So I took the goatbelly and tail pipes off of my exhaust today and it sounds amazing, so Im thinking of welding some pipes up with no crossover, and wrapping them up. My question is...would I have to rejet? Ive hear no, yes, and maybe.
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post #2 of 10 (permalink) Old 09-16-2011, 10:01 PM
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Quote:
Originally Posted by ClassicFnAllen View Post
My question is...would I have to rejet?


Nope!

I hope this helps.

1986 Black Kawasaki Vulcan VN750 "Black KAWK"
VN750 #9300 & VROC #33453

EMGO Handlebar, V&H Exhaust, Drop Shocks, Raised/Painted Fork, MeanStreak Seat, Tank Bib, ME880 Oversize Tires, Engine Guard, Custom Mirrors, Chris Products Turn Signals, Ear Shave, 150/42 Jets, PINGEL Fuel Valve, MCCT, Volt Meter, Shendegen R/R, AGM Battery, Coastered, .020 Coils, Relo Gauges & Headlamp, SilverStar Ultra, LED Flashing Brake Light, Center Stand Delete, WOLO Airhorn.
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post #3 of 10 (permalink) Old 09-16-2011, 10:15 PM
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Shouldn't have to rejet but maybe adjust mixture screws.

87 vn750at least that is what the frame #'s say
"Squirrel Bike" aka Jersey

Rat bike with a good PR agent

shaved and coastered
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rear 170 and front 110
Relocated R/R
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post #4 of 10 (permalink) Old 09-16-2011, 10:16 PM
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Quote:
Originally Posted by ClassicFnAllen View Post
So I took the goatbelly and tail pipes off of my exhaust today and it sounds amazing, so Im thinking of welding some pipes up with no crossover, and wrapping them up. My question is...would I have to rejet? Ive hear no, yes, and maybe.
And after a few years of riding like that you won't hear much of anything anymore.

You really only need to rejet if you alter the intake. (search "earshave")

Changing the exhaust the way you plan will however cause a small loss in power....so it will sound "amazing" , but get beaten by stock bikes.

If You Are Not Sure If I Am Joking or Not....I AM !!Photos:
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post #5 of 10 (permalink) Old 09-17-2011, 09:18 AM
If only it had 6th gear..
 
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These bikes rev too high on the highway to run them straight, just my opinion. I have a feeling you'll get sick of it after a short time (and have headaches) unless you don't do much higway riding but to each his own. I second KM's statement. Performance is much better with back pressure, as with most engines unless modified.
Good luck.

Dave

Mods:
Jetted, shaved & coastered
Home made under-tank single filter
Converted ACCT's to manual (thanks wib714)
Dual vac lines on petcock (my cure for ticking)
LED tail/plate lights
Relocated helmet lock to license plate

Added stuff:
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Chrome levers
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Hmm....she was on the back when we left.... ??
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post #6 of 10 (permalink) Old 09-17-2011, 09:47 AM
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A high RPM V Twin like ours does sound nice with a 2 into 1 with a small muffler attached. A muffler just big enough to take the edge off the sound.

95 VN750 (eBay)31k+
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post #7 of 10 (permalink) Old 09-17-2011, 10:49 AM
If only it had 6th gear..
 
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That sounds interesting. Does it still have a deep tone with a small muffler on it?

Dave

Mods:
Jetted, shaved & coastered
Home made under-tank single filter
Converted ACCT's to manual (thanks wib714)
Dual vac lines on petcock (my cure for ticking)
LED tail/plate lights
Relocated helmet lock to license plate

Added stuff:
Customized hard bags w/ lights
Chrome levers
Hellcat windscreen
LED running lights
Home made 'Vita-Volt' meter
Foot rests on engine guard
Tunes

Hmm....she was on the back when we left.... ??
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post #8 of 10 (permalink) Old 09-18-2011, 04:07 AM Thread Starter
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Quote:
Originally Posted by The DEUCE View Post
Nope!

I hope this helps.
It does. Haha. Sent Im ready to snatch up those parts. Did you not get my PM?

Quote:
Originally Posted by DavesVulster View Post
These bikes rev too high on the highway to run them straight, just my opinion. I have a feeling you'll get sick of it after a short time (and have headaches) unless you don't do much higway riding but to each his own. I second KM's statement. Performance is much better with back pressure, as with most engines unless modified.
Good luck.
I thought running straight pipes adds performance on n/a engines? What if I fabbed a cross pipe where the GB is?
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post #9 of 10 (permalink) Old 09-18-2011, 11:11 AM
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A crossover would be a good idea, several folks have done this.

The odd problem here is the stock system is in fact a "tuned" exhaust ... So getting more power over the entire rpm range with any alteration is almost impossible without sophisticated equipment.

Most of the power loss , and we are really only talking a few hp, when going to less restricted pipes is in the low end to middle. At or near redline open pipes work fine.... But not many run their bike constantly at redline.

If You Are Not Sure If I Am Joking or Not....I AM !!Photos:
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post #10 of 10 (permalink) Old 09-18-2011, 12:16 PM Thread Starter
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Quote:
Originally Posted by Knifemaker View Post
A crossover would be a good idea, several folks have done this.

The odd problem here is the stock system is in fact a "tuned" exhaust ... So getting more power over the entire rpm range with any alteration is almost impossible without sophisticated equipment.

Most of the power loss , and we are really only talking a few hp, when going to less restricted pipes is in the low end to middle. At or near redline open pipes work fine.... But not many run their bike constantly at redline.
Well...if I gotta lose a few hp, at least it wont sound so ricey anymore..haha. Ill just have to stick it out until I can afford to shave it.
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