help please!!custom straight pipes - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
From the gas tank to the carbs
All fuel system discussion

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 18 (permalink) Old 10-16-2009, 08:53 PM Thread Starter
Senior Member
 
letitflight's Avatar
 
Join Date: Mar 2006
Posts: 668
iTrader: (0)
 
help please!!custom straight pipes

Howdy !

i need some help ! i just made some custom straight pipes 2" and wrapped them with some exhaust wrap. i used the original header pipes and added 2" tube. the 'connexion' between both pipes is tight..no air leaks.
BUT, now the bike is not running right, it seems to hesitate while going up on RPMs. It iddles just fine.
Any ideas?? do you think i will have to rejet this puppy?? (i hope not)

also:
carb is CLEAN
no 'kink' with the fuel lines
new air cleaners (K&N)
Seafoam'ed
air/fuel screw is at 3 turn, i have also tried various settings from 2 turns to 3 1/2 = on difference.
sparkplugs seems to be fine (normal coloring)
battery is good

Thanks in advance!!!

PEACE!!!

2005 Vulcan 750
letitflight is offline  
Sponsored Links
Advertisement
 
post #2 of 18 (permalink) Old 10-16-2009, 09:04 PM
Senior Member
 
STUMPYSKAW's Avatar
 
Join Date: Sep 2009
Location: South-Central, MO
Posts: 149
iTrader: (0)
 
One simple test is when you're excelarrating and the bike starts to hesitate try useing the choke just a little bit, this will richen the air fuel ratio.
Got any pics of the pipes?

"DAISY" 85 VN 700 19K
Owned since 09/12/09
Done list
Windshield
Marbled
Metal radiator drain plug
Removed exhaust baffles
TOCMAN. ACCT's
VN900 Seat

TO Do list
To much to list


VN900 seat on my VN700
https://www.vn750.com/forum/showthread.php?t=12903

Debaffling my stock pipes
https://www.vn750.com/forum/showthread.php?t=12756
STUMPYSKAW is offline  
post #3 of 18 (permalink) Old 10-16-2009, 10:55 PM
Senior Member
 
dirtrack650's Avatar
 
Join Date: Jul 2007
Location: Castle Rock, Wa
Posts: 1,750
iTrader: (0)
 
K&N's and Pipes? you bet you need to rejet. I'd go 142's on the mains, maybe higher. Your engine will run so much smoother and the power will be restored, even more than stock.

DT

95 VN750 (eBay)31k+
GL1100 front fender
OEM engine guard
OEM high back rest
'V-Twin' HWY pegs
Black 750 Spectre handlebars
SunPro Volt Meter (Amazon)
Maier bug shield (JCW)
Bar Ends anti-vibe (JCW)
Emgo air filters
Tank bag-Eclipse
Tail bag-FroZone Cooler
Back Rest-Igloo 6 pak cooler
WalMart Saddle Bags
R/R Relocate
Dry Splines Lubed
AGM DieHard-Sears
Gutted Goat
Sporster XL Mufflers
LED's-stop,tail,turn,marker
Pickup coil mod to .45mm
Silverstar headlight
Rotella T6
dirtrack650 is offline  
 
post #4 of 18 (permalink) Old 10-16-2009, 11:05 PM
The Professor
 
lance328's Avatar
 
Join Date: Feb 2008
Location: BUFORD, GEORGIA
Posts: 3,147
iTrader: (15)
   
Quote:
Originally Posted by dirtrack650 View Post
K&N's and Pipes? you bet you need to rejet. I'd go 142's on the mains, maybe higher. Your engine will run so much smoother and the power will be restored, even more than stock.

DT
I just got off the phone with him, he did K&N replacement filters not an ear shave. He's basicaly stock with open exhaust. I told him a couple of things to try, and that he might need to baffle or go with #40 pilot jets and #135 mains. Once the rpm's are up it's fine it just stumbles on acceleration.


85 VN700 "Old Yella"

REBUILT ENGINE
CUSTOM PAINT
VANCE & HINES CRUZERS
EAR SHAVED AND RE-JETTED W/K&N'S
DUNLOP ELITE K591 FRONT & REAR
VOLTMETER
SYNTHETIC BRAKE FLUID
SYNTHETIC OIL & GEAR LUBE
PLEXISTAR 2 WINDSHIELD
SPLINES LUBED
ACCT'S GREASED W/TOC SPRINGS
COASTERD
LEATHER SADDLE BAGS
LEATHER TOOL AND ROLL BAG
PICKUP COILS GAPPED AT .018"
NGK CAP, WIRES, IRIDUMS
BARNETT FRICTION PLATES & SPRINGS
CUSTOM GRIPS, MIRRORS, LEVERS
ORIGINAL STATOR & R/R 14.5v
DEKA MF AGM ETX15L

Best Auto/Moto Insurance | Motorcycle Protection Today | FREE Trade-In Quote
lance328 is offline  
post #5 of 18 (permalink) Old 10-17-2009, 09:01 AM
On His Lady Vulcan
 
wkrizan's Avatar
 
Join Date: Apr 2008
Location: Washington State
Posts: 1,647
iTrader: (10)
 
Quote:
Originally Posted by lance328 View Post
I just got off the phone with him, he did K&N replacement filters not an ear shave. He's basicaly stock with open exhaust. I told him a couple of things to try, and that he might need to baffle or go with #40 pilot jets and #135 mains. Once the rpm's are up it's fine it just stumbles on acceleration.
Did he adjust his air/mix screws out 2 3/4 turns or more?




P.S. I agree...where them damn pics of these pipes?

"You came out of your mom looking like SHlT. She thought you were beautiful. Don't know what scared me most, your looks or her judgment."











Pictures of the "Ladies"
wkrizan is offline  
post #6 of 18 (permalink) Old 10-17-2009, 03:21 PM
Senior Member
 
ohio_redneck75's Avatar
 
Join Date: Jul 2009
Location: coshocton,oh
Posts: 166
iTrader: (0)
 
i have done the same made my own drag pipes. have u marbled it yet? i have stock k-n filters has well. bike runs like a beast turned the AF screws to 3 and marbled and all is good

2002 vn750,7800 mile,homemade drag pipes,harley heratige seat,honda sissybar,led rear turn signals,
iridium plugs,marbled,110/90/19 kenda kruz front,
170/80/15 kenda kruz rear,saddlebags.
whats to come****handlebars,highway pegs
ohio_redneck75 is offline  
post #7 of 18 (permalink) Old 10-17-2009, 04:47 PM
The Professor
 
lance328's Avatar
 
Join Date: Feb 2008
Location: BUFORD, GEORGIA
Posts: 3,147
iTrader: (15)
   
He's marbled and has the screws out 3.0 turns. I also told him since the bike was down for a stator replacement, to put a healthy shot of Seafoam in .


85 VN700 "Old Yella"

REBUILT ENGINE
CUSTOM PAINT
VANCE & HINES CRUZERS
EAR SHAVED AND RE-JETTED W/K&N'S
DUNLOP ELITE K591 FRONT & REAR
VOLTMETER
SYNTHETIC BRAKE FLUID
SYNTHETIC OIL & GEAR LUBE
PLEXISTAR 2 WINDSHIELD
SPLINES LUBED
ACCT'S GREASED W/TOC SPRINGS
COASTERD
LEATHER SADDLE BAGS
LEATHER TOOL AND ROLL BAG
PICKUP COILS GAPPED AT .018"
NGK CAP, WIRES, IRIDUMS
BARNETT FRICTION PLATES & SPRINGS
CUSTOM GRIPS, MIRRORS, LEVERS
ORIGINAL STATOR & R/R 14.5v
DEKA MF AGM ETX15L

Best Auto/Moto Insurance | Motorcycle Protection Today | FREE Trade-In Quote
lance328 is offline  
post #8 of 18 (permalink) Old 10-18-2009, 08:30 AM
Senior Member
 
dirtrack650's Avatar
 
Join Date: Jul 2007
Location: Castle Rock, Wa
Posts: 1,750
iTrader: (0)
 
But you got to look at the plugs after 30-40 minutes of riding at interstate speeds. I bet they are white. Any K&N filter should have a jet change whether it's pods or stock replacement and with pipes, a larger jet will keep things cooler and smooth. First place to look for overheating is the head pipe from the front cyl: check for color change in the chrome.

DT

95 VN750 (eBay)31k+
GL1100 front fender
OEM engine guard
OEM high back rest
'V-Twin' HWY pegs
Black 750 Spectre handlebars
SunPro Volt Meter (Amazon)
Maier bug shield (JCW)
Bar Ends anti-vibe (JCW)
Emgo air filters
Tank bag-Eclipse
Tail bag-FroZone Cooler
Back Rest-Igloo 6 pak cooler
WalMart Saddle Bags
R/R Relocate
Dry Splines Lubed
AGM DieHard-Sears
Gutted Goat
Sporster XL Mufflers
LED's-stop,tail,turn,marker
Pickup coil mod to .45mm
Silverstar headlight
Rotella T6
dirtrack650 is offline  
post #9 of 18 (permalink) Old 10-18-2009, 09:55 AM
Senior Member
 
ohio_redneck75's Avatar
 
Join Date: Jul 2009
Location: coshocton,oh
Posts: 166
iTrader: (0)
 
ill check mine today and see but it runs so good and dosent act like it running lean

2002 vn750,7800 mile,homemade drag pipes,harley heratige seat,honda sissybar,led rear turn signals,
iridium plugs,marbled,110/90/19 kenda kruz front,
170/80/15 kenda kruz rear,saddlebags.
whats to come****handlebars,highway pegs
ohio_redneck75 is offline  
post #10 of 18 (permalink) Old 10-18-2009, 02:07 PM
The Professor
 
lance328's Avatar
 
Join Date: Feb 2008
Location: BUFORD, GEORGIA
Posts: 3,147
iTrader: (15)
   
Quote:
Originally Posted by dirtrack650 View Post
But you got to look at the plugs after 30-40 minutes of riding at interstate speeds. I bet they are white. Any K&N filter should have a jet change whether it's pods or stock replacement and with pipes, a larger jet will keep things cooler and smooth. First place to look for overheating is the head pipe from the front cyl: check for color change in the chrome.

DT
He says the plugs look good, no sign of a lean condition. There is something going on with the carbs, kinda sounds like a vacuum leak.


85 VN700 "Old Yella"

REBUILT ENGINE
CUSTOM PAINT
VANCE & HINES CRUZERS
EAR SHAVED AND RE-JETTED W/K&N'S
DUNLOP ELITE K591 FRONT & REAR
VOLTMETER
SYNTHETIC BRAKE FLUID
SYNTHETIC OIL & GEAR LUBE
PLEXISTAR 2 WINDSHIELD
SPLINES LUBED
ACCT'S GREASED W/TOC SPRINGS
COASTERD
LEATHER SADDLE BAGS
LEATHER TOOL AND ROLL BAG
PICKUP COILS GAPPED AT .018"
NGK CAP, WIRES, IRIDUMS
BARNETT FRICTION PLATES & SPRINGS
CUSTOM GRIPS, MIRRORS, LEVERS
ORIGINAL STATOR & R/R 14.5v
DEKA MF AGM ETX15L

Best Auto/Moto Insurance | Motorcycle Protection Today | FREE Trade-In Quote
lance328 is offline  
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

Once registered, your User Name"cannot be changed". We can make exceptions within 7 days, but after that, it is set in stone.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome