Throttle Issues - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 16 (permalink) Old 10-14-2010, 06:45 PM Thread Starter
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Throttle Issues

Well I just got my Vulcan 750 about a week ago. Since I bought the bike I've been doing some fixing to it cause of a few problems the bike had. Well I just took the bike out for a little test run and once I get the bike into 3rd gear and open the throttle all the way up it doesn't want to move worth crap. The engine will start to stall itself out. Now when I go to put it in 4th gear the same thing happens, and I'm not able to put it in 5th gear at all cause the bike will just die out. Even if I'm gentle on the throttle it basically doesn't want to go above 30 MPH at all. Hopefully there is some ideas on what could be the problem. I've searched the forum, but haven't really had time to go through allt he posts I've found and so far haven't found any that relate to the issue I'm having with my bike. Thank you all in advance for all the help.

1990 Kawasaki Vulcan 750
12,000
English Version

ACCT to MCCT conversion video
https://www.vn750.com/forum/showthread.php?t=18235

ACCT to MCCT Conversion Thread created by wib714
https://www.vn750.com/forum/showthread.php?t=17917

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post #2 of 16 (permalink) Old 10-14-2010, 07:05 PM
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Sounds like the carb is dirty, the choke lever may not be fully off, the carb breather hose that goes to the right air filter housing (ear) has fallen out or bottomed out or some combination of the above.

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
_____________________________________________
"Black Beauty"
1989 VN750 acquired December, 2008, 6,711 miles
Currently 23,298 miles

Old Blue
2001 Honda CMX250 Rebel acquired July, 2008

1987 VN750 project bike, acquired August, 2009, 33,000 miles and balancer sticking out of the case, currently awaiting attention and parts
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post #3 of 16 (permalink) Old 10-14-2010, 07:54 PM Thread Starter
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Quote:
Originally Posted by flitecontrol View Post
Sounds like the carb is dirty, the choke lever may not be fully off, the carb breather hose that goes to the right air filter housing (ear) has fallen out or bottomed out or some combination of the above.
motorcycles so I don't want to sound to stupid, but with the carb breather hose that goes from the right air filter housing (ear) has fallen out or bottomed out. I have no idea what you are talking about with that one. lol. I'm really sorry I have no knowledge about motorcycles.

1990 Kawasaki Vulcan 750
12,000
English Version

ACCT to MCCT conversion video
https://www.vn750.com/forum/showthread.php?t=18235

ACCT to MCCT Conversion Thread created by wib714
https://www.vn750.com/forum/showthread.php?t=17917

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post #4 of 16 (permalink) Old 10-14-2010, 11:01 PM
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Look at the right air filter housing, also known on this forum as the "ears" (plastic chrome piece with false louvers on the outside). If the ears have not been removed ("earshave"), there should be a rubber hose going into the housing. Trace it back to the carburetor and make sure it is connected to the carb and isn't cracked/split/etc. If it is, replace it. Then pull the hose out of the filter housing, cut the end at a 45 degree angle and shove it back in.

If this hose bottoms out against the housing, falls out, or cracks, the bike will not run well, especially at speed. It needs to be protected from wind.

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
_____________________________________________
"Black Beauty"
1989 VN750 acquired December, 2008, 6,711 miles
Currently 23,298 miles

Old Blue
2001 Honda CMX250 Rebel acquired July, 2008

1987 VN750 project bike, acquired August, 2009, 33,000 miles and balancer sticking out of the case, currently awaiting attention and parts

Last edited by flitecontrol; 10-14-2010 at 11:04 PM.
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post #5 of 16 (permalink) Old 10-14-2010, 11:24 PM Thread Starter
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Ok now I know what your talking about. My bike has two of those on the left and right side. The rubber hoses go into a plastic housing that travels to both carbs. Off the plastic house there is 2 rubber hoses that go to each carb. The one on the left side I got it in place really easily, but the one on the right side I can't get it to snap into place and stay there on the carb. The hose is new, but a really tight fit in there. That could possibly be the problem then. I'll check that out tomorrow and see if I can get it put in place and snapped in.

1990 Kawasaki Vulcan 750
12,000
English Version

ACCT to MCCT conversion video
https://www.vn750.com/forum/showthread.php?t=18235

ACCT to MCCT Conversion Thread created by wib714
https://www.vn750.com/forum/showthread.php?t=17917

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post #6 of 16 (permalink) Old 10-15-2010, 10:10 AM
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Still don't think we are on the same page. The hose I am talking about only goes to the right ear. About 3/8-1/2" in diameter and located on the top rear part of the filter housing. If you look where the gas tank transitions from horizontal to vertical, the hose is right under there.

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
_____________________________________________
"Black Beauty"
1989 VN750 acquired December, 2008, 6,711 miles
Currently 23,298 miles

Old Blue
2001 Honda CMX250 Rebel acquired July, 2008

1987 VN750 project bike, acquired August, 2009, 33,000 miles and balancer sticking out of the case, currently awaiting attention and parts
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post #7 of 16 (permalink) Old 10-15-2010, 10:57 PM
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Do these pictures help at all?
https://www.vn750.com/photopost/showp...o=1226&cat=503

https://www.vn750.com/photopost/showp...o=1757&cat=503

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/11-vn750-general-discussion/9127-top-ten-items-you-would-suggest-new-owner-do-his-new-ride.html
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post #8 of 16 (permalink) Old 10-16-2010, 06:20 PM Thread Starter
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I looked at all the hoses, and they are all connected to the right place on the bike. There is one hose that I can't for the life of me figure out where it is suppose to connect at. I'm providing a link to my photobucket with the different pictures that I took of the hoses, and there is a picture from the manual that I downloaded off of here that will have the hose on it that I can't for the life of me figure out where it goes. The image from the book I have the hose circled in red with the part number and everything.

http://s281.photobucket.com/albums/kk220/netmatrix1/1990%20Kawasaki%20Vulcan%20750/

1990 Kawasaki Vulcan 750
12,000
English Version

ACCT to MCCT conversion video
https://www.vn750.com/forum/showthread.php?t=18235

ACCT to MCCT Conversion Thread created by wib714
https://www.vn750.com/forum/showthread.php?t=17917

Proximity Construction
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post #9 of 16 (permalink) Old 10-16-2010, 06:29 PM
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Could this be a California bike?

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
_____________________________________________
"Black Beauty"
1989 VN750 acquired December, 2008, 6,711 miles
Currently 23,298 miles

Old Blue
2001 Honda CMX250 Rebel acquired July, 2008

1987 VN750 project bike, acquired August, 2009, 33,000 miles and balancer sticking out of the case, currently awaiting attention and parts
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post #10 of 16 (permalink) Old 10-16-2010, 06:48 PM Thread Starter
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I know it isn't a California bike. It was bought in Missouri and the 2 owners before me live in the same town I live in in Illinois. It doesn't have the California emission parts on it that it shows in the book.

1990 Kawasaki Vulcan 750
12,000
English Version

ACCT to MCCT conversion video
https://www.vn750.com/forum/showthread.php?t=18235

ACCT to MCCT Conversion Thread created by wib714
https://www.vn750.com/forum/showthread.php?t=17917

Proximity Construction
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