Kawasaki VN750 Forum banner

1 - 16 of 16 Posts

·
Into the Darkness
Joined
·
272 Posts
Discussion Starter #1
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.
 

·
Premium Member
Joined
·
4,778 Posts
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.
 

·
Into the Darkness
Joined
·
272 Posts
Discussion Starter #3
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.
 

·
Premium Member
Joined
·
4,778 Posts
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.
 

·
Into the Darkness
Joined
·
272 Posts
Discussion Starter #5
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.
 

·
Premium Member
Joined
·
4,778 Posts
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.
 

·
Linkmeister Supreme
Joined
·
7,960 Posts

·
Into the Darkness
Joined
·
272 Posts
Discussion Starter #8
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/
 

·
Premium Member
Joined
·
4,778 Posts
Could this be a California bike?
 

·
Into the Darkness
Joined
·
272 Posts
Discussion Starter #10
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.
 

·
Into the Darkness
Joined
·
272 Posts
Discussion Starter #11
The new problem is now I drained all the oil out of the bike, and noticed that there was a lot of gas mixed into the oil. I don't know what would have caused this to happen if maybe the floats on the carbs are out of wack or what the problem could be.
 

·
Premium Member
Joined
·
4,778 Posts
Sounds like stuck float(s).
 

·
Premium Member
Joined
·
4,778 Posts
Stuck floats are often the result of a bit of foreign material catching in the float valve. Sometimes, just tapping on the float bowl with a screwdriver handle will dislodge the crud and fix the problem. Might try that first. Doesn't cost nearly what you're fixin' to pay.
 

·
Into the Darkness
Joined
·
272 Posts
Discussion Starter #15
I have to get the carbs cleaned/rebuilt anyhow. They are dirty on the inside of them, and it's something I don't want to do myself. I'm not really that good with cleaning carbs/rebuilding them. They are cutting me a good deal on it though. It's going to be $60.00 to clean and rebuild the both of them, and I think the rebuild kit is $40 or something like that. Plus I need to find out what else is wrong with this bike before I put it on the road, and professionals will be able to get a better idea than I can.
 

·
Into the Darkness
Joined
·
272 Posts
Discussion Starter #16
Well even though I didn't want to do this, but I got bored one day and took the carbs off my bike so I could clean them and see what was wrong with the carbs and the throttle issues. Well after taking the carbs apart I found that the valve, vacuum was torn on the right carb. I looked at cheapcycles, and they have a good price for a new one. I'm going to order that part and put it in the carb, and we will see if that resolves the problems or not. I'm also going to replace the floats as well. Other than that the carbs are in good condition they just needed a really good cleaning. It won't be till next year before I'm able to start this bike up again since I'm doing the restoration on the bike with giving it a fresh paint job, but lets hope for the best on the carbs right now.
 
1 - 16 of 16 Posts
Top