Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums - Reply to Topic
Carbs and Fuel System
From the gas tank to the carbs
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Thread: Sluggish running and guzzling fuel. Reply to Thread
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  Topic Review (Newest First)
06-28-2018 08:18 PM
dunthyon It takes about 10 miles before it starts to stutter. When I checked last the plugs were wet after a stall out. The foam isn't falling apart so I doubt that's the cause. I have yet to check if it's charging all the time so it could be the stator. There is 100% no rust in the tank and the hoses are for sure placed properly. Even the vent hose is properly routed to the little holder in the ear.
06-28-2018 07:53 PM
Spockster We need to know what is missing when it stalls out. Fuel or spark?

Have we verified that it's charging all the time?

How long until it stalls out? Are the plugs wet or dry when it stalls? (just pull one from each cylinder)

Are there piles of rust in the tank?

Are the fuel and vent hoses mixed up?

It looks like a lot of people asked important questions early in this thread, but didn't really get answers.

I saw you were unsure about the air filters. Should probably take the filters out and see if the foam is falling apart. That foam gets sucked into the air box, ducts, and carbs, then blocks air flow, it's happened before.
06-28-2018 03:48 PM
dunthyon It's the Yamaha one with a single fuel port and single vacuum port. It does fire but it won't go long distance.
06-28-2018 10:08 AM
Spockster
Quote:
Originally Posted by dunthyon View Post
They also used the single-vacuum port tap..
Are you talking about a gravity fed petcock with one fuel outlet?

Assuming it gets enough fuel from the petcock, it sounds like the carbs may need revisited.

Will it start at all now?
06-27-2018 10:59 PM
dunthyon Okay RECAP! Bike was not running when I first got it. Shop I took it to got it running "properly" for about 2.5 months, it didn't have the issue where it would just up and stall out. They did a carb rebuild, cleaning, etc. and got it running. They never installed the vent hose properly but it didn't cause an issue at all until a while later. They also used the single-vacuum port tap. I tried leaving the gas cap off, gutting the gas cap and cleaning, rerouting the vent hose I installed, all the fixes I've read so far except cleaning the carbs/backblowing as the shop had (I assumed) taken care of it. As of now however I fully believe they didn't do their job. It rides okay for a few miles then starts bogging down until even at full throttle it acts like I'm at 1/4 throttle essentially until it stalls. At one point, the last time it happened, I couldn't get it to start back up and the bike wouldn't even try to start as it seemed like the battery died. That's where we're at now. Stumped and trying to figure out the issue.
06-27-2018 10:47 PM
Spockster
Quote:
Originally Posted by dunthyon View Post
Reviving this thread to ask about the issue again. Me and my mechanic friend are very stumped by this issue, all I know that might be a cause is the shop I took the bike to used a carb repair kit but I wouldn't imagine that would cause the issue. Ideas? I've been unable to ride for a month now.
Gonna need a recap of what has been checked, did anything help, did it ever run, etc.

Looks like we're back to the original carb rebuild.
06-27-2018 10:25 PM
dunthyon Reviving this thread to ask about the issue again. Me and my mechanic friend are very stumped by this issue, all I know that might be a cause is the shop I took the bike to used a carb repair kit but I wouldn't imagine that would cause the issue. Ideas? I've been unable to ride for a month now.
05-12-2018 04:07 PM
dunthyon My battery is also nearly dead apparently. Guess that would do it too. Ugh.
05-12-2018 03:44 PM
dunthyon I replaced the Petcock and removed pretty much everything in the gas cap but the lock mechanism and the bike still has POOGS or something. I left the cap open to run it and it's doing the same thing. It popped when I tried to start it. Tried giving it throttle and it cut off. I don't get it. I also have the MCCT mod. Nothing is wrong with this bike that I can tell so I don't see why it's stalling every time.
05-10-2018 01:19 PM
JETHRO well, I had an old Suzuki that had same problem and the fuel system is similar to the vn 750 , I spent 160 in garage fees till I found out myself the diaphragm was split and making the bike run crap, The problem you have is its an intermittent fault but maybe something is loose inside the tap, but I would get that right first before you try other things .
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