Stuck float - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
From the gas tank to the carbs
All fuel system discussion

 7Likes
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 23 (permalink) Old 05-21-2020, 07:35 AM Thread Starter
Senior Member
 
MSattler's Avatar
 
Join Date: Jun 2019
Location: Iowa
Posts: 259
iTrader: (0)
 
Stuck float

So I disassembled the 700’s carbs, and cleaned all of the parts with vinegar and brake cleaner. They came out brilliant. I replaced one of the float needles (the spring on the little brass rod seemed stuck), and the other one seemed okay, so I left it. I cannot remember which one was new, because I cleaned the old one and that looked new afterwards too. Then I let the floats sit in the vinegar over night and cleaned those as well. Afterwards, I replaced all gaskets and put it back in. I broke one of the fuel nipples while trying to get the carb out, so that was replaced with the brass one. That was on the rear cylinder. I lubed that up with Vaseline and beat it in with a rubber mallet (gently, it went in snug, but alright). The bike fired right up. Once I turned the petcock to prime, the hose around the brass nipple started spraying gas. I put a hose clamp on, and it was fine. Now the engine becomes so bogged down with gas while sitting, I can pull the plug and send out a torrent of gas and it’ll start up, or try to turn it over several times to clear it. When that happens, there’s always a loud pop from the front cylinder before locking the engine, then it’ll clear the gas out of the coolant tube on the right.

Another interesting thing I noticed, is that if it is running and I tilt the bike far to the left, the bike wants to die. If I do the same on the right, it’s fine. My question is- what should I look for when I pull these bastards again? I poured in a full can of seafoam and have been riding like a jack ass, so everything should still be clean. Could the float be misaligned? I flicked it before installing, and it moved freely, the flog needle went into the tube easily.


Sent from my iPhone using Tapatalk


'08 Road King Classic
'86 VN750:
Ear Shave, K&N Filters, Mean Streak Seat, AGM battery, Blue Wire Mod, Pick-up Coil Mod, Timing Advance Mod, NGK Iridium Plugs and Wire, LEDs, Bed Liner Paint Job, Over-sized Tires, New Brakes, New Fork Seals, Progressive Springs, Kick Stand Mod, Highway Pegs, 40/140 No Shims, Vance & Hines Exhaust, New Grips, Extra Wide Emgo Handle Bars
John 8:44, REV 2:9, REV 3:9 - If you were kicked out of 109 bars, would you think the problem was you, or the 109 bars?

Last edited by MSattler; 05-21-2020 at 08:05 AM.
MSattler is offline  
Sponsored Links
Advertisement
 
post #2 of 23 (permalink) Old 05-21-2020, 08:43 AM
Senior Member
 
ubertalldude's Avatar
 
Join Date: Jun 2016
Location: NE Florida
Posts: 729
iTrader: (0)
 
I'm confused by the pics, do you have a float issue or a massive coolant leak? The pics show a big leak from the coolant tube.

AS for the float, try cleaning the seat really well with a q-tip and do the same to the needle, then maybe press the needle into the seat and twist them together to sort of lap the surfaces together. Then check for free movement and float height. The needle should fall right out when the float isn't pushing it into the seat.
MSattler likes this.

Earshave+Rejet (38/135) – NGK Iridiums – MCCT Conversion – Slipstreamer S03 Windshield – Custom Extended Backrest – Custom Highway Bars – MOSFET R/R – LED Underglow – Volt+USB In-DashTwo-Wire & Blue-Wire Mod – Satin Black Engine Paint – Dampers Parts - Jets: Main=99101-393(#132 stock)/Pilot=n424-22 Pilot(#38 stock)
ubertalldude is offline  
post #3 of 23 (permalink) Old 05-21-2020, 09:02 AM Thread Starter
Senior Member
 
MSattler's Avatar
 
Join Date: Jun 2019
Location: Iowa
Posts: 259
iTrader: (0)
 
If I don’t pull the spark plug and turn over the engine (a ton of gas shoots out), then it pushes coolant from the right side. When starting, the coolant that comes out appears miscolored but not oily. This was after the ride into work, which looked the same after letting it sit. The excess fuel appears to be mixing with the coolant.


Sent from my iPhone using Tapatalk

'08 Road King Classic
'86 VN750:
Ear Shave, K&N Filters, Mean Streak Seat, AGM battery, Blue Wire Mod, Pick-up Coil Mod, Timing Advance Mod, NGK Iridium Plugs and Wire, LEDs, Bed Liner Paint Job, Over-sized Tires, New Brakes, New Fork Seals, Progressive Springs, Kick Stand Mod, Highway Pegs, 40/140 No Shims, Vance & Hines Exhaust, New Grips, Extra Wide Emgo Handle Bars
John 8:44, REV 2:9, REV 3:9 - If you were kicked out of 109 bars, would you think the problem was you, or the 109 bars?
MSattler is offline  
 
post #4 of 23 (permalink) Old 05-21-2020, 09:06 AM
Senior Member
 
Spockster's Avatar
 
Join Date: Nov 2012
Location: WV
Posts: 7,269
iTrader: (5)
   
It can't be fuel and coolant mixing, fuel must just be splashing from somewhere else.

I'd watch for fuel in the oil, sounds like it's filling the cylinder with gas.
MSattler likes this.

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
Repair Manual: http://www.mediafire.com/file/mj7z81..._Catalogue.pdf

Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf
Spockster is offline  
post #5 of 23 (permalink) Old 05-21-2020, 09:16 AM Thread Starter
Senior Member
 
MSattler's Avatar
 
Join Date: Jun 2019
Location: Iowa
Posts: 259
iTrader: (0)
 
So the cylinder getting flooded with gas - stuck float. Do you really adjust the float? Maybe I didn't get the rod seated correctly? I will flush the coolant tonight/tomorrow. Maybe there's a clog, because when turning over the engine after flooding, it pushes coolant out. Maybe not mutually inclusive.

'08 Road King Classic
'86 VN750:
Ear Shave, K&N Filters, Mean Streak Seat, AGM battery, Blue Wire Mod, Pick-up Coil Mod, Timing Advance Mod, NGK Iridium Plugs and Wire, LEDs, Bed Liner Paint Job, Over-sized Tires, New Brakes, New Fork Seals, Progressive Springs, Kick Stand Mod, Highway Pegs, 40/140 No Shims, Vance & Hines Exhaust, New Grips, Extra Wide Emgo Handle Bars
John 8:44, REV 2:9, REV 3:9 - If you were kicked out of 109 bars, would you think the problem was you, or the 109 bars?
MSattler is offline  
post #6 of 23 (permalink) Old 05-21-2020, 09:57 AM
Senior Member
 
Spockster's Avatar
 
Join Date: Nov 2012
Location: WV
Posts: 7,269
iTrader: (5)
   
Quote:
Originally Posted by MSattler View Post
So the cylinder getting flooded with gas - stuck float. Do you really adjust the float? Maybe I didn't get the rod seated correctly? I will flush the coolant tonight/tomorrow. Maybe there's a clog, because when turning over the engine after flooding, it pushes coolant out. Maybe not mutually inclusive.
Probably just the float sticking, from misalignment or debris. Adjustment can make the fuel level too high/low, but if it was ok then suddenly isn't, it's not adjustment.

I'm with ubertalldude, I'm confused. There's just no connection to fuel and coolant. Unless the cylinder is cracked or gasket blown, and fuel is getting pushed in the coolant jackets.

You say coolant comes from the chrome tube at the engine case? If it pushes out of there when cranking, it must have a blown cylinder some way. I'm thinking/hoping that's not the case.
MSattler likes this.

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
Repair Manual: http://www.mediafire.com/file/mj7z81..._Catalogue.pdf

Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf
Spockster is offline  
post #7 of 23 (permalink) Old 05-21-2020, 10:25 AM Thread Starter
Senior Member
 
MSattler's Avatar
 
Join Date: Jun 2019
Location: Iowa
Posts: 259
iTrader: (0)
 
Stuck float

Lets hope not! It seems to drive fine, the gauge never leaving the second hash mark. It runs a little warmer than the 750, but not outside of the normal range. I will pull the carb this weekend and try adjusting it. There was no fuel leak before I pulled the carbs when I first got, nor coolant leak. Could the increased pressure in the cylinder from the excess fuel cause this? Liquid always finds the weakest point. I didn't clean the tank or pull the petcock, so who knows what debris are in there. So much for flipping this! When I pulled the metal rod that holds the float needle, I just pulled it off, cleaned it, and tapped it back into place. I am unsure how to adjust the float, but I did what you had recommended last year, and made sure it was springy and moved freely. The float floated for 24 hours without sinking, but I did not check it for hairline cracks. There was no fluid inside when I pulled them from their bath and cleaned them. I will take better note when I go to start it today. The full can of seafoam seems to be working at least, as it is more responsive and occasionally gets puffs of black smoke with the back fires. I have noticed that the exhaust appears to have condensation on it. I didn't ear shave this one, and I plan on putting the sporster exhaust, since I am missing the left muffler past the heat shield. Could coolant be getting into the cylinder? Just spit balling here. It appears to drive fine, besides that I have used almost a full tank in 23 miles (revving it quite a bit, and keeping the rpms at 5k+ most of the time and A fuel leak)

'08 Road King Classic
'86 VN750:
Ear Shave, K&N Filters, Mean Streak Seat, AGM battery, Blue Wire Mod, Pick-up Coil Mod, Timing Advance Mod, NGK Iridium Plugs and Wire, LEDs, Bed Liner Paint Job, Over-sized Tires, New Brakes, New Fork Seals, Progressive Springs, Kick Stand Mod, Highway Pegs, 40/140 No Shims, Vance & Hines Exhaust, New Grips, Extra Wide Emgo Handle Bars
John 8:44, REV 2:9, REV 3:9 - If you were kicked out of 109 bars, would you think the problem was you, or the 109 bars?

Last edited by MSattler; 05-21-2020 at 11:05 AM.
MSattler is offline  
post #8 of 23 (permalink) Old 05-21-2020, 10:43 AM
Senior Member
 
Spockster's Avatar
 
Join Date: Nov 2012
Location: WV
Posts: 7,269
iTrader: (5)
   
I wouldn't attempt adjustment until float/fuel level in the bowl is checked. There's a specific way to do this before the carbs are removed. (see manual) Hard, or impossible to do if the float is stuck.

Sometimes, careful but sharp whacks on the sides of the carb can free the float. Like a screwdriver handle and many quick raps to vibrate the carb.

Black smoke means excess fuel.

It will see excess pressure if the cylinder is filled with gas, but it has to have a blown gasket or cracked cylinder to push fuel into the coolant.

If it's getting coolant into the cylinder, you should see evidence of that on a spark plug. Looking steam cleaned or tiny water droplets on the plug.
MSattler likes this.

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
Repair Manual: http://www.mediafire.com/file/mj7z81..._Catalogue.pdf

Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf
Spockster is offline  
post #9 of 23 (permalink) Old 05-21-2020, 11:35 AM Thread Starter
Senior Member
 
MSattler's Avatar
 
Join Date: Jun 2019
Location: Iowa
Posts: 259
iTrader: (0)
 
Okay, so to recap:
Step one -
Hard tap on side of bowl
Step two -
float fuel check before carbs are removed
Head gasket check - coolant in oil, spark plug condensation, and excessive heat?
If nothing is wrong with fuel float level - remove and try to remove and reset the float and needle? Not sure what to do about the coolant hose besides checking the gasket.

'08 Road King Classic
'86 VN750:
Ear Shave, K&N Filters, Mean Streak Seat, AGM battery, Blue Wire Mod, Pick-up Coil Mod, Timing Advance Mod, NGK Iridium Plugs and Wire, LEDs, Bed Liner Paint Job, Over-sized Tires, New Brakes, New Fork Seals, Progressive Springs, Kick Stand Mod, Highway Pegs, 40/140 No Shims, Vance & Hines Exhaust, New Grips, Extra Wide Emgo Handle Bars
John 8:44, REV 2:9, REV 3:9 - If you were kicked out of 109 bars, would you think the problem was you, or the 109 bars?
MSattler is offline  
post #10 of 23 (permalink) Old 05-21-2020, 11:57 AM
Members who have donated towards server costs
 
flitecontrol's Avatar
 
Join Date: Dec 2008
Location: Monroe, LA
Posts: 4,715
iTrader: (14)
 
If the cylinders are filling with gas, that sounds like a leaking petcock in addition to a bad float valve.
MSattler likes this.

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
flitecontrol 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