Author Topic: Sticking float valve help  (Read 3175 times)

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Offline NJDave

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Sticking float valve help
« on: June 12, 2016, 07:20:21 pm »
The float valve on my number 4carb keeps sticking shut. I drop the float bowl and everything moved freely. After  short ride you feel it cut out. Checking the float level afterword reveals no gas in the bowl. All other carbs are spot on. I put in a new needle from Murphs. How can I get it to stop sticking?
1999 Concours

Offline BigK

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Re: Sticking float valve help
« Reply #1 on: June 12, 2016, 08:19:40 pm »
Did you replace the needle seat to? clean the pin that float pivots on?  And a word of caution it could also stick open and lead to vapor lock so be careful when starting it that it is not vapor locked. Good Luck.
Kevin
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Offline NJDave

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Re: Sticking float valve help
« Reply #2 on: June 12, 2016, 08:54:20 pm »
I did not change the seat. I only swapped out the valve after this happened the first time.
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Offline MAN OF BLUES

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Re: Sticking float valve help
« Reply #3 on: June 13, 2016, 06:50:21 pm »
Did you replace the needle seat to? clean the pin that float pivots on?  And a word of caution it could also stick open and lead to vapor lock so be careful when starting it that it is not vapor locked. Good Luck.


The seat is not replacable.....it is pressed into the body. ::)

I have to ask, so....
Did you reinstall the little wire clipon holder correctly on the new needle????
Like this....???
« Last Edit: June 13, 2016, 06:56:54 pm by MAN OF BLUES »

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Offline NJDave

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Re: Sticking float valve help
« Reply #4 on: June 13, 2016, 08:52:41 pm »
Thanks for the pic. Yes, new clip installed also. They came with the kit from Murph's.
I removed the bowl. The float seems to move up and down freely. I put it back together and take it around the block for a test ride. Within a few miles same thing happens.

I found it was stuck shut because I went to check the float level on #4. #4 plug was clean, looked like it hadn't fired. The spark was good on it so I moved to the carb.

I had the carbs off a few weeks ago to install the 2 minute jet mod. I set all the float levels like in the instructions. Three of them were spot on. # 3 was high so I adjusted it.

I think I will take them back off and go through them again. Maybe some crud from the tank got in there? I also installed a new oem petcock. There is an inline fuel filter...
1999 Concours

Offline BobT_MA

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Re: Sticking float valve help
« Reply #5 on: June 13, 2016, 09:08:01 pm »
Was the needle valve sticking prior to the removal of the carbs for your 2 minute jet mod?
« Last Edit: June 13, 2016, 09:12:57 pm by BobT_MA »

Offline NJDave

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Re: Sticking float valve help
« Reply #6 on: June 13, 2016, 09:41:59 pm »
No, the floats were not sticking before I had it apart. So must have been something I did while installing the jets.
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Offline BobT_MA

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Re: Sticking float valve help
« Reply #7 on: June 13, 2016, 09:54:47 pm »
Try swapping the float and needle valve from carb 4 to another carb like number 1 and see if the problem follows or stays with carb 4.

Offline BigK

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Re: Sticking float valve help
« Reply #8 on: June 13, 2016, 10:17:29 pm »
The seat is not replacable.....it is pressed into the body. ::)


Sorry, never had to work on my C-10 carbs. I assumed they were like the older bikes I worked on were, the seat was screwed in.  :'( I could be wrong but I find it odd that the float moves freely without the bowl but sticks closed with it. I would think if it was going to stick it would stick open. Sure the float is installed properly and is not hitting something?
Kevin
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Offline MAN OF BLUES

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Re: Sticking float valve help
« Reply #9 on: June 13, 2016, 10:43:46 pm »
The seat is not replacable.....it is pressed into the body. ::)


Sorry, never had to work on my C-10 carbs. I assumed they were like the older bikes I worked on were, the seat was screwed in.  :'( I could be wrong but I find it odd that the float moves freely without the bowl but sticks closed with it. I would think if it was going to stick it would stick open. Sure the float is installed properly and is not hitting something?

Without attempting to be condescending, this is why some of us that service these specific problems, ask that those that have not, hold back on giving directions which tend to confuse, and overwhelm a person that has a problem... I mean this in a kind way, mind you, I know people wish to "help" others, but many times we have to wade thru a bunch of non productive add ins people toss out, and it does nothing to get at the real cause and solution....

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and if you are gonna call me names... it's MR. Analdweeb if you please...

Offline davida

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Re: Sticking float valve help
« Reply #10 on: June 14, 2016, 01:07:05 am »
Make sure your seats are shiny and clean

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Offline davida

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Re: Sticking float valve help
« Reply #11 on: June 14, 2016, 01:11:00 am »
It's kind of strange for a needle valve to stick closed. (open is usually what happens)  Is fuel flow good? fuel line pinched?
86 Concours no longer in a box.
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Offline NJDave

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Re: Sticking float valve help
« Reply #12 on: June 14, 2016, 01:39:01 pm »
I don't know what is going on now. Unstuck the float yesterday and went for a ride. She ran awesome... then started acting like she was running out of gas. Barley made it home. I will look deeper today... ugh. Almost wish I left the carbs alone.
1999 Concours

Offline Steve in Sunny Fla

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Re: Sticking float valve help
« Reply #13 on: June 14, 2016, 01:49:00 pm »
are you diagnosing this properly? have you checked the the gas cap not venting, and fuel starving because of vacuum in the tank? Steve
C-14 ECU flashing for performance and rideability enhancement
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Offline NJDave

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Re: Sticking float valve help
« Reply #14 on: June 14, 2016, 04:05:48 pm »
It seems I have more then one issue. Going to see if the tank is venting properly. I will go from there
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Offline NJDave

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Re: Sticking float valve help
« Reply #15 on: June 14, 2016, 07:09:48 pm »
Well, I opened the gas cap and heard a slight woosh. The bike fired up and idled perfect with the cap open. whats the best way to clear out the vent?? Compressed air?

1999 Concours

Offline Mettler1

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Re: Sticking float valve help
« Reply #16 on: June 14, 2016, 07:40:24 pm »
'94 Concours 115,000 miles-- 7th gear,2MM,KB fork brace,Over flowtubes,Stick coils,Tcro shifter,GPS,SiSF'sTorque cams,SPOOKFAK,block off plates, SS brake & clutch lines,KB risers, FENDA EXTENDA, emulators, SiSF carb Spa, Delkevic exhaust, Murphs' knee savers +grips, etc

Offline NJDave

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Re: Sticking float valve help
« Reply #17 on: June 14, 2016, 07:56:11 pm »
Thanks Mettler. I will give that a shot for the tank venting issue. One thing at a time right.
1999 Concours

Offline Steve in Sunny Fla

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Re: Sticking float valve help
« Reply #18 on: June 14, 2016, 11:27:33 pm »
Thanks Mettler. I will give that a shot for the tank venting issue. One thing at a time right.

the tank venting is you float sticking problem. Steve
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Offline DC Concours

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Re: Sticking float valve help
« Reply #19 on: June 15, 2016, 01:51:29 am »
damn! that was an easy fix.

why would a non-venting tank cause the needles sticking? The carbs are open to the atmosphere.

Offline strum

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Re: Sticking float valve help
« Reply #20 on: June 15, 2016, 09:56:48 pm »
I could stand it any longer ..lol the singing I meant, so after reading this I just ran down stairs and pulled my cap.
 I only removed the first diaphragm. Took less than ten mins.
 Ill let yall know what changes.
 
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Offline BigK

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Re: Sticking float valve help
« Reply #21 on: June 15, 2016, 11:07:27 pm »
MOB sorry to step on any toes next time I will keep my knowledge or lack there of to myself. Till all others have failed. :beerchug:
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Offline NJDave

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Re: Sticking float valve help
« Reply #22 on: June 16, 2016, 03:47:30 am »
Well, I have removed the vents from the gas cap and I have replaced the inline fuel filter that was installed... reading a little more I see the vent and filter don't always play nice. Fired up and sounded right in the garage. Test ride will have to wait until tomorrow... we shall see if all is right now.

I have to say  between the exhaust cam sprocket aND the two minute mod she is a new bike. Those mods really woke her up! Thanks Steve!
1999 Concours

Offline NJDave

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Re: Sticking float valve help
« Reply #23 on: June 16, 2016, 01:45:16 pm »
Took a ten minute ride around.  All seems well.  I'll take her to work tomorrow and see.  So far so good.  Thanks for the advice all.
1999 Concours

Offline VTconnie

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Re: Sticking float valve help
« Reply #24 on: June 16, 2016, 02:33:19 pm »
Well, I have removed the vents from the gas cap and I have replaced the inline fuel filter that was installed... reading a little more I see the vent and filter don't always play nice. Fired up and sounded right in the garage. Test ride will have to wait until tomorrow... we shall see if all is right now.

I have to say  between the exhaust cam sprocket aND the two minute mod she is a new bike. Those mods really woke her up! Thanks Steve!

Yes they sure do give an old C10 some git-up-n'-go. I wish I had the money to get the reground torque cams and the 7th gear too, but we can't have everything. That being said SISF just put together some 36mm carbs with the full spa treatment, lightweight slides, and overflows for me, and I cannot wait to get them installed.
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1980 CB900C DOHC "Old Iron" -AKA- The Hill Climber