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Technical Help Forum
Started by barnfindcx at 03-07-2010 2:46 PM. Topic has 18 replies.
  
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 03-07-2010, 2:46 PM
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barnfindcx
 
Joined on 03-07-2010
chippewa falls WI
Posts 12
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ok I just got this beast going and there is a brass nipple just under the float on the right carb if I am looking at it from the left side. WHAT IS THIS FOR? leaking all over and making me mad! I want to go ride this beast again!
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03-07-2010, 3:34 PM
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kingston73
Joined on 04-19-2008
Bellingham, MA
Posts 1,722
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Are you talking about the drain tube? The flat head screw on the side of the carb at the bottom is for draining the float bowls, if that's what you are talking about maybe its just unscrewed?
1979 cx500D - mostly stock
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03-07-2010, 3:42 PM
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barnfindcx
Joined on 03-07-2010
chippewa falls WI
Posts 12
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well it looks like a brass nipple higher up on the slide
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03-07-2010, 3:49 PM
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Marty J.
Joined on 01-17-2008
Hammel, Denmark
Posts 158
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Hi barnfind
It's the overflow outlet. It originally had a thin black rubber hose on it to direct overflowing fuel out of harm's way and out under the bike.
Your problem is the float valve needle is not closing/sealing properly, allowing the float bowl to overfill.
If you are lucky, turning off the petcock, draining the float bowl (screw next to the brass nipple) then refilling the float bowl while tapping the right-hand carb with a screwdriver handle will flush out any foreign body that is keeping the float valve needle from seating. You might have to try this a few times before the problem is fixed permanently.
If you are unlucky you will have to remove the carbs to clean and check the floats, float bowl and float needle valves. A speck of dirt or rust on the float valve needle or its seat will prevent it from closing properly. Check that there is no fuel in the float (that would indicate a leaking float).
Whatever you do, fit an inline fuel filter between the fuelcock and the carbs. Oh, and keep the bike away from open flames, sparks etc. unless you are well insured ;o)
Marty
'81 CX500A, '85 CX650E
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03-07-2010, 3:54 PM
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kingston73
Joined on 04-19-2008
Bellingham, MA
Posts 1,722
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If you haven't looked at it yet, take a look through the "quick reference" thread Stitch made, and look at Shep's site as well:
http://globalcxglvtwins.hostingdelivered.com/viewtopic.php?f=19&t=32
1979 cx500D - mostly stock
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03-07-2010, 4:06 PM
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barnfindcx
Joined on 03-07-2010
chippewa falls WI
Posts 12
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hey thats probobly right I shouldnt have just put gas in it and ran it... I will do a bit of maintenance and let you fellars know whats up! thanks for all the input! Iam sure I will be asking many more stupid questions for the next few weeks! time for dinner!
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03-07-2010, 4:43 PM
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Sams GL 650
Joined on 02-17-2010
Annville PA (USA)
Posts 191
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If its the float valve the good news is they're available and inexpensive, if needed. sam
Bikes: 2002 Kawasaki Vulcan
1983 Honda GL 650
1 st Bike Honda CL 175 (1974)
Age 52
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03-07-2010, 5:08 PM
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barnfindcx
Joined on 03-07-2010
chippewa falls WI
Posts 12
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thanks sam I think Iwill take off those darn carbs
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03-07-2010, 7:32 PM
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JackHammer
Joined on 07-23-2009
Sicamous B.C.Canada
Posts 96
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I just had the same problem awhile back with my bike. it may not be the float valve. Take the float bowl off and pour some fuel into it. If it leaks fuel from the bottom,then the overflow tube in the float bowl is leaking. Mine had a fine vertical crack in it,barely visible,but leaked fuel. I repaired it with solder,making sure I didnt fill the tube with solder ,so it still served its purpose. If float valve doesnt seat properly.the bowl will overfill,what the tube does is drain excess fuel,so it doesnt go into the crankcase. I,m thinking the tube is cracked and leaking in the float bowl.Hope this helps out,dont want you to mess with the floats and float valve if not necessary. I did,changed float,seat,valve and it still leaked,solved my problem from a tip on this site.
1980CX500 Custom,
2002 Honda Sabre 1100
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03-07-2010, 7:36 PM
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barnfindcx
Joined on 03-07-2010
chippewa falls WI
Posts 12
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huh well what do I do take the carbs off anyways to fix I would assume?
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03-07-2010, 7:39 PM
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JackHammer
Joined on 07-23-2009
Sicamous B.C.Canada
Posts 96
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One more thing,you dont have to pull your carbs out to do this test,bowls can be removed with carbs in bike,just shut fuel supply off.
1980CX500 Custom,
2002 Honda Sabre 1100
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03-07-2010, 7:44 PM
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JackHammer
Joined on 07-23-2009
Sicamous B.C.Canada
Posts 96
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When you remove the float bowl(three screws),you will see a brass tube inside it. This is the tube that may be leaking on you.Pour fuel into the bowl,but not over the top of the tube. If fuel leaks out the bottom,then this tube is leaking . Can be repaired by soldering the tube,worked for me.
1980CX500 Custom,
2002 Honda Sabre 1100
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03-07-2010, 8:54 PM
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barnfindcx
Joined on 03-07-2010
chippewa falls WI
Posts 12
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just went out to the shop and the fuel is off but still leaking on the floor, put a bucket under it, but damn it stinks out there now... wife isnt happy with my mess. should have kept it in the shed for another seven years!
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03-08-2010, 1:53 PM
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Marty J.
Joined on 01-17-2008
Hammel, Denmark
Posts 158
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Did you try tapping the RH carb? Try that first, it's free and takes 2 seconds.
Try the other stuff if tapping doesn't work. If it works, clean out the float bowls when you have half an hour to spare. The bit of crud you just dislodged is in the RH one, probably along with a whole lot of other crap in both bowls.
Marty
'81 CX500A, '85 CX650E
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03-13-2010, 1:39 PM
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broncofan
Joined on 07-14-2009
Omaha, NE
Posts 13
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I think I am having the same problem. Gas is leaking from up in-between the carbs I think. After I try to start the bike and get it firing, this leak is extremely prominent. Then the black tube that drains from the bottom of the left carb streams gas out of it. Will this tapping trick work? and how do I refill the float bowls after I drain them? sorry, I'm a noob
1982 Honda GL500
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03-13-2010, 2:06 PM
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Shep
Joined on 01-30-2007
UK.2x1980CX500A
Posts 7,638
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 broncofan wrote: | | I think I am having the same problem. Gas is leaking from up in-between the carbs I think. After I try to start the bike and get it firing, this leak is extremely prominent. Then the black tube that drains from the bottom of the left carb streams gas out of it. Will this tapping trick work? and how do I refill the float bowls after I drain them? sorry, I'm a noob |
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You may get lucky.Switch the fuel tap off.Each carb has a drain screw on the side.The left hand side one is easy to get to but the inner/right hand side is a bit mire tricky and needs a good long necked screwdriver.If you undo then out a ways they should allow the fuel out(Place a bowl under the carbs first).
Then screw them back up,switch on petcock and the bowls should re-fill.If you have trouble starting the bike as the fuel hasn't been drawn through just spray a volatile Aerosol like Carb/Brake cleaner/WD40 or even Hairspray into the Carbs via the Air filter housing but with the Air filter out if possible.Then take the bike for a good hard 10 minute ride and see if the overflow stops.It's usually caused by badly seating Float needle valves or incorrect float heights,
http://globalcxglvtwins.hostingdelivered.com/viewtopic.php?f=19&t=110
You may get lucky and not have to strip the carbs.Also you can try some,"Seafoam" in the Gas/Petrol.Than can soemtimes help.
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Id quot circumiret, circumveniat
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03-13-2010, 3:13 PM
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broncofan
Joined on 07-14-2009
Omaha, NE
Posts 13
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Thanks so much for the help!! I did what you said, minus the ride. I unscrewed, drained, retightened, and filled 'em back up. Then I started the bike, and no leak from in-between the carbs! After running for 5 minutes, however, fuel started dripping pretty good out of the LH side drain black drain tube. What could be the problem now??
1982 Honda GL500
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03-14-2010, 1:08 AM
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Shep
Joined on 01-30-2007
UK.2x1980CX500A
Posts 7,638
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| broncofan wrote: | | Thanks so much for the help!! I did what you said, minus the ride. I unscrewed, drained, retightened, and filled 'em back up. Then I started the bike, and no leak from in-between the carbs! After running for 5 minutes, however, fuel started dripping pretty good out of the LH side drain black drain tube. What could be the problem now?? |
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You may have to take the carbs off and clean and reseat the Float needle valves and reset the floats.If you are not confident to do this see if there's some one off the forum to close enough to help.Also still go for a good ride but tap the side of the carb with a small hammer several times again but not enough to dent/damage them before doing so.Sometimes getting a good amount of fuel through the system cam clear it.
My Music
http://www.reverbnation.com/pauldouglas/
Join Just In Case :)
http://globalcxglvtwins.hostingdelivered.com/
Id quot circumiret, circumveniat
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03-15-2010, 8:24 PM
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muleskinner
Joined on 03-16-2010
Marion, Ohio
Posts 131
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Did you try what jackhammer wrote about a few posts back? I just bought a 78, 500 cx 2 days ago and mine was doing the same thing yours is. A buddy and I took the carbs off expecting to find a stuck float, or needle valve but after all the work taking everything apart it turned out to be that small over flow tube was indeed split down the side. When you have this problem the gas just leaks out of the bowel before it even reaches the float. It works in the same way a toilet works really. Like jackhammer said, it's an easy fix. just remove the 3 screws in the bowel, you will see the over flow tube sticking up from the bottom of the bowel. Pour some gas or water into the bowel and see if it leaks. If so, you could do like some have and do a bit of soldering on the crack and that should fix you up. I work in a tooling shop so I just pulled my cracked tube out and made me a new one. Any way it's worth checking out because it would be a whole lot easier than taking the carbs out to find that this is your problem. Hope this helps ya.
1978 Honda CX500 24,761 miles. My fist bike.
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Honda CX500 & G... » CX500 GL500 Tra... » Technical Help ... » carburator leaking
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