I was so excited...after many hours of work, i was about to ride this wing for the first time. But...it started running weird...idle all over the place, bogging, and finally...nothing. I have very good spark. I just timed the bike, and set the the new tec points plate assembly that came with a free parts bike. So I pull the air cleaner lid and filter...and see fuel sitting in the plenum. The bike was running fine prior to this, even tho i didnt get to ride it, I have been starting it as I've tested things, and just to hear it run. And this issue never came up. Until today. So I let the bike run itself out of fuel. The plenum dried up. Petcock on...ignition, it fires up. As soon as it's running, i see fuel coming from one spot in the center of the plenum, and what looks to be air coming in and blowing the fuel at the same spot.
What would cause this to happen all of a sudden? I rebuilt the carbs...cleabed the tank. New fuel lines. Filter. Hoses. Pump. But i didn't change the plenum gasket, and it bit me. The weird thing is i dont see fuel leaking from *under* the carbs, only inside. The leak is between the rear two carbs.
Sudden plenum seal leak
Moderators: CYBORG, Oldewing, robin1731, Forum Moderators
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Sudden plenum seal leak
1976 gl1000
- Whiskerfish
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Re: Sudden plenum seal leak
Are you certain it is not coming out of one of the carbs? If you replaced the plenum seal and did not pinch it then odds are high the leak could be from a stuck float or float valve
"Agreement is not a requirement for Respect" CDR Michael Smith USN (Ret) 2017
"The book is wrong, this whole Conclusion is Fallacious" River Tam
2008 GL1800 IIIA "TH3DOG"
1975/6/7/8/9 Arthur Fulmer Dressed Road bike
1975 Naked Noisy and Nasty in town bike
and a whole garage full of possibilities!!
Psst. oh and by the way CHANGE YOUR BELTS!!!!
"The book is wrong, this whole Conclusion is Fallacious" River Tam
2008 GL1800 IIIA "TH3DOG"
1975/6/7/8/9 Arthur Fulmer Dressed Road bike
1975 Naked Noisy and Nasty in town bike
and a whole garage full of possibilities!!
Psst. oh and by the way CHANGE YOUR BELTS!!!!
- Oldewing
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Re: Sudden plenum seal leak
mfnheff wrote: But i didn't change the plenum gasket, and it bit me.
either or, it could be...
82 GL1100 Interstate-Oldewing October 23 BOTM
06 GL1800 Road bike, as in Rode alot...
Sometimes I wrestle with my inner demons.........
Other times we just hug.......
Team 898
Team LTD 993
Team 76 R2B3
And always remember: beer has some food value--but food has NO beer value...
06 GL1800 Road bike, as in Rode alot...
Sometimes I wrestle with my inner demons.........
Other times we just hug.......
Team 898
Team LTD 993
Team 76 R2B3
And always remember: beer has some food value--but food has NO beer value...
- ericheath
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Re: Sudden plenum seal leak
Save yourself a teardown and after clean and dry, put a piece of paper towel/ napkin in the plenum floor that will show where it gets wet first. If the carb-to-plenum orings fail they back up into the plenum. Brown paper towel that will quickly turn color to reveal the source is best. If the plenum gasket is leaking it should show without starting it up. You can also route the fuel line from the petcock so it bypasses the pump direct to the carbs.
Any carb rebuild should get a bench check of a liter of fuel hanging six feet above the rack.
Any carb rebuild should get a bench check of a liter of fuel hanging six feet above the rack.
Whatever I suggest here should be given ample time for a moderator to delicately correct. I apologize in advance.
77 WING, 1200 engine with 77 heads, cams, gl1100 foot pegs, Magna V65 front end, 764A carbs, [-gone Suzuki M109 monoshock--, replaced with gl1100 shocks] gl 1200 swing arm, gl1500 final drive, wheel and rear brakes Valkyrie seat, Meanstreak tank, Sportster pipes, Power Arc ignition off crank.
77 Wing. black
83 Wing, in pieces
"Continuing education is important even if the subject matter is fairly useless (as in this case)."---Greg Foresi
77 WING, 1200 engine with 77 heads, cams, gl1100 foot pegs, Magna V65 front end, 764A carbs, [-gone Suzuki M109 monoshock--, replaced with gl1100 shocks] gl 1200 swing arm, gl1500 final drive, wheel and rear brakes Valkyrie seat, Meanstreak tank, Sportster pipes, Power Arc ignition off crank.
77 Wing. black
83 Wing, in pieces
"Continuing education is important even if the subject matter is fairly useless (as in this case)."---Greg Foresi
- robin1731
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Re: Sudden plenum seal leak
And a new plenum seal. It isn't a complete rebuild without it. And you are so close to splitting the plenum anyway it adds very little time. IMOericheath wrote:snip...…...
Any carb rebuild should get a bench check of a liter of fuel hanging six feet above the rack.
What kits did you use? I'm guessing maybe OEM or maybe K & L? If Randakk the kit would have come with the plenum seal, that's why I'm wondering.
.
1976 Goldwing Super Sport
1985 Honda Elite
1976 KZ900 Dragbike
1992 ZX7 Dragbike (KZ900 style motor w/NOS)
and a rotation of various purchases
Randakk approved Carb Rebuilder
1985 Honda Elite
1976 KZ900 Dragbike
1992 ZX7 Dragbike (KZ900 style motor w/NOS)
and a rotation of various purchases
Randakk approved Carb Rebuilder
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Re: Sudden plenum seal leak
I'm ordering a randakk kit later today. I'm tired of playing around with junk that doesn't work. Should have done that in the first place
1976 gl1000
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Re: Sudden plenum seal leak
aah, wisdom. been there, done that. good on ya!mfnheff wrote:I'm ordering a randakk kit later today. I'm tired of playing around with junk that doesn't work. Should have done that in the first place
sorta bulldogged custom 1978 GL1000 - "geekster"
full Vetter dress 1979 GL1000 - "Barge" (currently down)
1986 1200 Aspencade - "Heart of Gold" - daily rider
1990 1500 Aspencade - It's ALIVE! but very, very naked. not in a good way.
1978 for $100 - project in worx
1978 from a previous member here - taking up space
my original '79 bought in '91 - replacing engine (eventually, maybe someday)
H2G2=42
A competent and self-confident person is incapable of jealousy in anything. Jealousy is invariably a symptom of neurotic insecurity. ~ Robert A. Heinlein
The good thing about science is that it's true whether or not you believe in it. ~ Neil deGrasse Tyson
full Vetter dress 1979 GL1000 - "Barge" (currently down)
1986 1200 Aspencade - "Heart of Gold" - daily rider
1990 1500 Aspencade - It's ALIVE! but very, very naked. not in a good way.
1978 for $100 - project in worx
1978 from a previous member here - taking up space
my original '79 bought in '91 - replacing engine (eventually, maybe someday)
H2G2=42
A competent and self-confident person is incapable of jealousy in anything. Jealousy is invariably a symptom of neurotic insecurity. ~ Robert A. Heinlein
The good thing about science is that it's true whether or not you believe in it. ~ Neil deGrasse Tyson
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