raw fuel

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handyandy64
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raw fuel

#1

Post by handyandy64 »

Hey folks, this GL1000 GW of mine likes to play games. Now it is dumping raw fuel inside air chamber. What could be the cause?
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CYBORG
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Re: raw fuel

#2

Post by CYBORG »

Could be a number of things, but float set wrong, or sticking comes to mind. I would suggest take them off and rebuild them, or send them to a qualified rebuilder
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flyday58
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Re: raw fuel

#3

Post by flyday58 »

My 76 Standard came with 1100 carbs on it, and I couldn't get the #4 float to stop sticking, flooding the plenum and then the exhaust manifold as I tried to get it running from the right side of the bike. Came around and saw the gas dripping from the manifold and quickly shut it off. I never could get it to stop and couldn't find a reason for the sticking.
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Sidecar Bob
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Re: raw fuel

#4

Post by Sidecar Bob »

If it isn't one or more stuck floats (or float valves not closing because of debris or varnish) check the carb to plenum seals.
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CNorman
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Re: raw fuel

#5

Post by CNorman »

Seems like I may have similar problems. I’m on the verge of purchasing the Master Carb kit for my ’78 GL1000. It’s in the cart, along with the Degree Timing Wheel. Thought I’d throw this out and see if anyone had ideas about what else might be the problem. I had it tuned up pretty well, running nice. Then, after mostly sitting for a while, not so good. A buddy riding with me insisted on taking the lead because he couldn’t take the exhaust fumes. Unfortunately, I have a little corrosion crack or hole in the left side exhaust just behind the driver foot peg. It literally leaks gas, at least till it gets nice and warm (a little rich, ya think?). Also, liquid gas at the end of the pipe. Had a hard time keeping it running at all. A few adjustments and now it stays running if on the side stand. When I tilt it upright, it stalls out. Any ideas?
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pidjones
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Re: raw fuel

#6

Post by pidjones »

Yep, float valves, plenum-to-carb seals (look like tall o-rings), plenum gasket. And test the rack before you reinstall it! Make up a fuel supply tank to hang above them. I use 92% isopropyl alcohol to reduce smell, fire hazard, etc. And if any is left over it will mix with gas and burn. Also, don't waste your time rebuilding without installing an inline fuel filter. Some even put one both before and after the pump.
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Hanslehoff
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Re: raw fuel

#7

Post by Hanslehoff »

I had a gas leak from the carb rack earlier this spring. Pulled the carbs off, set the float heights, cleaned everything, replaced and still leaked. Replaced the plenum to carb seals and the plenum seal and it hasn't leaked a drop since.
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Sidecar Bob
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Re: raw fuel

#8

Post by Sidecar Bob »

Yep. I had mine out and apart and checked the float heights a couple of times before I realized that it was the carb to plenum seals. The bottom of the plenum has been dry since.
Mr. Honda ('83 GL1100/Dnepr) summer How a motorcycle evolves thread
The Famous Eccles ('84 CX650EI/VeloUral) winter Never Ending Build (CX500forum)
Click: Colour schematics for all GL1000 & GL1100 and GL1200 standard models plus instructions on how to download the full size version
"A guy with two sidecars can't be all bad." - Cookie
Another guy with two sidecars..... Hmmmm... must be something to that....
CNorman
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Re: raw fuel

#9

Post by CNorman »

Sorry, guys, but I think you're over my head already. What is the carb rack? And, I don't have any gas leaking from the carbs themselves. But maybe you're saying leaking from the rack or plenum to carb seals will end up in the exhaust?
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flyin900
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Re: raw fuel

#10

Post by flyin900 »

There are a number of members who offer a rebuilding service and it maybe in your best interest to consider the service. Buying the carb kits and doing the work isn’t always the best course for a first time cleaner and rebuilder.
It can be done successfully by a novice, yet there are many who end up pulling them on and off a few times before they get them right. Removing and installing the carb bank is not something to be doing numerous times given the work required IMO.
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Sidecar Bob
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Re: raw fuel

#11

Post by Sidecar Bob »

On the other hand, you can never become experienced without doing something the first time.

It is common to refer to the assembly that includes all of the carbs and whatever framework/brackets they are attached to as a "rack". In this case these guys mean the carbs and plenum as an assembly.

There are fuel passages that run through the plenum casting from one side to the other and to each of the carbs. The plenum gasket that seals the halves of the plenum to each other has o-rings cast into it to seal the fuel passages where the halves meet and there are special carb to plenum seals that look like thick D-rings (the same seals are used in the petcock).

When a carb to plenum seal fails it lets fuel well up between the carb body and the run into the bottom of the plenum and/or into the carb throat.
Mr. Honda ('83 GL1100/Dnepr) summer How a motorcycle evolves thread
The Famous Eccles ('84 CX650EI/VeloUral) winter Never Ending Build (CX500forum)
Click: Colour schematics for all GL1000 & GL1100 and GL1200 standard models plus instructions on how to download the full size version
"A guy with two sidecars can't be all bad." - Cookie
Another guy with two sidecars..... Hmmmm... must be something to that....
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ericheath
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Re: raw fuel

#12

Post by ericheath »

CNorman, you are only one start away from bent rods. Ask me how I know.

The description from pidjones is a good start. If the PO had the carbs apart recently, you shouldn’t have much trouble with tear down. There are good write-ups on how to rebuild, but they are rather involved compared to other carbs.

Consider the time of year and whether you want to ride a lot this year or not. Sending them to a pro costs a bit, but sometimes it’s better to go to work for someone else and pay it of that way.
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robin1731
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Re: raw fuel

#13

Post by robin1731 »

ericheath wrote:snip............…. Sending them to a pro costs a bit, but sometimes it’s better to go to work for someone else and pay it of that way.

Sometimes it's cheaper to send them out to start with. ;) lolol
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Sidecar Bob
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Re: raw fuel

#14

Post by Sidecar Bob »

I guess it all depends on how mechanically inclined you are and how bad the carbs are. When I got my first bike nobody told me to be scared of working on carbs so I decided to take them apart and clean them (looking back, they probably didn't need it but I didn't know that then). The biggest problem I had was that I didn't have any way to balance them and they would hang a bit before the RPM decreased when you let the throttle off. I wouldn't exactly call myself an expert but I haven't ever had to get anyone else to work on carbs for me either.
Mr. Honda ('83 GL1100/Dnepr) summer How a motorcycle evolves thread
The Famous Eccles ('84 CX650EI/VeloUral) winter Never Ending Build (CX500forum)
Click: Colour schematics for all GL1000 & GL1100 and GL1200 standard models plus instructions on how to download the full size version
"A guy with two sidecars can't be all bad." - Cookie
Another guy with two sidecars..... Hmmmm... must be something to that....
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dontwantapickle
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Re: raw fuel

#15

Post by dontwantapickle »

Sidecar Bob wrote:I guess it all depends on how mechanically inclined you are......
true!
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