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Experts,

Interesting one here....everything was working fine with the bike with no carb leaks when I was using Regular gas, but I switched to no Ethanol gas as the bike does tend to sit for some time. After the switch, there is a slight leak coming from the bottom of the carb...about 1 drip every 10 seconds. Not from the overflow, but from that small valve area. Has anyone seen this before? Is it related to the gas? That is the only thing that I changed....scratching my head here.
 

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Experts,
there is a slight leak coming from the bottom of the carb...about 1 drip every 10 seconds. Not from the overflow, but from that small valve area.
If only one carb is leaking it is likely not due to the change of fuel.
By small valve area are you referring to the air correction valve (ACV)?
 

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'84 CX650E that is evolving into a GL500
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Yeah, a bit of clarification about what you mean by "that small valve area" might help us understand what is going on.

USE ONLY NON-ETHANOL FUEL WHENEVER POSSIBLE
Why do people feel the need to jump in and post this sort of absolute garbage? Fuel without ethanol is nearly impossible to find here so all the fuel I have used in the last 25 years or so has been E10 and it has not caused any problems.

Before you spread this mythinformation again you need to read this
 

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1978 CX500 "The Grub", 1983 GL650I "Nimbus"
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I can see this being related to the fuel change only if ethanol swells rubber parts. Is that the case?
 

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1982 Honda GL500 2002 BMW R1150R
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Yeah, a bit of clarification about what you mean by "that small valve area" might help us understand what is going on.


Why do people feel the need to jump in and post this sort of absolute garbage? Fuel without ethanol is nearly impossible to find here so all the fuel I have used in the last 25 years or so has been E10 and it has not caused any problems.

Before you spread this mythinformation again you need to read this
Ethanol free fuel is available in marinas and small airports. Ethanol is really bad for engines. There is a reason why Diesel engines last so long and gas engines don't. Looks like pretty soon I'll be running my BMW on Holzgas anyways the way things are going.
 

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I run the cheap gas and the bike runs great on it. I used to only run super unleaded and would use non ethanol when available. I later read somewhere on this forum that our bikes run better on lower octane fuel so I gave it a try while thinking there was no way this was true. To my surprise the bike did run better and have run the cheap stuff ever since. I still run non ethanol at the end of Fall so I won’t have to worry about winterizing with ethanol in the tank.
 

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'84 CX650E that is evolving into a GL500
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I just did a quick search and found something that says Buna-N (IIRC the rubber most commonly used) has low swell when exposed to ethanol.
I didn't look for corroborating references but it sounds right to me.

On the other hand, any swell might plug a leak.
 

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Ethanol free fuel is available in marinas and small airports. Ethanol is really bad for engines. There is a reason why Diesel engines last so long and gas engines don't. Looks like pretty soon I'll be running my BMW on Holzgas anyways the way things are going.
I run ethanol fuel in my 1994 Dodge Ram with the V10 in it and that truck has 349,000 miles on it. It still runs strong and burns no oil. I agree that ethanol has a shorter shelf life and hurts an engine’s fuel economy but it doesn’t seem to actually hurt the motor.
 

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I run ethanol fuel in my 1994 Dodge Ram with the V10 in it and that truck has 349,000 miles on it. It still runs strong and burns no oil. I agree that ethanol has a shorter shelf life and hurts an engine’s fuel economy but it doesn’t seem to actually hurt the motor.
It's much less a problem in large engines than small engines. I run my cars and truck on regular gas, my lawnmowers, motorcycles, weedwhackers and outboards all get the ethanol-free gas.
 

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1978 CX500 "The Grub", 1983 GL650I "Nimbus"
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Diesel engines last longer because they burn OIL, not because the fuel lacks ethanol.
My only beef with corn beer fuel (aside from all the lies about its benefits) is its poor storage life. If I'm on a longer ride where I'll burn through the tank quickly, E10 is fine. All my small engines that run infrequently get E0. And with two bikes in a weekly rotation, they get E0, too.
 

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There is a fairly long list of technical reasons. Ethanol is an aggressive solvent and will attack rubber-type fuel system components, such as fuel bladders, fuel lines, composite floats and rubber-tipped needle valves, etc. This can lead to fuel starvation, flooding and leaks.

Don't trust it in an airplane don't trust it in my bike. Case closed, the FAA already settled this.
 

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It's much less a problem in large engines than small engines. I run my cars and truck on regular gas, my lawnmowers, motorcycles, weedwhackers and outboards all get the ethanol-free gas.
Engine size doesn’t really have anything to do with it. How long it sits between uses is the bigger factor. Carbureted engines suffer more because of the small amount of fuel that sits in the float bowl. It doesn’t take long for the good stuff to evaporate leaving the bad stuff behind. Fuel injection doesn’t have this problem.
 

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Engine size doesn’t really have anything to do with it. How long it sits between uses is the bigger factor. Carbureted engines suffer more because of the small amount of fuel that sits in the float bowl. It doesn’t take long for the good stuff to evaporate leaving the bad stuff behind. Fuel injection doesn’t have this problem.
I'm reading more on the subject, looks like ethanol fuel's problems are mostly that it doesn't store well.
 

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'84 CX650E that is evolving into a GL500
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There are no marinas or airports close enough to be worth getting fuel from.

Did you read the article I linked to? It was written by a very experienced Honda mechanic and carb specialist and explains that the ethanol is NOT the cause of most of the issues attributed to it.
 

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There are no marinas or airports close enough to be worth getting fuel from.

Did you read the article I linked to? It was written by a very experienced Honda mechanic and carb specialist and explains that the ethanol is NOT the cause of most of the issues attributed to it.
I read the article and I stand corrected. Fair enough?
 
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