Severe fuel leak from somewhere behind and below #1&3 carbs?
98valk:
Quote from: Joe333x on October 05, 2024, 08:53:40 AM
Quote from: Challenger on October 05, 2024, 07:00:43 AM
Scientific study or not, the fuel rail packing I've replaced were cracked or even crumbling. Doesn't matter why, they needed replaced. Sometimes $hit just happens.
Yeah theres only one member on this board that continues to give terrible advice about these 20+ year old o rings. I rebuilt all six of my carbs and replaced every o ring after they started leaking soon after I purchased my bike last year. Last thing I want to fool around with is gas leaking. Most if not all the o rings were flat, dry and broke easily. Even tires have an expiration date, they get dry rot and crack because rubber does not last forever, then you add ethanol to the mix. I cation anyone with a fuel leak to not take poor advice and try cheap fixes, if you're leaking fuel, rebuild your carbs and replace the o rings. I posted videos on youtube for anyone that wants to do it themselves. I understand the want to try and save time and money with cheap fixes but once you start leaking the o rings will not repair them selves no matter what magic you try, just replace them and you'll be good for another 20+ years.
https://youtu.be/tx3AnNUVahI
https://youtu.be/qiY2pCfTwMw
sorry but u and others spread incorrect info that there is a life span of installed buna-n o-rings and that ethanol degrades them. all false info. the fuel additives people use like seafoam slowly degrades them. Honda BUNA-N is designed for 10% ethanol. Ethanol DOES NOT degrade them. I post engineering facts about buna-n and not my opinions. There isn't a life span for any installed o-rings unless they are subjected to conditions that are known to degrade them, for buna-n 10% Ethanol is not one of them.
my scoot never used seafoam or B12 except maybe one time, when I first brought it and then did some research, owned it since new for 24 yrs now zero leaks except when the carb thru bolts loosened up. tightened them, then zero leaks for 10s of thousands of miles.
many many over the yrs on here have stated they use seafoam, B12, Lucas every tank and then many many have to have their carbs rebuilt.
The OP message me and stated the nuts of the thru bolts were loose, he tightened them and now it doesn't leak. He also stated he has over 200k miles on his scoot and first time the carbs ever leaked.
Enjoy.
rug_burn:
No, 98valk, o-rings do not last forever, let's put that fairy tale to bed.
They get cooked by heat, the plasticizer leeches out of the rubber, and ozone has its way with them. Also shemicals in the fuel
Just take off an intake tube off your 98 Valk, now 26 years old and the o-ring, and even moreso the nitrile seal sleeve at the top, will be some rock-hard ceramic-like material where once they were rubber.
Nitrile o-rings only have a 15 year shelf life (from the Parker Hannifin Corp), and I believe it's 10 years for aviation applications.
Parker recommends a Viton compound (V0834-70) for gasoline with 5%-20% alcohol, BTW, not nitrile.
Nothing lasts forever, Grasshopper... (sad)
Joe333x:
Quote from: 98valk on October 05, 2024, 12:22:42 PM
Quote from: Joe333x on October 05, 2024, 08:53:40 AM
Quote from: Challenger on October 05, 2024, 07:00:43 AM
Scientific study or not, the fuel rail packing I've replaced were cracked or even crumbling. Doesn't matter why, they needed replaced. Sometimes $hit just happens.
Yeah theres only one member on this board that continues to give terrible advice about these 20+ year old o rings. I rebuilt all six of my carbs and replaced every o ring after they started leaking soon after I purchased my bike last year. Last thing I want to fool around with is gas leaking. Most if not all the o rings were flat, dry and broke easily. Even tires have an expiration date, they get dry rot and crack because rubber does not last forever, then you add ethanol to the mix. I cation anyone with a fuel leak to not take poor advice and try cheap fixes, if you're leaking fuel, rebuild your carbs and replace the o rings. I posted videos on youtube for anyone that wants to do it themselves. I understand the want to try and save time and money with cheap fixes but once you start leaking the o rings will not repair them selves no matter what magic you try, just replace them and you'll be good for another 20+ years.
https://youtu.be/tx3AnNUVahI
https://youtu.be/qiY2pCfTwMw
sorry but u and others spread incorrect info that there is a life span of installed buna-n o-rings and that ethanol degrades them. all false info. the fuel additives people use like seafoam slowly degrades them. Honda BUNA-N is designed for 10% ethanol. Ethanol DOES NOT degrade them. I post engineering facts about buna-n and not my opinions. There isn't a life span for any installed o-rings unless they are subjected to conditions that are known to degrade them, for buna-n 10% Ethanol is not one of them.
my scoot never used seafoam or B12 except maybe one time, when I first brought it and then did some research, owned it since new for 24 yrs now zero leaks except when the carb thru bolts loosened up. tightened them, then zero leaks for 10s of thousands of miles.
many many over the yrs on here have stated they use seafoam, B12, Lucas every tank and then many many have to have their carbs rebuilt.
The OP message me and stated the nuts of the thru bolts were loose, he tightened them and now it doesn't leak. He also stated he has over 200k miles on his scoot and first time the carbs ever leaked.
Enjoy.
Mileage has nothing to do with it, actually the higher the mileage the less of concern because fuel wasn't sitting long in the carbs as a lower mileage bike. You're on an island though with thinking tightening the bolts is a real fix. It's just a bandaid. If you think about it this way if you take a pipe and put it in a tube and the pipe has a rubber ring around it that stops anything from getting through it doesn't matter how far it is in the tube as long as the rubber ring is around it and in so unless the fuel rail o-ring is sticking out of the hole it goes in then it shouldn't be leaking the tube on the carb that the fuel rail goes into is not tapered.
98valk:
Quote from: rug_burn on October 05, 2024, 03:27:50 PM
No, 98valk, o-rings do not last forever, let's put that fairy tale to bed.
They get cooked by heat, the plasticizer leeches out of the rubber, and ozone has its way with them. Also shemicals in the fuel
Just take off an intake tube off your 98 Valk, now 26 years old and the o-ring, and even moreso the nitrile seal sleeve at the top, will be some rock-hard ceramic-like material where once they were rubber.
Nitrile o-rings only have a 15 year shelf life (from the Parker Hannifin Corp), and I believe it's 10 years for aviation applications.
Parker recommends a Viton compound (V0834-70) for gasoline with 5%-20% alcohol, BTW, not nitrile.
Nothing lasts forever, Grasshopper... (sad)
not a fairy tale. O-Rings, pipe gaskets, etc., do last forever if they are not subjected to conditions for which they are not designed for.
buna-n o-rings are rated to consistent 257F operating temp. I never looked up the highest intermittent temp they can operate at.
Who's valkyrie is running at that temp TO HEAT COOK THE O-RINGs??
The o-rings are installed inside of the carbs and are not exposed to ozone and sunlight.
Buna-n is designed for the ethanol fuel and the other chemicals in it. Anybody can read that on various buna-n material compatible websites.
viton has the higher temp and higher ethanol % over buna-n. I read before buna-n is good up to 15%
""Buna o-rings:
Excellent resistance to petroleum-based oils and fuels, silicone greases, hydraulic fluids, water and alcohols
Low compression set
High tensile strength
Abrasion resistance
Superior performance in ethanol/methanol blended gasoline
Viton® o-rings:
High temperature resistance
Outstanding chemical resistance
Low compression set
Ozone resistant
Low outgassing""
https://www.applerubber.com/blog/how-to-make-the-right-choice-between-viton-and-buna-o-rings/
Again! and Again!, Shelf life HAS ZERO TO DO WITH OPERATIONAL/SERVICE LIFE! PERIOD!!
SERVICE LIFE IS ALWAYS DETERMINED BY THE CONTROLLED OPERATIONAL ENVIRONMENT OF THE INSTALLED O-RINGS! ASK ANY MAINTENANCE ENGINEER, THEY WILL SAY THE SAME. A SERVICE LIFE IS DETERMINED BY CONTROLLED TESTING OF THE O-RING IN OPERATION. PERIOD!!
Challenger:
Give it a rest. Many people have had to replace fuel rail o- rings due to being cracked and brittle. Obviously not for ever. Most of us have no idea what the previous owners of 20 to 25 year old bikes have put in their fuel tanks or how long they have set and it doesn't matter because we still had to replace them . Ricky-D used to rag on about bearings are for ever also, yet many have had left rear brgs disintegrate . We replace damaged or worn part and ride on.
No disrespect intended,
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