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Discussion Starter #1
How does the reserve gas work on an atv or m/c? i know you flip a switch of knob to change on/off/res but how does it work? i know the off/on part is just that, closes off the line stopping flow.
 

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The petcock valve has a tube that sticks up inside the gas tank. When the valve is in the "on" position, it takes fuel through the top part of the tube. When the valve is in the "reserve" position, it takes fuel from the bottom of the tube. So if you have it in the "on" position, once the fuel gets down below the top of the tube, it will run out of fuel. Then, you turn the valve to the "reserve" position and finish running the fuel out of the tank. This is why it's important to turn the valve back to the "on" position after you refill the tank. If you don't it will run all the fuel out and you won't have any in the "reserve" position when you run out.
 

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Usually there is a tube that reaches up into the tank from the petcock,and it is the main fuel supply,once it gets below the top of that tube,you basically run out of gas even though there is gas BELOW the opening in that tube..The gas below the opening in the top of that tube is your reserve fuel,and once you turn the petcock to reserve,it rotates the flow opening made into the lever to line up with the hole in the bottom of the tank,and you are then on reserve,plus whatever is sitting in the bottom of the tank,water is heavier than gas,as is sand,mud so it is best to not run out of gas on the main tank,as the reserve can,and has been known to contain all the nasty carb clogging crud,and h20...
 

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Here is a picture of a Yamaha petcock valve. Yamaha's have two tubes. When the valve is in the "on" position, it takes the fuel from the big tube. When the valve is in the "reserve" position, it takes the fuel from the short tube. I just posted the picture of the Yamaha petcock valve because it's easier to see how it works.



Honda petcock valves only have one tube, but it still works in the same way. It takes fuel from the top when in the "on" position and fuel from the bottom when in the "reserve" position. Here is a Honda petcock valve.

 

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Discussion Starter #5
ok i was wondering, a guy at work has an 02 recon and was out riding and it quit on him way out in the woods. looked in tank and saw gas and was like WTFlip, dinked with it for a while, then changed it to reserve and wammo, it started. that got me to wondering how it works.
 

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Discussion Starter #6
thanks for the picture.
 

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You're welcome.
 

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I get the discussion above. Somewhere I thought I read that in order to make sure there's gas in the reserve you need to have the switch in a certain position when adding fuel. Is that really true. Doesn't make sense since it's just one tank.
 

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ok i was wondering, a guy at work has an 02 recon and was out riding and it quit on him way out in the woods. looked in tank and saw gas and was like WTFlip, dinked with it for a while, then changed it to reserve and wammo, it started. that got me to wondering how it works.
you run out of gas;; so you switch it to reserve.. that gives you a few miles, or so. reserve, before ya become stranded.. now ya got time to fill the tank.. when ya run out the reserve, its a pain in the bass to get restarted.. been there, done it.. i cant remember how many miles you can put on the honda.
i dont advise going down hill, when ya get low on gas, because it will starve the carburetor.. on the es, it was pointing down enough, i couldnt rock the 2000 enough, to put it in neutral. lucky for me i carry rope. 1/4 ".. i put it in betwixt two trees, an run it through the back rack. then wound it, with a a piece of wood from a tree, like you would do a rubber band.. when it took the tension off the gears, i chalked, put it in neutral, took the rope off, and rocked it enough, to go over the chalk's..
this story has a moral.;; dont be going downhill when the gas gets low, and ya have to use reserve. make sure you can coast to a flat spot.. dont run out of gas in the first place.. be prepared. :D:oops::rolleyes:o_O:D
 

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Ill stand corrected but I beleive your reserve fuel position gives you 2 litres of fuel. You do not need to have the fuel tap in a set position to gain this reservation. ON is ON, OFF is OFF, RES is RES. It's that simple
 

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ok i was wondering, a guy at work has an 02 recon and was out riding and it quit on him way out in the woods. looked in tank and saw gas and was like WTFlip, dinked with it for a while, then changed it to reserve and wammo, it started. that got me to wondering how it works.
the petcock is old alien tech recovered from an Area 51 crash...forget what these guys are telling you..when you flip the lever the bike is able to actually pull amonia from the atmosphere left behind by urine from deer and other animals and it condenses it in the carb intake bowl section. it then uses the photosynthesis from the light providede by the spark plug igniting to generate amonianoxide. The process can continue usually for up to about 10 miles of running before the chemical reaction simply overwhelms itself and the gases are exhausted. We're not sure why this reaction fails after a point but assume this is what happened to the alilen ship, hence the crash in the desert....anyway...good riding..stay safe, and always remember, if you have to stop a take a leak in the woods during a ride, well, you might just be helping to proide the reserve fuel some other rider will need to make it home ! ET
 

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good story..,, but why tell the truth!!
 
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