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The bike will only run when the fuel petcock is on reserve

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Fuel petcook is clogged take off and clean Rember drain gas MOPAR KENNY

Posted on May 22, 2011

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Posted on Jan 02, 2017

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Bike starts runs for a second then shuts off


I would say it's fuel supply problem. Most bike carbs have a screw in the bottom of the floatbowl to drain it. Loosen it and see if fuel runs out . If not remove the fuel hose from petcock and see if fuel runs out when you try to start the bike if it's vacuum operated petcock otherwise you have to select reserve by moving pointer to straight up. If the bike has been sitting for several months you need to drain the fuel tank, remove the petcock and clean the screens on it, remove and clean the carburetor. If the petcock has a vacuum hose connected to the back of it check it for cracks. You can always isolate a fuel problem by spraying a little fuel into the carburetor intake to see if it will run. I remove the sparkplug and prime the motor thru the sparkplug hole. If it tries to run you know you have a fuel supply problem.

May 22, 2017 | Motorcycles

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Drain fuel tank


Turn fuel petcock to off. Take off fuel line coming from petcock and use that hose, or one the same size, to run from petcock to gas container. (have paper towels or something ready because fuel left trapped in fuel line will leak out even with petcock off). With hose going in container turn petcock to normal "run" position and drain until dry - lean bike side to side to get it all. *Note - it usually drains faster with fuel cap off. Then turn petcock to "reserve" setting and do the same to get the fuel out of reserve partition in tank. Most tanks are only held on by a few bolts at rear and rubber "slide on" knobs at front, so if you remove seat and the few tank bolts you slide tank backwards and it comes off. Then you can do this draining outside / away from anything.

Jan 21, 2015 | 2008 kawasaki Vulcan 1500 Classic

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I have a 1996 XV535 virago .when I switch to reserve fuel , there is no fuel left . It is as though the fuel is draining through the reserve fuel tube in the petcock assembly all the time. There is an...


Apparently this is a common problem that I also have. Another website said that there is not a true reserve. This bike is designed to slow down the fuel pump when the reserve switch is on the "on" position and the fuel is low to give you the sense that you are running out of gas. My solution, reset the trip meter each time you get gas and make sure you fill up before reaching 100 miles.

Jan 23, 2012 | Yamaha XV 535 Virago DX Motorcycles

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1981 yamaha 650 what position should the petcok b in? pri res oo on


Fuel petcock position depends entirely on what you're doing with your bike at the time.

In normal use, the fuel petcock should be set to the "on" position and left there. In that position, gasoline will be drawn from the tank only when the engine is running and generating vacuum. This prevents overfilling the carbs when the bike sits.

When you're riding the bike and it starts to sputter, it's time to move the petcock to the "reserve" position so that you can use the last few drops in the tank (on a 650 special, this was either .3 or .5 gallons--can't remember which off the top of my head) to nurse your bike to a gas station. Once you've filled the tank, move the petcock back to "on." The bike will still run fine if you keep the petcock in the reserve position, but when it starts to run low on gas--well, you won't have that emergency reserve to get yourself to the gas station.

If you've managed to run the bike out of gas completely, or if you are getting the bike ready for service after having drained the carbs for the winter, you'll need to move the petcock to the "prime" position for a few minutes. This by-passes the vacuum line cutoff mechanism and lets gasoline flow until the carb floats shut off the fuel valve (this is also how all older motorcycle fuel petcocks operated). A sticky float or poorly sealing float valve in the carb can, however, cause far too much gasoline to drain into the carbs (and into the crankcase, if you're particularly unlucky), which is why you should not leave the petcock in the prime position for an extended period of time.

Some Yamaha XS650 motorcycles (can't tell if that's the model you have) have a tank with two fuel petcocks, one on each side, to fuel each carb. If you have a tank with this setup, be aware that setting one fuel petcock to "prime" will affect both cylinders, as there's a crossover tube to equalize fuel levels between the carbs. Also, for reasons I could never figure out, on one XS650 I owned, moving either petcock to "prime" permitted fuel to flow on a gravity feed out of both petcocks simultaneously. I could never figure out exactly why it was doing that.

Jun 06, 2011 | Yamaha XS 650 G Motorcycles

1 Answer

Stupid rookie question from an experienced HD rider: I just bought a 2001 FXD Superglide...my 4th HD in my lifetime, but new model to me. I can't see what position is what on my fuel petcock...which...


It sounds like you have an aftermarket petcock on the bike. I am not familiar with a Harley petcock that has a round knob but then maybe just the knob is an add-on. In 1996, Harley went to a vacuum operated petcock, one that gives lots of problems. I cannot tell you which way is reserve on your petcock. The only way to tell for sure is to pull the petcock out. You'll see a plastic strainer on top of the petcock. Inside the strainer, there is a tube that runs approximately half way up the strainer. Select a position on the petcock valve and blow through the petcock. When you feel the air come out of this tube, this is the "ON" postilion. Right beside this tube inside the strainer is another hole directly into the petcock. Find the position that allows for air to pass through this hole and you've found the "reserve" position. The remaining position should be "off".

Good Luck
Steve

May 12, 2011 | Harley Davidson FXD Dyna Super Glide...

1 Answer

On my 1994 fireblade which way should the fuel tap face for normal tank compared to reserve? my fuel tap is long at one end and short at the other but which end is normal for fuel?


Start with the fuel tap (called a petcock) in the horizontal position. This is pointing toward the back of the bike, and it is in the "off" position. Turning it counter-clockwise to point up is "on," and turning it clockwise to down is "reserve."

Normally, you'll want to run the bike with the petcock set to on, and save the reserve for the emergency situation when you run out of fuel.

Feb 08, 2011 | 1994 Honda CBR 900 RR Fireblade

2 Answers

Just got a trophy 3. dont know what position is which on the fuel tap? no markings.


Usually the fuel valve is this
Straight Down = ON
Straight Up = RESERVE
Horizontal/Across = OFF
There may be some difference with the manufacturers, or with custom fuel valves (chrome), also, fuel injected bikes usually do not have reserve or reserve position on fuel valve. If you have fuel injected bike, they do not like to be run out of gas, keep the gas level up.

Jun 24, 2010 | 1995 Triumph Trophy 900

1 Answer

What are the petcock positions on my 2003 bayou 250


There are three positions. Usually when the handle points to the rear of the bike the fuel is off. When the handle points down the fuel is on and will feed fuel until the reserve level is reached at which time the bike will stop running. When the lever is pointing toward the front of the bike it is on reserve and it will start and run until the bike is completely out of fuel. If you run on reserve to get to a source of fuel remember to put the lever straight down or next time you will not have a reserve. When the bike is parked the lever should always be in the off position.

Mar 19, 2010 | 2003 kawasaki KX 250

2 Answers

Where is the reserve tank


Is your bike fuel injected or carbureted? If it is fuel injected the tank has a 4.5 gallon tank and that's it. If it is carbureted the fuel petcock is a three position valve (ON, OFF, RES), the valve is configured in the tank where ON allows fuel to flow until you are down to about 1/2 a gallon at which time you would turn the petcock to RES which allows the engine to use the last 1/2 gallon of fuel and gives you time to hunt down a gas station.

There is no separate "reserve" fuel tank.

Sep 16, 2009 | 2000 Suzuki GSX-R 600

1 Answer

HD 1979 fatboy fuel petcock valve leaking


Replace the petcock. The rubber diaphragm is ruptured. I'd also bet your fuel mileage dropped cause the ruptured diaphragm is allowing raw fuel to be sucked into the intake manifold.

Jul 02, 2009 | 1979 Harley Davidson XLS 1000

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