Question about 1990 Suzuki GS 500 E

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If i take my gs500 on a long ride the bike begins to sputter and cut out on me. I recently shimmed the carb needles and replaced the petcock valve but that did not fix it. I have had my bike in the shop multiple times now and they cannot seem to find a problem but there is obviously something wrong. What could be causing the problem?

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Maybe the tank's not properly time you go out, take a plug spanner to check for a spark when the bike conks out..had a similar prob on my vfr, turned out the reg/rec was overheating so I repositioned it externally

Posted on Mar 09, 2010

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Make sure you check the tank mounted petcock - a common problem on the older models - it can lead to these problems and can be overlooked by someone not familiar with these bikes

Posted on Jan 13, 2010

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Could be the coils or CDI. Also if it is not charging the battery enough the CDI does not have enough juice to keep it running.

Posted on Sep 29, 2009

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04 Harley xL883C Won't start after replacing petcock

Your comment about it running only as long as you're spraying carb cleaner into it tells me that the gas isn't getting to the carb.

Pull the fuel line off at the carb, turn on the petcock, and see if gas flows (use a cup to catch the gas).

If no gas flow, you'll know the problem is somewhere between the ga tank and the carb.

Plugged inline fuel filter?
Plugged fuel line?
Bad petcock?

Mar 13, 2014 | 2004 Harley Davidson XL 883C Sportster...

2 Answers

2005 Harley Sportster 1200 Custom stalls at highway speeds

The diaphragm petcock operates by vacuum.
Sometimes, the vacuum line comes unhooked, cracked or broken.

Check the vacuum line.

Also, the diaphragm petcock sometimes dies, and needs replacing.

The reserve DOESN'T operate by vacuum.

Feb 12, 2014 | 2005 Harley Davidson XL 1200 C Sportster...

3 Answers

94 gs500e suzuki starts and runs fine for about 15-20 mins then will stall and cut off while im driven like it has no gas. Then after 25 mins it will start back up and ride fine for awhile. any answers

The fuel petcock may be the problem. It works by opening a valve to let gas reach the carbs. It does this using a vacuum diaphragm drawing vacuum from the carbs. A gs500 will not work very well without an airfilter either. The carbs rely on proper vacuum to operate and a poor or no air filter will make a gs500 run very bad. Gs500s are air cooled also. If none of this solves the problem do a major tune up. Still nothing then take it to a mechanic. Taking shots in the dark gets expensive.

Aug 21, 2011 | 1990 Suzuki GS 500 E

1 Answer

Gas runs out of yhe over flow tube on the carb after it sits nawhile after riding. Harley 883 sportster. 1200cc

You didn't say what year modle bike you have but you probably have more than one problem. The first problem is in the carb. The needle is not seating properly in it's seat in the carb. The needle and seat shuts off the fuel to the float bowl once it's full. Ths could be because of wear or you might have a bit of trash in the needle and seat. The second problem is that since 1996, Harley has been installing vacuum operated fuel petcocks on the bikes. Fuel should be shut off if the bike is not running. Either the petcock has been changed out and a manually operated petcock has been installed or the needle in the petcock is not turning the fuel off. You'll have to remove the petcock from the tank and disassemble it to check the condition of the needle in the petcock. Take the rear plate off the petcock to access the needle and the diaphragm that operates it. Check the diaphragm for holes.

Good Luck

Jul 17, 2011 | Harley Davidson GT 500 Cafe Racer...

1 Answer

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

My 04 fxdwg recently started sputtering and stalling out. acts as if she's run out of gas but i just filled the tank. starts up again immediately and then does it again.

I'll bet you've got that vacuum operated petcock on your bike too. Not saying this is the problem but I've seen more problems with them than I care to mention. They're only on carburetur equipped bikes. You didn't say which you had but if you've got one, I'd check it out.

You can drain the tank and remove the petcock. Check the condition of the screen filter that is in the tank. On the backside of the petcock, the should be a small vacuum hose connected to the petcock. Take this hose and the fuel hose loose. On the backside of the petcock is square plate held on by four screws. Remove the screws and lift the plate. There is a diaphragm, a small spring, and a needle in there. Take the needle out and use compressed air to blow everything out, Rotate the fuel selector lever and make sure both the on and reserve position is clear in the petcock. Now, hold the diaphragm up to the light and stretch is slightly. Look for holes. If you find a hole, replace the diaghragm. If not, reassemble the petcock.

The vaccum hose that supplies vacuum to the petcock is very small. It comes off a large hose that supplies vacuum to the VOES switch under the top tube of the frame. The vacuum is supplied by a nipple on the backside of the carburetor. Check this hose for cracks or being unplugged.

What I suggest is that you replace the petcock with a high quality manually operated petcock. I like the Pingle petcocks. They're expensive but well worth the money. You'll have to get into the habit of turning your fuel off when you stop the bike like the "old school bikers" do. Just a precaution in the event a piece of trash gets in the needle and seat of your carb.

Now, there are other things that could be causing this. A bad gas cap for one. If the vent in your gas cap is bad, a vacuum will build up in the tank and starve the carb for fuel. you can test it in either of two ways. Loosen the cap (don't take it all the way off) and ride the bike. If the problem goes away, buy a new gas cap. Or, the shop method of testing them when you don't have time to ride the bike. Take the cap off, wipe off as much gasoline as you can, stick the threaded part in your mouth and **** and blow on it. If you can **** air and blow air through the cap, it's fine. Now, go find the Scope mouthwash or everyone will call you "Gasoline Breath" for the rest of the day.

If your bike is fuel injected, you might want to check the electric fuel pump. Other than that, I can't help you with the fuel injection. I know nothing about it as Harley is very secretive about that.

Good Luck

May 28, 2010 | 2004 Harley Davidson FXDWG - FXDWGI Dyna...

3 Answers

Petrol in my engine oil chamber why

If you're getting fuel into your oil, your fuel delivery system is leaking. This problem is most common on carburated engines. The needle valve is not seating properly and when the engine is stopped, the carburator is flooding and the fuel is flowing into the engine. Once it gets into intake manifold, it seeps past the valves into the cylinder. Then it seeps past the rings into the crankcase contaminating the oil. If your bike is fuel injected, the same thing is happening because the fuel is pressurized by the fuel pump and your injector(s) are leaking fuel into the engine.

On a carb equipped machine there us usually a petcock to turn the fuel off with. You can either turn the petcock off each time you turn the bike off (a good practice) or you can have the carburator repaired. Some late model bikes have a vacuum operated petcock that automatically turns the fuel off when the engine is stopped. If your bike is equipped with this type of petcock, the petcock could be defective or is positioned in the "prime" position. If you go into the carbs (I think your bike has two carbs), replace the needle and check the float height setting according to the manual in both carbs.

If your bike is fuel injected, these devices are usually not easily servicable, simply replaced if they malfunction. You could try adding a bit of fuel injector cleaner designed for automotive use to your fuel. It may clean the injector (or needle in the case of carburators) and solve the problem. Otherwise, I'd probably take the bike to a repair shop.

Good Luck!

Oct 19, 2009 | Honda VTR 1000 F Firestorm Motorcycles

1 Answer

I have fuel in crank case in 1996 road king .took off cam cap and oil and gas came out. gasket was leaking. also gas and oil coming out of carbruator.

Usually when you find gasoline in your crankcase it's because your carburator is leaking fuel into the cylinder heads. From there it goes into the cylinders on top of the pistons. Down past the rings into the crankcase. If enough gasoline goes in there, it will go past the sprocket shaft seal and into the primary case as well.

This is normally caused by a bit of trash getting under the float valve in the carburator. But, on a 1996 model, there is supposed to be a vacuum operated petcock. The petcock is supposed to close whenever there is no vacuum on it that is supplied from the intake manifold. Either the petcock has been changed, which is not unusual since the petcocks were quite troublesome, or it is not working properly.

First, you need to clean out the carb. and get any trash out from under the float valve. Remove the carb from the engine. Take the float bowl off the bottom of the carb. Pull the pin out that holds the floats and remove them and the float needle valve. Blow compressed air through the fuel inlet fitting to clean any trash out of the fuel valve seat. Inspect the needle valve for damage, replace if necessary. Reassemble and reinstall the carburator. Check for proper operation prior to starting the engine.

With the carb cleaned, you can install either an aftermarket manual petcock (Pingel) or a Harley petcock for a 1994 or prior model. These are manual petcocks. When you're not riding your bike, turn the petcock to the "OFF" position. Also, install a fuel filter in your fuel line between the tank and the carb. Get one of the good ones with the scintered metal filters in it.

Change your oil and filter. Check your primary oil as well. Change it if contaminated with gasoline. Before you reinstall your air filter, connect the fuel line to the carb and turn the gas on. Closely watch the inside of the carb throat to see if fuel starts to "bubble up" into the throat of the carb. This usually takes a few minutes so be patient. If it does, you need to replace the float valve needle with a new one and check the float setting. If it doesn't "bubble up" you're good to go. Then, don't forget to turn your petcock to the "OFF" position when you quit riding the bike.

Oct 05, 2009 | 2000 Harley Davidson FLHR-FLHRI Road king

2 Answers

Air box and crank case fuel flooding problem happened before, thinking it was stuck or worn float needles; I installed 2 Carb float needles left side facing rear of carbs , all larger main jets, all...

Well there only one way the fuel can get into the crankcase and that's from the fuel tank. The petcock must be draining and the float needles are not stopping the fuel flow. Do you have a prime position on the petcock? If so do not run the bike in the position. Try topping the tank off with gas and letting it sit for a while and see is the gas has gone down and then check the crankcase and see if there's fuel in it again. i still say its got to be your petcock.

Sep 29, 2009 | 2005 kawasaki ZRX 1200 R

2 Answers

When bike gets worm it runs like ****

to me it seem more like a rich condition not a lean like you would get from a rubber or gasket before you buy the rubbers or gaskets i would pull the carb apart, take the slide out and look down where the needle goes into the jet see if the the hole is oval, also make sure the choke is not stuck open

Dec 23, 2008 | 2001 Harley Davidson FXDL Dyna Low Rider

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