Question about Yamaha XVS 650 Dragstar Classic Motorcycles

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Fuel over flowing when bike running - XVS 650 Dragstar Classic Yamaha Motorcycles

Posted by Ian Hirst on

  • Ian Hirst Jun 05, 2012

    there are no float chambers its a diret feed

  • Michael Green Jun 05, 2012

    If you don't have float chambers on your carburetors, then you have a leak not an over flow. Cos somebody has stolen them.

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Michael Green

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Check and adjust the float levels in the Carb or carbs.

Posted on Jun 04, 2012

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What should I check next? Not getting any error codes, replaced the CKP, MAP, IAC, TP, & ET Sensors. Not sure what I should try next, any suggestions would be appreciated.


If no DTC's are recorded, then it is most likely to be a fuel problem. You need to check the fuel pressure with engine running and this requires specialized test equipment. You need a gauge that can connect into the fuel line. Running pressure should be around 55 - 60 PSI. If the bike starts and runs ok for a minute, it is not bad gas. Bad gas is just that, bad gas. It will not burn correctly and the first thing noticed is hard starting. I assume the bike is fuel injection. If it has a carburetor then I would be checking the fuel flow as this symptom sounds like carb is running out of fuel. Dirty gas, fuel with debris in it. The petcock will be vacuum operated and if it has a leak, (on carb models), fuel flow will be affected. Also, the tank vent if blocked will affect fuel flow. Remove the fuel line from the carb, put end into a fuel safe container to stop fuel pouring all over the place generating a fire hazard, apply suction to the vacuum pipe on the rear of the petcock and you should have a good fuel flow. If you don't, then the fuel filter inside the tank on the petcock is blocked or the vacuum part of the petcock is faulty.

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1 Answer

Reserve fuel tank question...


Hi,
Check that fuel valve, pull out that output fuel hose, turn the valve to "reserve", if fuel flows, that means it works( fuel valve ), if no fuel flows, that valve has STUCK valve flow.

Most bike problem is in that fuel valve.

Hope that helps!

Dec 01, 2011 | 1986 Honda VT 500 C Shadow

1 Answer

My 2006 katana starts up runs for a while then shuts off


Has the bike been sitting for a while? If it has, then the carburetor(s) probably needs serviced. It might also be a clogged fuel strainer (usually located in the tank) If the service history of this bike is unknown, then check for a really dirty air filter(s). Try to keep the bike running by giving it some throttle. If it stays running, then the carburetor(s) will probably need to be cleaned and rebuilt. If it still shuts down, then verify fuel flow. Disconnect the fuel line from the carburetor(s) and observe fuel flow when the fuel valve is turned on. Fuel should flow out in a steady stream. If it doesn't, then clean the strainer. If it does, then drain the fuel out of the tank reconnect the line(s) and refill the tank with fresh fuel. If the bike has been sitting for a while, you could have a fuel volatility problem. I hope that this information helps you solve your problem. Thanks for trying FixYa.

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1 Answer

DTR125 (2001) with 1400 miles (yes, only 1400 miles). Bike has been dry stored and not used for 6 - 7 years and I am trying to help owner, who is old and get it running ready for MOT. I have drained and...


Hello,

If you have not done so, please check the fuel filter for good fuel flow. Also, pull the output hose off the fuel pump to see if it has good fuel flow. One more thing... pull the fuel line from the carburetor to make sure that there is a steady flow of fuel.

If all the above components are working correctly, then you might try this; fill the tank with premium fuel (NO Ethanol additives) and add 1/4 to 1/2 ounce of carburetor cleaner (B-12) and add Sta-bil (the recommended amount) to the fuel tank. The B-12 will clean the fuel path and the Sta-bil will stabilize the fuel. Start the bike as you normally would. It will take a bit to get the bike running so be patient. Once you have it running correctly, buy a can of Sea Foam (only if your fuel contains Ethanol additives) and add the recommended amount every other tank for about 4 tanks.

If you are still having issues after doing all the above, please reply with more information so that I may help you further.

Hope this helps. If you find this information useful, please vote on this post. Thank you.

Regards,

Oz

Jan 18, 2011 | 2001 Yamaha DT 125 R

1 Answer

My bike will start but after a few miles dies and won't start again


sounds like the bike is running out fuel the pump is not holding pressure it may be a relay or a clog in the gas tank or a bad fuel line ck fuel filter for flow with a ck of those things or you will find it the carbs float needle may be stuck as well it will let it get fuel to fill the bowl but when you run the bike it wont let enough fuel for wide open running for a short time

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2 Answers

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is the tank fawcett workin--is the pump producing-is there a hindrence in the line--is batt at 12v-and gettin spark to pistons-chec plug cables and whole ignition for operation and good connections

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2 Answers

96 CBR 600F3 runs for approx 10Min then stalls out.


Check the vacuum pipe from the carbs to the fuel tap, if its gat a pin hole in as you demand more fuel the vacuum loss cuts downthe fuel flow and the bike will stop!

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1 Answer

Wont run on prime setting on fuel tap


Hi,

On most Japanese bikes, the PRI position allows fuel to flow from the tank to the carbs even if the engine is not running. In the ON position, the fuel gate valve would only allow fuel to flow if there is vacuum which of course would mean that the engine is running. There is normally a vacuum hose from the intake manifold of cylinder 1 that leads back to the fuel valve that triggers the internal diaphragm to open the fuel line.

If we are to assume that for some reason the PRI position is blocked, then switching the "fuel tap" to this position would not allow fuel to go down the carbs. Thereafter, the engine used what fuel was left inside the carbs (100 meters) and the engine died. Switching the "fuel tap" back to ON again would not allow fuel to flow down from the tank to the carbs since there is no vacuum and very little vacuum when starting the bike; and the bike would not start, no fuel inside the carbs.

Correct action of course would mean overhauling the "fuel tap" and initially setting it to PRI and then to ON soon as the engine is running on its own. Temporary remedy/workaround would be to manually feed fuel to all the carbs with the use of an external container with rubber hose/fitting. Alternately, you can try spraying starter fluid or car injector cleaner. This should be done with the air cleaner off. A word of caution, in some older bikes I have worked on, this condition would result to an overflow of the carbs soon as the engine starts indicating that the float(s) inside the carbs are sticking.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information. Good luck and kind regards. Thank you for using FixYa.

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1 Answer

Fuel stops flowig


and then the fuel will stop flowing thru the lines. i can see it stop thru my inilne filter. so i took the tank off and cleaned it out. check the petcock it's good and flows good. so now my only guess is a stuck float but i just went thru the carbs and check the float valve and the housing and it all looked good with lil to no ridges on the rubber points. anything else that could be causing it to stop flowing. Sounds like your fuel tank vent is plugged. Try riding until the bike dies. Open the tank. Do you hear a hissing noise as the tank opened? Close the tank and try to start the bike.,,

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