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06 katana 750 sat for 2 yrs cleaned carbs new plugs, wires, new tank ,gas, vacuum lines, will run with starter fluid then let sit it will run for maybe a minute then won't start I've replaced everything I can think to replace. Any help? Gas in bowls but it ain't getting into the carbs

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  • Master
  • 409 Answers

Clean carbs again and concentrate on the idle/starter jets...the holes through these block very easily and produce the kind of symptoms that you describe

Posted on May 10, 2014

  • darryl May 11, 2014

    try your fuel pump

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Posted on Jan 02, 2017

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SOURCE: running rough. no gas going to front plug.

If your plug is dry, then there is no fuel. This can happen for two reasons: No compression - be sure to get a compression tester and ensure that there is enough compression produced by the engine to enable the engine to run. More than likely, though, there is no fuel getting to the engine. When cleaning carburetors, it is important that you use a chemical dip. Spraying carb cleaner through it is not enough. Be sure to disassemble completely: fuel float and its needle and seat, all jets, all emulsion tubes, all air cut off systems and accelerator pumps, all enrichment circuits (choke), vaccum slide and diaphragm, all air jets, and last but not least - the idle air/fuel screw. If this is the first time the carb has been taken apart you have to drill the cap to get to the screw. once everything is apart, soak all metal parts in the Berryman or equivalent chemical dip solution for at least several hours. After, run hot water, as hot as you can stand over all dipped components and blow out with compressed air. reassemble and enjoy.

Posted on Sep 25, 2009

  • 35 Answers

SOURCE: 1995 750 Katana will not stay running

did you try the fuel petcock on the bottom of the tank? If not, pull it out and check the fuel filter on the top of it. If it won't start because of no fuel, that maybe the problem or it could just be a vaccum leak. Check the tubes for leaks or just replace them, they are cheap. If it isn't starting because it floods out from to much fuel, then it might just need a new petcock. How did the diaphrams on the top end of the carb look?

Posted on Sep 13, 2009

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1. remove the full line from the carb, turn on the petcock and watch it flow into a container. Make sure that the petcock is in the correct position and that the tank has at least a half tank of gas. If the petcock does not flow gas, the tank/petcock has a fuel flow issue. If the petcock has a smaller rubber line connected (vacuum controlled) to it, it will need vacuum applied to it before it will flow fuel. Vacuum can be applied using a hand held vacuum tool (purchased at a auto store) or light suction from the mouth will do.

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I just bought a 1988 yamaha virago 750 and it was stored outside covered for over 4 yrs.Cleaned carbs and gas tank,put new plugs in,new fuel lines and checked fuel filter is ok. I have spark,compression...


good start on cleaning things BUT, you should replace pump. the pump will have the same gum **** the tank did. you can unhook lines and turn over to see how much fuel you get

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Hi and welcome to FixYa,

To determine if fuel is entering the combustion chamber, place back the spark plugs without the wires. Start and remove the spark plug again. They would be wet with fuel.

Additionally, loosen the drain screws at the bottom of the carb's bowls. Collect the draining fuel from the drain hose individually. Compare quality and quantity while noting for presence of sand, dirt, rust, water or any other contaminants.

Starter fluid maybe used.

Good luck and thank you for asking FixYa.

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If that is carbureted, and has a mechanical fuel pump, try running a length of fuel line from inlet side of pump to a gas can that has fresh, clean fuel, and if it runs good that way, you know problem is most likely in the tank. Removing the tank & cleaning it out is best solution from there. I'd even be tempted to add a small bottle or 2 of Lucas Fuel Sytem Cleaner to first fill in clean tank, just to help clean lines as well as carb.

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