Question about 1983 Yamaha XZ 550

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What is the order for vacum line set up on the carb and to fuel tank, Carbs backfire not starting

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  • Yamaha Master
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Get ur self a clymer manual today for details-the bikes suffered enuf olschooler

Posted on Mar 28, 2011

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6ya6ya
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Had carbs rebuilt and suppose synced but bike starts hard and when running backfires whin you let off the throttle


1. choke circuits still plugged up or carbs not cleaned correctly; most people that attempt to clean their own carbs do not have the proper equipment to do it with. Most carbs have really small orifice(jets) and require really small jet drills/orifice cleaners to clear them out. Cleaning them in a caustic soak tank will clean them out but the carbs must be taken completely apart or it will damage any gaskets or rubbers parts left in it. Carb cleaning should be left to professionals unless one has experience doing it.

2. Open/broken vacuum lines can make it hard to start and backfire when letting off the throttle; jets that are not cleaned out correctly can also make it backfire.

3. If the backside of the inlet grommets are not sealed at the flange and have a vacuum leak, that will cause hard starting and backfire also; this applies to carbs with a flange style grommet. If the intake grommets are cracked or leaking it too will cause hard starting and backfire. Remove the carbs, wipe the head and mating flange surfaces with laquer thinner, let it dry and then reseal the grommets back to the head with rtv silicone rubber. Make sure to wipe any excess rtv(before it drys) from down inside the port before putting the carbs back on.

Feb 20, 2013 | Honda F6 C Valkyrie Motorcycles

1 Answer

Gp800 doesnt seem to be getting any fuel from tank to carbs any ideas


Are you positive the fuel lines didn't get reversed? Did the pulse line get hooked back up? can you feel any resistance in the fuel lines when you blow thru them?

Feb 05, 2013 | Yamaha Water Sport

1 Answer

1984 GL1200 Goldwing... 80k mi. ....bike will not run without choke on 1/4 to 1/2 open... when given throttle, the engine backfires and blows black soot out of exhaust... new spark plugs with gap set at...


This sounds like a fuel flow problem. I suggest removing and rebuilding and cleaning the entire system, meaning Carbs, filters and strainers in the tank. Old fuel turns to gel, and floats absorb fuel, sometimes, so inspedt everything. When finished set carbs with carb sticks, both at idle and at 2000 RPM, using hand throttle.

Oct 26, 2010 | 1984 Honda GL 1200 Aspencade Gold Wing

1 Answer

Wont start been sitting for a year turns over but wont fire cant find how to get seat off or where to drain old gas


you have to use the key and the leaver in just back from the key side then take out the bolt that holds the tank down 12 mm you have 2 hoses going to the carbs one is a vacume line the other is fuel remove from thank then slide tank back and you should be able to drain the gas out of the tank but if you huck up a fuel line to the pitcook and drain the fuel into a pail you wont have to remove the tank pull the spark plugs and put fuel in and trie to start it again you may have to do this a couple of time to prime the carbs

Jul 16, 2010 | Motorcycles

1 Answer

93 Suzuki Katana GSX 600 fuel issues?


You need to check and see if you are getting fuel from the tank into your carbs, if you pull the line that feeds the petcock valve off the top gas should come out. If it doesnt there is a clog in your tank. Now pull the line off the bottom of the petcock valve (this feeds your carbs) and make sure you have fuel at all setting of the petcock valve except for off. If you dont then you probably have a bad petcock valve. If you are getting fuel from the petcock vavle into you carbs then there is a problem with your carbs.

If you take the fuel bowl drain screw out of the carb (located on the bottom). Gas should run out of the associated carb, if it doesn't, then you have something stuck in the carb and one carb not working correctly can make the bike not run. If you find this to be the problem get a can of carb cleaner, take the fuel bowl drain screw out and let the gas run out, stick the red spray wand from the can of cleaner into the hole and flush your carbs out really good.

Then give it a try. Make sure that the connection between your carbs and head is tight while you are there. If that does not fix your problem you may ahve to pull the carbs and take a closer look.

Apr 08, 2010 | 1993 Suzuki GSX 600 F (Katana)

2 Answers

My '05 EFI Softail Classic just quits while riding. It acts like it runs out of fuel, or loses fuel pressure and just idles to a stop while riding. It starts back up immediately but seems to have a bit of...


this may help,try checking that your fuel tank is venting properly,if it has a blocked vent then it will create a vacuum in the tank and will not allow fuel to drop to the carbs,once the engine has stopped the suction from the carbs to the tank stops,the vacuum then disappears and the fuel can then run to the carbs,my bike did something similar and it turned out to be a blocked vent....hope this helps

Jul 06, 2009 | Harley Davidson FLSTSC - FLSTSCI Softail...

3 Answers

1983 Honda CBX 550 backfires a lot and has no power


If the fuel is a year old, Replace all of it.Stabilizers are not restorers. Your backfiring may very well be due to the inconsistancy of the fuel. Try it and see if that gets you flying.. good luck

Jun 14, 2009 | 1983 Honda CBX 550 F-F2

3 Answers

Vacum and fuel line diagram needed


I have an 89 Katana and don't know where the two vacuum lines on the top of the carbs go

Mar 11, 2009 | 1989 Suzuki GSX 750 F (Katana)

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