Question about Suzuki GSF 600 S Bandit Motorcycles

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Wont start. when turn over backfires

Bike was starting only firing on 3, but fires on all 4 with choke on. now bike wont start at all. and backfiring.

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  • Suzuki Master
  • 1,190 Answers

Check fuel is good and not older than 6mths if bikebeen stood long period ? carbs may need cleaning !

Posted on Dec 06, 2013

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Posted on Jan 02, 2017

  • 2336 Answers

SOURCE: bike backfire

Yes, it could (and probably is) be an air leak. Check to be sure the carb is tight in the intake manifold, and make sure the hot-start isn't loose and is sealing properly. Also make sure all of the exhaust system joints are tight, an air leak in the exhaust will make a four-stroke pop and backfire like an old work truck with no muffler...

Posted on Nov 10, 2008

  • 2336 Answers

SOURCE: backfire

Yes, it could (and probably is) be an air leak. Check to be sure the carb is tight in the intake manifold, and make sure the hot-start isn't loose and is sealing properly. Also make sure all of the exhaust system joints are tight, an air leak in the exhaust will make a four-stroke pop and backfire like an old work truck with no muffler...

Posted on Nov 10, 2008

  • 2336 Answers

SOURCE: backfire

Yes, it could (and probably is) be an air leak. Check to be sure the carb is tight in the intake manifold, and make sure the hot-start isn't loose and is sealing properly. Also make sure all of the exhaust system joints are tight, an air leak in the exhaust will make a four-stroke pop and backfire like an old work truck with no muffler...

Posted on Nov 10, 2008

  • 2336 Answers

SOURCE: backfire

Yes, it could (and probably is) be an air leak. Check to be sure the carb is tight in the intake manifold, and make sure the hot-start isn't loose and is sealing properly. Also make sure all of the exhaust system joints are tight, an air leak in the exhaust will make a four-stroke pop and backfire like an old work truck with no muffler...

Posted on Nov 10, 2008

  • 2336 Answers

SOURCE: backfire

Yes, it could (and probably is) be an air leak. Check to be sure the carb is tight in the intake manifold, and make sure the hot-start isn't loose and is sealing properly. Also make sure all of the exhaust system joints are tight, an air leak in the exhaust will make a four-stroke pop and backfire like an old work truck with no muffler...

Posted on Nov 10, 2008

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Bike sits a lot,Hard to start, will only continue to run with choke on. Bike backfires alot.


You need to clean your carburetors. The ethanol that is in gasoline turns to an orange colored film
and it clogs the jets. The prevention for this seems to be seafoam added to your gasoline after your carbs are clean.
It does work. If your bike sits a lot, i would also suggest that you start it up weekly and let it warm up. Sitting is the worse thing for gasoline.
Judging from your description and other problems, the backfire is probably bad gas not burning and igniting in the cylinder when overloaded with gas.
A good carb cleaning, consists of taking the carbs off the bike, taking out all the jets and soaking everything in a good carb solution.
I would start with the carb cleaning, drain the old gas out of the tank, start with fresh 93 octane and add the recommended dose of seafoam listed on the back of the botlle to your gasoline.
Put a set of new spark plugs in it, and fire it up.
Your back fire should be gone as well.

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Sounds like your flooding it out with the choke out. Try the next time you go to start the bike when it's cold with the choke out and when it starts push the choke all the way in and keep it running with the throtle. If it runs better after doing this then your flooding it on start up. Use 1/2 choke to start cold and see what it does. Good Luck

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2 Answers

Has firing but wont start


check if its getting fuel and air, you need All 3 to make it run, if you have all of that (and going on the its firing concept) all that need to happen is fuel goes to carb, intake turns it to vapor, spark plug fires and ignites the fuel vapor and that causes the piston to go, so if its firing and all the above are good you should check the points and condensor, it should turn over for a few seconds and backfire if its not backfiring its likely not getting fuel, try to spray some ether(quik start or just some gas directly into the carb to see if anything hapens, You may need to take it to a shop or have friend with some mechanical background help ya. good luck Rotticus,
p.s. in the future be more specific and we can try to get more details for you, also google the bikes make and model and you should find some schimatics.

May 02, 2009 | 1981 Yamaha XJ 650

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