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My gxv-620 honda engine backfires through the carb,and wont take the gas

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  • Motorcycles Master
  • 3,799 Answers

The usual cause of this is the ignition timing. Use a timing light and check with the engine running.

Posted on Oct 30, 2012

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Posted on Jan 02, 2017

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landsend
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SOURCE: runs great until hot.

put some fuel cleaner in the fuel tank and replace the spark plugs.

Posted on Mar 22, 2009

  • 8 Answers

SOURCE: Engine won't start but backfires every so often,

Sounds you have a problem with the carb float and needle assembly (i.e. the float and needle are not stopping the flow of fuel into the carb even when it is full as they should).

Backfires are a symptom of too much fuel in the combustion chamber typically. Try turning your shut off valve to "off" and let it sit for a day - then try to start it with the valve still off. Ideally it will start and run for a bit - until it uses the fuel available in the carb. If not - provide more detail.

Posted on Sep 10, 2009

  • 76 Answers

SOURCE: have a honda crf100f 4cycle got spark wont start,

CLEAN THE CARB AGAIN IF IT RUNS ON STARTING FLUID ITS NOT GETTING FUEL YOU WILL NEED TO REMOVE THE JETS AND MAKE SURE THEY ARE CLEAR

Posted on Jan 29, 2010

voices122
  • 12 Answers

SOURCE: my honda cbr 600 wont start and keeps backfireing

Check your plugs. If all four are sparking then your carbs are out of sync. They will need to be re-balanced.

If you are capabable in doing this job your self, you will need a screwdriver that fits your adjuster screws and a CarbTune Carb balancer.
Remove your tank and airbox.
You should see the flaps inside your carbs. These should open when you move your throttle.
Start on the outside carbs to get them balanced with the 2 centre ones.
To start, unscrew the adjusters all the way out. then screw them in until the 2 outer carbs move at the same time as the inner 2 carbs
Once this is done then adjust the centre balancer to syncronise the 2 left hand carbs to the 2 right hand carbs.
Now if you have done this correctly, all four carbs should open at the exact same time.
If you have a Carbtune balancer, remove the plugs from the top of your inlet manifold and plug in the hoses from the carbtune balancer.
Start the engine and adjust the screws until the weights inside the Carbtune balancer all read the same.
Once done, remove the balancer, replace the plugs into the inlet manifold, refit the airbox and tank and it should run so much better.

If your not 100% confident to unertake this job yourself, take the bike to your local dealer and ask to have the carbs balanced.

Posted on Mar 15, 2010

miket756
  • 2702 Answers

SOURCE: honda xbr 500 carb backfire

it could have a burnt out inlet velve or it may be the velve clearence is to tight check velve clearence first

Posted on Mar 17, 2010

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I have a 1991 honda cr250r and it keeps fouling spark plugs and has lost power it wont rev up all it does is pop and backfire and most of the time just dies what could be wrong with it


Fouling is caused by incorrect fuel oil mixture, or too much gas (rich carb mixture, not enough air).

Pop and Backfire can be a few things. Bad ignition timing is my best guess. Also look at broken or badly sealing power valves.

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2 Answers

Engine wont start it backfires through the carb


Make sure the timing is correct. Backfiring is often caused by an engine out of time.
Good idea on the carb rebuild. It may be letting too much gas in.

Jan 15, 2012 | Cars & Trucks

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