Question about 2002 Hyosung RX 125

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Starting Bike will only run if i take out the spark plug and dump a little gas in could it be my flotes or what

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Open the carburetor air flap then press down on the accelerator lever like you are twisting the throttle do you see a stream of gas in the bowl? if not check your fuel filter and, or, float assembly

Posted on May 21, 2009

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I am trying to start my hyosung rx250
but it keeps wanting to back fire i just bought it on trdeme

Posted on Sep 01, 2009


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A little more information is needed here. Is the bike turning over? Is the starter motor turning the engine over but not starting? Is it sputtering or coughing or backfiring?

Was it running and then just stopped? has it been sitting for a while and now won't start?

Engines need fuel, air, compression and spark to fire. Try the following. Try to start it and then:

1. pull the spark plugs. Are they wet? can you smell gas? If not you probably are not getting fuel to the engine for it to start. This bike probably has fuel injection. On many FI bikes, when you turn it on you can hear the fuel pump turn on. do you hear that? Look at the fuse box and see if you have a blown fuse for any critical functions such as fuel pump, ignition, etc.

How do the spark plugs look? Are they corroded and black and burned looking? Fouled spark plugs. Try replacing them. If they are whitish and look as if the metal as eroded away your engine is running lean and you need new plugs but also need to address running too lean or you will burn up your engine.

2. If spark plugs are wet you are getting gas. hold the base of the spark plug against metal such as the engine and press the starter. You should see a spark on the plug if it is properly grounded. If you don't see a spark then either your plugs are bad or you aren't getting spark due to a dead battery or a problem between the battery and the spark plug such as fuse box or an issue with chip that controls the engine.

3. How old is the battery? If you are having battery issues you probably can't run the starter but you might be having issues there as well.

4. If the bike is sputtering and backfiring it is probably a timing issue. I don't know your model of bike but I am pretty sure the timing is controlled by a chip. That may have issues or again, maybe a fuse that controls elements of the ignition system has blown. Are there any wires that have broken or have exposed metal that could be shorting? Any of the leads to the FI system come undone?

May 06, 2014 | Yamaha Motorcycles

1 Answer

Fully charged battery on my 1996 cb500,choke out however wont fire up just does a little puff like sound

Check for spark at spark plug.
1. If no spark, test the wire to the coil with test light and see if you have power to coil.
2.If no power to coil, make sure your on/off button is on and working.Use test light.
A. Power at the switch but not at the coil indicates a broke wire from switch to coil.
B. NO power at the switch indicates ingintion switch is off or faulty and not sending power to your switch , make sure key is on. Use trest light.
3. If you have power to the coil but no spark from the coil - replace the coil

Check for spark at the plug
1.If you have spark at the plug, but not starting - check that your carbs are getting gas.
2.Petcock Could be off, Fuel Filter could be clogged, Carbs could be dirty or clogged and your not getting any gas.
3.Pull spark plug - If no gas present then your not getting gas, if wet then you getting gas and your flooded. Make sure you have good gasoline, Bad gas won't burn.
or your bike is worn out and dont have any compression.

With Good gas, and Good Spark, and Good compresssion, the bike will run.

If your not getting gas to your motor through the carbs, pull carb off and thouroughly clean it.

Dec 03, 2010 | 1997 Honda CB 500 S

1 Answer

I have an 84 K100 that will not start. The bike has set for 1 to 2 years with the same gas. The bike was my brothers. I drained the gas from it and replaced with new gas. The bike will start and run as...

drain out all of the old gas first, put in fresh fule fully charge battery and retry starting her up, if no luck starting unclip fule pipe from injector rain and cranck motor over if fule spills the fule pump is working ok, pull off ecu plug and spray with wd40 all plugs and refit check spark do not let spark plug hand loos this must stay earthed or it can wreck the ecu if motor starts up, when it starts up some injuctor cleaner in fule tank and run engine up

Nov 12, 2010 | BMW K 100 Motorcycles

2 Answers

Trouble starting but once started runs good

How long since your bike was properly serviced? Service includes oil, oil filter, air filter, spark plugs, valve clearance check, fuel filter etc. Check for cracked PCV vent hoses around throttle bodies. checking of throttle body sync. These bikes usually run very well when properly maintained. Trouble starting when cold could be caused by many different things.

Good Luck!

Oct 10, 2010 | 1993 BMW K 1100 LT

1 Answer

Hi there technician i need your help if you can.i have a 2002 honda fourtrax 350.the problem is the machine stalled when it was running.and it finally did i tried to start it i pumped a fuel from the carb...

Generally when you try dumping a little gas down the carb, or use starting fluid, and if it still does not even sputter, it is electrical and not a fuel problem.

I would use an inductive timing light to tell if you really have spark or not.

If there is no spark, then it is either ignition switch, the pickup or the coil. The coil is easily checked by a parts place like Autozone. Ignition switch can be checked with test light.

Aug 27, 2010 | Honda CB 350 F0 Motorcycles

1 Answer


I recommend that you go to any auto parts store and get an aerosol can of starting fluid. Shoot a couple of quick bursts into the air intake area and pull it. Repeat until it starts.

If you can have a second person operate the aerosol can for you it will go easier. Let it run on the starter fluid for a few seconds until the glaze in your carbeurator is cleared out.

In the future after you empty the gas out of your chain saw start it up and run it until it completely runs out of fuel.

Aug 19, 2009 | Garden

2 Answers

My 98 Suzuki VL1500 has a weak spark to the rear cylinder. i've replaced plug, plug wire, coil, inition module, and stator. I've switched coils and plug wire from one cylinder to the other. The weak spark...

it is probably not a weak spark. if you are determing this because the plug is sooting up and fouling and or the bike is missing or just not running right. your carbs need rebuilt. know of same problem with friends bike. tried eveything. coils igniter etc.. check out g man give them a call they will explain what is going on with your bike

Jun 13, 2009 | 2001 Suzuki VL 1500 Intruder LC

4 Answers

My 50cc mini bike starts then dies 5 secs after starting. why?

It sounds like you may have 2 problems

  • Bad gas
  • dpossible loose spark plug( bad compression)


dump out the gas put new in
Remove the spar plug and examine the plug if it is wet and black it is fouled
if it is white ad dry it is not getting gas

If you can replace the spark plug if not just clean it with a wire brush put back in and tighten

Finally make sure the spark plug wire is not lose

Best of luck to you

Jan 01, 2009 | Mini Motorized Bike

1 Answer

999 Starting problem, deducing step by step

Next time this happens, take out 1 spark plug and inject a little gas, replace the plug. (You can do both f you want but 1 is enough) If the bike fires up it is prob not getting gas for some reason…

Nov 20, 2008 | 2003 Ducati 999 R Fila

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