Question about 2005 kawasaki KX 250

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I have a 2005 KXF250 and the bike continuously backfires when i let off the gas and wont stay running at idle. it dies even after its warmed up. whats up?

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Derick Espiritu

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Check/clean the carburator, adjust the air screw... lack of fuel, causing the the engine to backfire when you close the throttle... adjust idle...

Posted on Jun 04, 2011

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follow the cable from the start to finish it might have been bent or damaged. then have a look at the carbs they might have been damaged in the two accidents if the mix is wrong or they are letting in air

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Backfires when choke is on, but almost dies without it when idling


I would check the jetting to be safe but it could also be dirt in the carb. The main jet has very little to do with lower engine speeds and especially idle. That is controlled more by the pilot jet and circuit. Your best clue is how it responds when you add more choke. If it gets worse then there is a rich condition but if it gets better then you have a lean condition. From what you have described it sounds like a lean condition.

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Left carb backfiring thru carb after it warm up


The carbs are probably out of sync. Set the carbs so that both slides crack open at exactly the same moment. Next, balance the carbs by disconnecting one spark plug then turning the throttle screw on the runing carb to a slower and slower rpm until the bike stops idling on one cylinder. Now reconnect that plug and disconnect the other. Do the same thing to the point the engine dies trying to run on one cylinder. Now start the bike up with both sparkplugs in place. The idle speed will be high, but now the carbs are in balance. Turn each throttle screw down in equal portions until proper idle speed is attained. It would be a good idea to set the valve lash also. If the backfire continues, chances are the valves need to be re-seated. Re-sync and balance the carbs after the valve re-seating. Please rate my answer. Thanks.

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I have a 2006 victory vegas 8 ball w/ 900 miles on it. It has never had a problem staying started. For some reason now, i turn it on it stays running for about 3 seconds before it stalls. The air filter is...


Hi, Thomasyu2004 and the usual suspects are:
1. Idle port, transfer ports, slow air jet clogged.
2. Idle adjusting screw set too low.
3. Air fuel mixture adjustment too lean.
4. Pilot/slow fuel jet clogged.
5. Faulty accelerator pump.
6. Float level too low.
7. Float bowl contaminated old fuel, water, dirt, rust, etc.
8. Carburetor bowl vent line clogged/blocked/pinched.
9. Fuel line to carburetor kinked or pinched.
10. Fuel filter clogged.
11. Intake manifold leak.
12. The gas cap is not venting properly or fuel tank venting system blocked.
13. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
14. Needle and seat stuck closed in the float bowl.
15. Multi carburetors not in sync.
16. Faulty fuel pump.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Bike wont run past very low idle She dies when you give her gas
2006 8 ball idling issues
http://www.granitestatechapter.com/mydata/05-06%20Hammer_06%20Jackpot_Service_Manual.pdf
Motorcycle Service Parts Part Finder Victory Motorcycles Store
Victory Motorcycles 2005 Vegas Owner Manual

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

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1 Answer

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sounds to me the valves are not properly adjusted,..like their to tight,...i had run into this in a japanese car once,...check it out and let me know,.....cracklin joe

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clean ur carb and filter m8 and get new plug,tommy

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