Question about 2003 Yamaha YZ 250 F

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Starts but dies after few seconds

No matter what the throttle position is, choke or no choke, it dies like someone hit the kill switch. I have traced all the wiring, confirmed that the kill switch is good, cleaned the carb... still dont know whats up with it. starts fine when cold, but after it dies off, its a bear to re-start. please help!!

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  • Contributor
  • 23 Answers

Re-due your carb. float too high or too heavy

Posted on Nov 19, 2013

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Posted on Jan 02, 2017

  • 66 Answers

SOURCE: 2003 yzf450 wont run right?

recheck pilot jet & pilot circuit.also check compression

Posted on Feb 16, 2009

  • 492 Answers

SOURCE: 2000 yzf R6 inconsistant idle under choke cuts out when punched

Yes. Sounds like main jets are blocked. Gas will start to varnish after a couple of months. This builds up over time and sticks the main jets. Go to this website and select discuss this bike.http://www.bikez.com/motorcycles/yamaha_yzf-r6_2000.php

Posted on Apr 30, 2009

  • 1 Answer

SOURCE: cold starting problems 1981 yamaha maxim 400

I had the same problem. I found that the ground on the wire harness under the seat was not grounded! It is worth a check.

Posted on Jul 15, 2009

Adrian762
  • 425 Answers

SOURCE: 1991 yz 80 won't run with choke off.

Go to http://www.carlsalter.com/motorcycle-manuals.asp , and down load a (free) manual, then go through the trouble shooting section.

Posted on Dec 30, 2009

  • 105 Answers

SOURCE: 2002 Big Bear 400. Dies after a few seconds upon startup

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

Posted on Jan 10, 2010

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Fuel starvation either too the carb or in the carb itself, start with a simple cheap fix, replace the fuel filter in the tank on the end of the fuel hose.

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Engine will start but only run at choke or half choke and low throttle sputteres and or dies if you try to increase to full throttle and dies if you take off choke


Check fuel pump delivery for adequate flow. If when choke enrichment is applied and it runs, then dies when choke is off, fuel flow is inadequate and needs choke enrichment to compensate. Also, if engine dies or chokes when increasing rpms, this will be a symptom of too little fuel. Check fuel flow at pump, then, if flow is good, check for carb blockage, unscrew the jet and inspect, check the operation of the solenoid at the bottom of the bowl, it has a wire attached to it. Trace that wire to where it plugs in, unplug it and touch it to the positive pole of the battery, it should retract. If not you need a new solenoid that has the job of metering in gas to the inner bowl below the jet assembly.

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I have A Scott Bonner lawn mower ,high performance,overhead cam, SX 4000, 4 stroke.I am finding it very difficult to start the cold mower every time I go to mow the lawn.It takes me about half an hour of...


Hi and welcome to FixYa, I am Kelly.

The symptoms you describe are typical of debris in the fuel bowl of the carb. I am going to assume for the moment that it is a similar to a Briggs and Stratton engine. Engine model type and serial information is what we work with to resolve engine problems regardless of the mower brand. I note you said it was a Scott Bonner SX4000 engine. I am also assuming that you have the 18 inch GreenKeeper like this one:
http://www.rovermowers.co.nz/www/rover/Home.nsf/13a851504c93cb754a257821000cfc6b/$FILE/28045.pdf

I do not have access to Scott Bonner Engine parts or technical data but if you clean out the fuel float bowl and it is still hard to start then the choke function of the engine is not working. Your engine has a "Bowl drain" screw on the bottom of the carb float bowl for removing carb debris or water in addition to a bowl nut.

Most likely due to the throttle cable needing and adjustment so that the choke is closed when choke is selected. Adjustment of the throttle cable is as simple as losening the clamp screw (Do NOT remove it) on the side of the carb throttle control and moving the throttle to STOP then re-tightening the clamp retaining screw. This should allow your choke to move full closed when selected. You may have to experiment with full throttle and STOP throttle control positions with the clamp screw loose but not removed to see which position will give you full throttle, choke and STOP. After each adjustment you MUST tighten the clamp screw to test the throttle cable travel on the the throttle plate. Beleive it or not... the person that assemble the mower made the intial throttle adjustment. It may have never been tested before you got the mower.

If you still have problems.... this is the brief way to start an engine that has choke problems. Remove the spark plug and squirt a splash of gas into the spark plug hole and then re-install the spark plug. Just don't over-do the splash of gas and if your messy wipe off the excess so you do not start a fire. (This method always works but you occasionally foul a spark plug with too much gas)

Thanks for choosing FixYa,
Kelly

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1 Answer

Starting instructions on off switch only labeled O and -


O and I are the international symbols for off and on. The O is the off position and the I is the on position. Put the switch in the I position. Make sure there is properly mixed fuel in the tank. Your Mantis probably uses fuel mixed 1 part 2cycle oil to 50 parts gasoline. Push the primer bulb a few times until you see fuel in the bulb. Position the choke lever to full choke, open the throttle completely and use short, quick pulls on the rope until the engine sputters. Reposition to choke to half and pull the rope again. The engine should start at this time. Let the engine run for a few seconds, then push the choke lever to off. Go to work in the garden.
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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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Sounds like a kill switch is going bad or ignition wire getting grounded along the frame or elsewhere. A bad ignition switch can do the same thing. Check the side stand kill switch if your bike has one. Check all electrical connectors. A loose or dirty connection can screw up the works.

Please rate this solution. Thanks allarismith!

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