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MgOnZo700
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« on: October 26, 2006, 11:12:01 PM » |
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OK i have a kymco MXU 250, and have had it for 2 years now and this is the first problem It has had. It does not want to stay on idle, if I rev it, it runs and starts perfectly(except for more backfire) but if I let go of the gas it just turns off. Same thing happens on choke. I alway run it with 93 octane. And the idle screw is fine.
I dont know what to do. Please help.
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UncleRico
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« Reply #1 on: October 26, 2006, 11:34:22 PM » |
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Sounds like a lean condition, if you're backfiring and stalling out.
Pull your spark plug. Is it dark and wet?
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UNLUCKY #13 RACING "I want to thank my sponsors, Jack Cass Bail Bonds, The Cleveland Steamer Carpet Cleaner Company, The Rusty Trombone Pub, and Dirty Sanchez's Liquor and Check Cashing."
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Big Kev
Junior Member
 Offline
Location: Venice, FL
Posts: 32
Owner of the KodiCRAP.
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« Reply #2 on: October 27, 2006, 12:29:15 AM » |
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Maybe you need to adjust your throttle cable? dunno if that would make the backfire though..
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Holeshot36
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« Reply #3 on: October 27, 2006, 06:09:29 PM » |
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Pilot jet might be cloked up. I would pull the carb off and clean it real good. Make sure you can see light through all the jets.
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UncleRico
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« Reply #4 on: October 28, 2006, 05:56:19 AM » |
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Did you forget about us? If it's both backfiring and stalling, your most likely culprit is a lean condition do to a gunked up pilot circuit.
Like Holeshot said, give your carb a good going over.
Pay attention particularly to the pilot jet.
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UNLUCKY #13 RACING "I want to thank my sponsors, Jack Cass Bail Bonds, The Cleveland Steamer Carpet Cleaner Company, The Rusty Trombone Pub, and Dirty Sanchez's Liquor and Check Cashing."
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450rcrazy
Guest
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« Reply #5 on: October 28, 2006, 08:08:05 AM » |
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another possability is a burnt valve or cracked valve ,clean carb thourougly if the same thing happens do compression check and leak down test.
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Chevy1500z71
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« Reply #6 on: October 28, 2006, 09:44:45 AM » |
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just pull the bowl off and cleen the main and pilot jet and u should b fine.
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honda guy250
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« Reply #7 on: October 28, 2006, 09:46:21 AM » |
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mine was doing the same thing, took it to the dealer under warranty and just turned out to be condensation in the carb float bowl
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MgOnZo700
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« Reply #8 on: October 28, 2006, 07:44:06 PM » |
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Ok thanks. The bowl is the bottom part of the carb rite?? and can there be gas in the engine while i do that??
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450rcrazy
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« Reply #9 on: October 28, 2006, 08:00:26 PM » |
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make sure you turn the fuel valve to off on the bike ,most carbs also have a bowl drain .if so drain the bowl into an approved container (bottom of a milk jug works too) then remove carb from bike and clean .P.S. I would'nt smoke or play with matches while ya do this
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MgOnZo700
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« Reply #10 on: October 28, 2006, 08:03:19 PM » |
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Ok thanks.
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Holeshot36
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« Reply #12 on: October 29, 2006, 06:47:27 PM » |
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Did you pull the jets out and make sure there clean? The plastic piece wans't laying there when you pulled the float bowl off was it? (just making sure)
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MgOnZo700
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« Reply #13 on: October 29, 2006, 08:31:42 PM » |
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yea the platic piece was just layin there. And were are the jets?
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450rcrazy
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« Reply #14 on: October 29, 2006, 08:47:05 PM » |
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the jets are above the bowl .They are in the half of the carb that is still attached to the bike normally they are either hex shaped or have a screw driver slot in them .Remove carefully .the threads are very fine and can be cross threaded or stripped easily.That plastic piece normally goes around the main jet .Unless it broke I dont know how it would just fall off .But then again I never pulled that exact carb type apart before ,but most carbs are simular.
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MgOnZo700
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« Reply #15 on: October 29, 2006, 09:01:36 PM » |
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O ok thanks.. Ill work on it tomorow.
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yfz450runner
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« Reply #16 on: October 29, 2006, 09:24:47 PM » |
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yeah i had the same type of problem on another 4 stroke motor. pull the carb completly apart and clean it. even if it looks clean doesnt mean it is. use a paper clip or fine guitar wire to get into all of the small holes in the pilot jet. pay atention to how everthing comes apart. and make sure you put it back together the same way. make sure the float is set right, ussally about half way or so. if gaskets look torn or old replace them. if you cant get the gasket parts then go to the autoparts stor and get raw gasket material and make copies of your own, its easy and works fine. dont overtighten the screws you will only possibly strip them. hope this helps. good luck!!!!
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MgOnZo700
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« Reply #17 on: October 30, 2006, 06:55:38 AM » |
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ok, that looks more complicted but ill try.
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BonesTM
Junior Member
Offline
Location: Miami, FL
Posts: 38
Did I clear That?
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« Reply #18 on: October 30, 2006, 07:33:46 AM » |
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Don't worry you'll be fine. Just make sure and do what yfz450runner said and pay attention to how things go before you take any thing off. I personally like to draw a small diagram on how things go. It also helps to take pictures and to have a very clean area to work with. Get yourself a clean bright cloth and layit on a nice flat level area and put all the screws and parts you take off in the same order you took them off. Also make sure you really clean your bike before starting any work on it.
Good Luck!
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If your not living on the edge.....
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2005 Suzuki Z400, ProTaper, K&N Filter, ProArmor SwingArm Plate, ASV C5 Levers, Pro Armor Skid Plate, Maxxis Razars Rear, ITP Holeshot Front
2004 Yamaha 350 Bruin 4x4
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