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Old 12-04-2016, 11:05 AM
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Moto 06 Yz250f Carburetor Issues?

     

Rookie here. Im trying to figure out the problem. Bike idles only with choke out. It cannot idle more than 10 seconds after the choke is in, the bike turns off and when I give it gas it turns off too. I have to have the choke out when I start the bike, even if its already warm. The bike cannot handle low RPMs or it will shut off. I think it has something to do with the carburetor. Any ideas?
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Old 12-04-2016, 12:02 PM
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The most likely causes are...
Dirty pilot jet.
Fuel screw not set correctly.
Acelorator pump not set correctly or diaphragm leaking.
Float level set too low.
Restricted fuel flow.
Dirty fuel tank vent and carb vent lines.
Leaking hot start plunger.

Paw Paw
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Old 12-04-2016, 12:05 PM
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Would buying a new OEM carburetor help?
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Old 12-04-2016, 01:50 PM
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That would be very expensive. These carbs are not hard to work on either. They do have a lot of parts and frighten many folks away from working on them and thus they get neglected.
The pilot jet can be removed and even replaced from the carb while the carb is still on the bike. It can be removed via the float bowl drain hole. They do get clogged up with todays pump gas in just a week or 2 while the bike is not being run. There are many videos on line with instructions on how to work on these units and how to adjust them.
Even if you were to purchase a new OEM carb it would still need many adjustments to get it run perform correctly.
The best thing to do is to remove the carb, clean it and then adjust it correctly.
Remember that this is an eleven year old carb and thus may need attention. Parts do wear, get dirty and need adjusting and some new parts installed.

Paw Paw
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Old 12-04-2016, 03:03 PM
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PawPaw is right. A good carb service, even if took it in to a shop would be cheaper than replacing the carb. There is something causing your carb to run lean (too much air, not enough gas).
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Old 12-04-2016, 05:09 PM
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I do have an aftermarket air intake, could that be the reason?
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Old 12-04-2016, 06:19 PM
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Maybe, what is it?

Paw Paw
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Old 12-04-2016, 07:20 PM
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K&N air filter.
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Old 12-04-2016, 08:55 PM
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I have run those and found them to lean the fuel air mix out a bit, but not enough to do all the things you are talking about. You may want to go one size larger on the pilot jet. You can try going back to the OEM filter and see if it helps, however. Your best bet is to still clean and adjust the carb.

Paw Paw
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Old 12-10-2016, 06:44 PM
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replace the pilot jet and the needle valve seal which in #11 on the schematic https://www.rockymountainatvmc.com/oem-schematic/4 (click on carburetor) this is a common cause of the symptoms you are describing and also check the accelerator jet inside the carb throat, when you pull the throttle the nozzle should spray fuel, if it doesn't you need to unclog it. It isn't easy to do and unfortunately they clog easy especially if you are using fuel with ethanol. Carb cleaner and a small needle and compressed air works with a little work. Good Luck!
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