Question about 2004 Honda CRF 250 R

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Also, once the bike is warm, it starts up no problem, its just getting it to start. the fuel/air mixture screw has been set to the stock requirement( 2 1/4 out), clean air filter, checked the fuel lines, drained carb in case it flooded, i am not the handiest, and have not checked the timing or magneto's myself. could it be the battery or ignition system?

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Try leaning it out gradully 1/8 turn inwards till it starts then fine tune it from there

Posted on Jun 04, 2009

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Hi there. The ''default'' settings are :
step #1 turn the mixture and idle screw all the way in clockwise
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The carb mixture screw may add air or fuel, depending on the model. If the bike will idle it can be adjusted without knowing the factory setting. What you want is the highest idle that can be achieved using just the mixture screw, not the idle setting screw. Start the motor, then slowly turn the mixture screw in. If the idle speed increases, continue in that direction. If it slows and becomes rough, turn the screw back out until you reach the highest idle speed. That will the correct setting for the bike at your altitude.

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Check the fuel level in the float chambers of the carbs, it could be too low! Readjust the float to obtain correct level. Blow out the primary and main jets with compressed air.
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Bike wwould not run today without choke pulled all the way out. yesterday much colder choke only half out then pushed in when warm....bike did sit for 5 yrs. added seafoam and 92 octane fuel yesterday...


You are correct, the mixture needs altering.

Start up with the choke in position were it will start, run a few minutes to warm up engine.

Turn mixture screw all the way in, don't screw hard in (Gentle) could damage screw seating, listen to engine when it starts to faulter gradually turn screw out, listening to the engine sound till she is running smooth on tickover. Reve up quick shut down on throttle, and if setup correctly should return to tick over without stopping. Lucky person.

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Two screws. One for idle mixture, and one for idle.

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Choke is working only has 5000km on bike and once bike warms up it loads up wih fuel and then dies out all ports are clean i tore the carb a part 3 times what should the fuel|air screw be set at.it must be...


It seems the carb/s flooding with fuel and thus it dies, try to reset the float pin and get the correct level of the fuel in the float chamber.
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I have an 1998 xr250. it ran great and very strong up till today when i decided to clean the air filter (it was very dirty). after cleaning i put it in the bike to see how it ran. the bike would hardly...


There are two causes of your problem that I can think of: firstly, it may be that you, even after changing some jets, haven't got the air/fuel mixture right. If i were you, I'd put the standart jets back in, set the needle position to the middle position, and screw the air/fuel mixture screw 2,5 rotations ( 900 degrees) out from fully screwed in. This should return your bike's mixture settings to approximately standart. Then, using this page http://www.dansmc.com/spark_plugs/spark_plugs_catalog.html
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turn the idle screw in and check the setting on the air fuel mixture screw. is the bike all stock?

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