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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My Harley is very slow to warm up, it also does not like to idle without choke unless it is good and warm. It could be the clogged filter was acting like a choke, but ruining your gas mileage. Now with air flowing smoothly the engine needs a bit of choke to idle. It should not need choke once it is fully warmed up unless your idle speed is set too low. With the engine hot, check RPM if you have a tach. If too low, adjust the idle speed at the carburetor. I suggest you find the adjustment while the engine is cold.

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Won't start

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.
Hope you adjusted the air screw mixture at the right temperature of the engine i.e. you need to warm it up and than adjust also check the valve clearance of the engine.
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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 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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Fuel Mixture Ratio Is it - 25:1 40:1 50:1

not sure if yo are changing the jets out but if your using the original screws and jets screw both screws in till they stop then turn 1 and a half turns out they try starting if it kicks and won't run then turn each screw another 1/2 turn out try starting if it runs rough adjust the gas jet a little bit till it runs smooth once it warms up give it full gas and you should get just a slight puff of black smoke to be set right, if it's too lean it will get hot and will be hard to start if it dies, if that happens then give it extra gas. once warmed up it should idle without dyeing if it dies adjust the idle screw up 1/4 turn at a time till it runs at idle without holding the gas trigger, be sure you replace the in line fuel filter and fuel line first then clean the air filter before doing any adjustments. most problems are caused by plugged fuel filter due to ethanol in the gas.

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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
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I have a 2003 Yz 250F. I start the bike and warm it up and push in the cold starter knob the bike will not Idle. please help.

turn the idle screw in and check the setting on the air fuel mixture screw. is the bike all stock?

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