SOURCE: I have a 2002 Yamaha
Hi and welcome to FixYa,
Based on your description, bike will start if you spray fuel into the carb, then the carb is not getting fuel. A couple of ideas you may want to explore/check/clean:
Just a start, do postback how things turned up or should you need additional information. Good luck and Thank you for using FixYa.
SOURCE: peculiar way of starting engine.
Need more info...if you have a multimeter connect it to the battery while engine is running? Is it 1-2volts over battery voltage?
SOURCE: Mixture proplem
The brown oil is water mixed into the oil. If I recall correctly the DT bikes were air cooled. The water would be condensation in the gearbox. Just drain the oil and ride more often. If the bike is water cooled the two seals on the water pump shaft are bad. This is not a major repair. The bike probably needs new crank seals. Go ahead and clean the carb as water and trash may have accumulated restricting the fuel flow to the motor. Install an in-line fuel filter.
Use TWO STROKE ENGINE OIL in the pump. If not using an automatic oil pump, then mix the gas and oil 32 to 1. That equals 4 ounces of TWO STROKE ENGINE OIL to one gallon of gas. NEVER use motor oil in the gas. Only two stroke engine oil. Use 10w40 motor oil in the gear box. Don't use any synthetic oils, oil marked "EC", or oil with "special" additives. Stick with the major brands; Pennzoil, Quaker State, Mobil or Shell.
ALWAYS have a fire extinguisher on hand when working on carburetors.
Remove the water trap bowl at the bottom of the petcock, (gas valve). Is there any water or trash in the bowl? Drain a cup of gas from the tank. Is there any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).
Drain the carburetor. There should be a screw on the lower side or bottom of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Try to start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.
Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Remove the idle screw and the air screw on the outside throat of the carb and spray into the screw holes as well.
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Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two adjusters down. Only screw these in until they LIGHTLY seat. Now turn each adjuster one and one half turns outward. Put the rest of the carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine.
If the tank is rusting, you need to seal it up. Google “ kreem fuel tank liner “ or go to www.http://www.4secondsflat.com/Fuel_Tank_Sealer.html
SOURCE: i have a dt 125 field bike will not kick start
try squirting some fuel on the inlet and see if it firse get back to me with results
Testimonial: "will give it a go tried for hour today "
SOURCE: I have a 2001 yamaha warrior and it wont start
It sounds to me like you have a faulty ignition ciol If you are able to borrow one off a mates bike of the same model & try it if you find your machine starting with the borrowed coil get the to a dealership not a wrecker in my expierience( somthirty odd years of it 0 second hand electrical parts will only give you trouble all the best .Geoff
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