Question about 2005 Aprilia MX 125

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Flat spot hi on my 2006 aprillia mx 125 there is a big flat spot on pull away and have to be carefull not to stall the thing some times. Once the clutch is engaged it rides perfectly. its totally standard and not been played about with to my knowlege. Also i cant engage full power in 1st if its not 100% "warmed" up i guess and finally (sorry) i have a small oil can pic come up on my dash. theres plenty of 2 stroke oil and fluids and shouldv bin serviced not that long ago. phew thanks guys!!

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Remove the water trap bowl at the bottom of the petcock, (gas valve). Any water or trash in the bowl? Drain a cup of gas from the tank. 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 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. Install a new stock NGK spark plug and 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 two screws on the outside throat of the carb and spray into the screw holes as well.
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Put the rest of the
carb back together, clean the air filter and install the carb. Before putting the slide and jet needle back in the carb body, move the clip on the needle down one notch. This should eliminate the flat spot and pre-warm up problem. Let the float bowl fill then start the engine. This process should get you back on the road.

Change gearbox oil. 10w40 motor oil is what is needed. The oil can light may be a bad sensor.

Please rate this solution. Thanks Giles! :)

Posted on Apr 15, 2009


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