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.
< < READ CLOSELY > >
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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Hi I have brourght aprilia mx 125 full power model and on Tick over the revs drop and it cuts out also When Riding it sounds nice then sounds like its missing and when full throttling it powers on then...


Just bought Aprillia mx 125 2006 and had the same issue. Today carb came off and cleaned in petrol then air lined the jets. Whilst carb off have a look at the reed valves, clean also. I removed the SAS valve and uprated air filter and check your rave valve cable and solinoid. She runs great cant wait to get arrow exhaust now. Try wareham Aprillia and ask for Ivan Pearce, he is a legend helped over the phone loads. Call 01929 554580 dont give up on her fantastic bike to ride7_17_2014_1_07_32_am.jpghttp://www.warehamaprilliaspecialist.co.uk/

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Aprillia mx 125-v hard to start


dear hard to start first thing to do is to install a new plug and second make sure your choke system is working. you could try to prim the engine by squirting fuel in spark plug hole if fires up right away you have choke problem. that would mean a carb cleaning.

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You probably know this but... when you put it into gear you don't have your kickstand down do you. There is an automatic shutoff on the kickstand.

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