Question about 2003 Aprilia Atlantic 125

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My Aprillia sr 125 cut out on me as i was riding along, i pulled it into a layby and now it won't start i have changed the spark plug and still nothing please help???

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  • Aprilia Master
  • 43,660 Answers

Hi, Gemma22839 the following applies to carbureted also fuel injected models and the usual suspects are:
1. Severely discharged or a damaged battery, 9 volts or lower.
2. Faulty alternator/generator and or voltage regulator.
3. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
4. Faulty main circuit breaker or ignition switch, check for loose connections and continuity.
5. Faulty system and or ignition relay, check for continuity.
6. Faulty ignition coil, ignition/electronic module.
7. Faulty CKP, CPS, CMP, MAP, TPS, O2, or BAS sensor, corroded, loose or broken wire connector pins/sockets.
8. Water or dirt in the fuel system, carburetor or filter.
9. . Restricted, blocked or kinked fuel line.
10. Fuel tank empty.
11. The gas cap is not venting properly or fuel tank venting system blocked.
12. A faulty Fuel Pump, pressure regulator and or fuel injectors.
13. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
14. Needle and seat stuck closed in the float bowl.
For more information about your issue, please visit the websites below. Good luck and have nice a day.
DOWNLOAD 2003 Aprilia Atlantic 125

Posted on Oct 27, 2015

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Posted on Jan 02, 2017

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DickCanFixIt
  • 948 Answers

SOURCE: engine cuts out

It sounds like something is preventing the bike from getting fuel. Check fuel filter, fuel tank vent, air filter too. If you have vacuum building up in the tank, letting the bike sit for a few minutes slowly releases that vacuum allowing the pump to pull fuel easily again for a bit. Next time the bike quits open your fuel tank. If you hear a whoosh of air being sucked in look for a plugged vent line. A plugged air filter can have a similar effect but the only way to check that is change the air filter or look at the one you have. It would have to be really, really dirty or plugged with some debris to cause this problem.

Posted on Mar 01, 2009

  • 3567 Answers

SOURCE: I HAVE AN OLD YAMAHA SR 125 ITS REVS GO UP AND

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. Let the float bowl fill then start the engine. Set the idle speed with the idle screw. This process should get you back on the road.


Since you mentioned uneven idle revs, be sure the carb and manifold are on tight and also tighten the cylinder and head. Air leaks can screw up the idle.

Please rate this solution. Thanks speedfreak41

Posted on Apr 04, 2009

  • 11 Answers

SOURCE: aprilia sr 125

if its the same problem i had if you have been runnin it wit the oil low its cz there wil be an air bubble in ur oil pump which is causing it to slightly seize just a sugestion flush the oil pump n good luck i hope this solves it

Posted on Aug 30, 2009

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