Question about 2003 Aprilia RS 125

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Not starting off starter but goes with a push

Hi can anyone help? I have recently bought an 2003 Aprillia RS 125 it has been running perfectly and still is. The compression seems fine the bike runs and ticks over without any strange noises. The previous owner used to push start it as he bought it without a starter motor on it. I recently bought a replacement starter motor and then found the Bendix was faulty (Bendix is a separate unit fitted inside the engine on the 125) I got one and fitted it by removing the flywheel. The engine turns over on the button but wont fire up. there is a spark at the plug (which is clean and new the bike starts dead easy with a push (I must admit this has got me scratching my head as the battery is fully charged and brand new) the battery is a Varta 12v 9ah battery (would a more powerful battery help?)

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  • Malcolm Smith
    Malcolm Smith Mar 29, 2015

    The bike actually runs perfectly if bump started I will do a compression test and will also try adjusting the mixture as it does seem to be running slightly rich. The batery I will get checked out as even brand new batteries can be faulty

  • Malcolm Smith
    Malcolm Smith Mar 29, 2015

    Thank you to all who took the time and trouble to help I will try all suggestions

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  • Aprilia Master
  • 40,008 Answers

Hi, Malcom Smith famous dirt bike rider extraordinaire and the usual suspects are:
1. Ignition Switch not in the "ON" position.
2. Engine Run Switch in the "OFF" position.
3. Discharged battery, needs to be 12.5 volts or better and be able to pass a "LOAD" test if necessary.
4. Check the 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.
5. Tip over sensor needs a reset.
6. Faulty ignition switch.
7. Faulty starter button.
8. Faulty kickstand or clutch pull in switch/sensor.
9. Starter control circuit, relay, or solenoid faulty.
10. Main fuse or circuit breaker may be blown or faulty.
11. Check for engine trouble codes.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
APRILIA RS 125
Aprilia rs 125 trouble starting arghhh
RS50 wont start off motor but will easy when bumped
https://www.manualslib.com/manual/363586/Aprilia-Rs-125-Tuono-2003.html
Products at Aprilia Genuine Parts Aprilia Parts Aprilia Spare Parts...
APRILIA RS 125 2006 Manual

Posted on Mar 18, 2017

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

Mitchy123
  • 216 Answers

SOURCE: aprilia rs 125 starting problem

First check the battery to see its still fully charged. If it is do a voltage drop test between the battery and the starter to check for a bad relay or open circuit. If that checks out, you very likely have a bad starter/solenoid. I can explain how to do these tests if u need me to

Posted on Nov 26, 2008

  • 320 Answers

SOURCE: bike wont start

I would check for compression on the cylinders. a engine has to have fuel,fire and compression or it wont run. Check the specs to get the operable compression levels.

Posted on May 27, 2009

  • 64 Answers

SOURCE: 94 yamaha 535 virago sounds fine, just wont start

Check to make sure your getting gas by pulling off the hose, if no gas comes out your petcock is clogged. If this is the case blow air up into the hose, and if gas comes out now your tank has to be cleaned out.

Posted on Jun 23, 2009

  • 1 Answer

SOURCE: 2003 Heritage Starter Problems

I have an 03 FLSTC, same issue. Went through four starters before 70k miles. Problem solved when I had both the gear reduction and compression releases installed. Have 40k miles on my fifth starter and no problems.

Posted on Jul 26, 2009

ollie reece
  • 1167 Answers

SOURCE: I have a 2004 Husqvarna SMR450 always been very

you have too much fuel going into to cylinder if backfiring on carb there are 2 screws one for idle and one for mixture the mixture screw is the one you want turn this in 1/2 off turns or more if doesnt help this picture will help buddye738b4f.jpg

Posted on Sep 08, 2009

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