Question about 2002 Aprilia RS 125

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RS 125 Engine Tapping Sound

I recently bought a RS 125 and it sounded fine... i have never owned a bike before so i got a freind to go with me to check out this private freind told me the bike was fine and didnt miss a beat when riding it, however, the engine is now making a tapping sound and theres quite a bit of white smoke coming from the exhaust. The tapping sound is pretty loud and getting more noticable...could someone please tell me the possible cause of the problem, how difficult it is to repair and how much it would cost roughly. Any answers would be a great help. Thanks in advance.

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  • naveed247 Jun 28, 2009

    thanks for the help, do you know roughly how much it would cost be if what you said is correct? I mentioned in my other post that the bike was letting of a bit of white smoke for the exhaust, well over the past couple days the bike has been chucking out loads of it, i let the bike warm up to temperature but if i dont keep the revs above 2k it dies so i have to hold the throttle to let it warm up, however it dies anyway. Any Ideas? Thanks

  • naveed247 Jun 28, 2009

    I spoke to a mechanic on the phone and they said it sounds like a problem with the water pump, im going to take it to the garage this week il let you know if the coolant is the problem. Yeah iv got a feeling a big engine problem is going to arrise soon. My local garage quoted me around £80 to open the engine and tell me what needs doing. I think im going to sell the bike anyway its a bit to unreliable for me. Thanks for your help, greatly appreciated.

  • Anonymous Mar 15, 2014

    would a plug cause a miss



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being a teo stroke these engines dony last long the aprilia has a high engine fail rate the noise is most prob the big end or small end bearings as these are common to go on this bike the main bearings make a rummbley scraping noise on idle best to get it looked at as when these go bangh thay can destroy the crank case too
cheers jay

Posted on Jun 27, 2009

  • jason burgess
    jason burgess Jun 28, 2009

    hi the last one i rebuilt cost £500 as needed crank case, crank rebuild, piston kit and main bearings

    the white smoke can be coolant being burnt or if its bluey white it could be drawing the oil from the gear box from a seal which could mean the main bearings are worn these bikes need a good syn/two stoke oil the best you can get as the cheep stuff will make the engine wear twice as quick

    as these bikes are not slow that seem to get a lot of abuse so when you buy one second hand its had it neck rung already there is two types of engines a 122 and a 123 both are diffrent and the parts are not cheep

    ive got a 04 plate engine with 1500 miles on it a 122 engine

    hope this helps

    cheers jay


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It could be a problem with the balance shaft gears. Mine did the exact same thing, and I immediately had a semi-stroke thinking it was the bearings, because the bike hadn't been driven nowhere near the mileage those are supposed to last.

If the problem isnt found anywhere else, id get the gears replaced anyway while looking at the wpump. They are made out of plastic and when they do go, they take every other plastic gear thats around them (oilpump,waterpump) with them. The gears themselves arnt that expensive.

Posted on Jul 24, 2009


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