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Thread: 06 Aprilia RS125 Broken again :(

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    06 Aprilia RS125 Broken again :(

    Hi All,

    I have a 06 Aprilia RS125, had a friend rebuild the bottom end for me however the first day back riding it again it broke down on me again.
    I don't want to trouble said friend again because it took a year to fix it the last time. It won't start, but when you try and start it, it sounds really dry?? only way i can think of describing it.

    I'm chasing a mobile mechanic if anyone knows of someone please? Really want to get back on the road as I have not been able to ride in a loooooooooooong time.

    Thanks all

    James
    Last edited by jantht05; 22-01-2016 at 07:42 AM.

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    Member Slug_BM's Avatar
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    Hi James. Doesn't sound like a quick fix. It xould be anything from crank seals, reed valves, etc. Any idea as to what failed before the rebuild and what was done for the rebuild?
    It's all fun until someone loses a nut.

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    Quote Originally Posted by jantht05 View Post
    Hi All,

    I have a 06 Aprilia RS125, had a friend rebuild the bottom end for me however the first day back riding it again it broke down on me again.
    I don't want to trouble said friend again because it took a year to fix it the last time. It won't start, but when you try and start it, it sounds really dry?? only way i can think of describing it.

    I'm chasing a mobile mechanic if anyone knows of someone please? Really want to get back on the road as I have not been able to ride in a loooooooooooong time.

    Thanks all

    James
    Derek Ball..

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    I say rebuild but not sure if it was quite that extent? pretty sure it was though. The Crank bearings were replaced and they fixed up my piston chamber.
    Just spoke to Derek and he said go back and talk to the friend about it first. Will try and get in contact with him.

    Thanks all though.

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    Buy Loud's bike. Problem solved 😃
    Likes Supdog, Loud, BikeONE, xor liked this post

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    Quote Originally Posted by Kristy View Post
    Buy Loud's bike. Problem solved 
    The one he's selling? Don't tempt me.

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    Member Loud's Avatar
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    Can you take the spark plug out, put your thumb on the hole, press the starter and tell us if there's enough pressure to kick your thumb off the hole? Yes = it might not be that bad. No = rebuild.

    Why did it need a rebuild the first time?
    What did he do to fix that issue, when the engine was rebuilt?
    How many kilometres has it done?
    Describe what happened when it broke down this time.

    A year is a long time - an interested ans capable person can crank out a full rebuild in a weekend with all of the parts in hand. Last time I tried shopping around the best I could find was $1,600 for labour... which is why I do my own now
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    Quote Originally Posted by jantht05 View Post
    The one he's selling? Don't tempt me.
    Not sure how you'd ever get the one I'm not selling...
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    I need to get on to it myself, i just didn't want to start and not be able to finish.
    I'm finding out exactly what was fixed last time, but i know the Crank Bearings were changed, they machined the piston barrel because it had very minor scores (and re-coated it? whatever it is you have to do) Other than that I'm not sure.

    The spark plug thing i can do easily, will try tonight or tomorrow to get it done.

    And i thought it was you selling a red RS125 on Gumtree? Looks so sexy!

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    Yes, that's mine. I have a second RS that's not for sale

    Let us know about the rough compression test. But also try and describe how it happened this time - were you at high speed, did the rear wheel lock, noises etc. It'll help tell if it's going to be a top end rebuild or a full rebuild.
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    Quote Originally Posted by Loud View Post
    Yes, that's mine. I have a second RS that's not for sale

    Let us know about the rough compression test. But also try and describe how it happened this time - were you at high speed, did the rear wheel lock, noises etc. It'll help tell if it's going to be a top end rebuild or a full rebuild.
    Was riding down the freeway, pulled on to the off ramp and stopped behind traffic (First mistake)
    Gave a little throttle to roll forward to move up and it literally just turned off or died. Then wouldn't start again, no noises or loud bangs this time. Wheels kept turning when i wheeled it off the road though. Can't hear any noise coming from the piston when i move it (which is did the first time it broke down). It felt and sounded fine from what i could tell going down the freeway.

    Actually! I did get off one ramp early because the check engine light was coming and going, but I remembered last time that happened it was just the sensor next to the spark plug that was a bit loose.

    Does that help at all? :/

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    Could just be a fouled/burnt plug. Do the test, replace the plug if there's compression, let us know.
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    Oh and that sensor measures your water temperature - it's a little useful in working out if you're cooking your engine so crimp it on with pliers.
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    Quote Originally Posted by Loud View Post
    Could just be a fouled/burnt plug. Do the test, replace the plug if there's compression, let us know.

    Had compression so replaced the spark plug but no different. If i can figure out how I'll post a video or something with the sound it makes trying to start? sounds pretty horrible.

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    Was there enough compression that you couldn't hold your thumb on top, because it gets pumped off?

    And it wouldn't start? Or it just sounded like it squeeled when you held the starter?
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    Quote Originally Posted by Loud View Post
    Was there enough compression that you couldn't hold your thumb on top, because it gets pumped off?

    And it wouldn't start? Or it just sounded like it squeeled when you held the starter?
    Might be a bit low on pressure, my dad has a pressure tester some where so will give that a go tomorrow. And no wouldn't start, it makes a hell of a racket trying to though.

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    So i did the test again, definitely not enough pressure to push my thumb off. Also got a pressure tester on it and only got 30psi.
    I just took the spark plug out, put the pressure gauge in and tried to start her (assuming this is the correct way to do it).
    Also i'm no mechanic but i'm guessing 30psi is bad?

    oh also, when i try to start it (when it's all assembled), it slightly pulls forward like it is trying to start. Any clues please? If i can fix it myself i would love too since i already have the tank off haha
    Last edited by jantht05; 23-01-2016 at 01:38 PM.

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    30psi is bad. Pretty sure mine puts out 160psi.

    So the piston has seized at the very least. You may get away with a new one, or it may have scored the barrel - meaning aluminium is also likely to be in your main bearings and crank. That means you're up for a full rebuild.

    Plus you need to establish why it seized. Why did the engine need a rebuild last time?

    As for fixing it yourself - buy a Haynes manual and see what's involved. It's not hugely difficult if you have the right tools and know how.
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    Quote Originally Posted by Loud View Post
    30psi is bad. Pretty sure mine puts out 160psi.

    So the piston has seized at the very least. You may get away with a new one, or it may have scored the barrel - meaning aluminium is also likely to be in your main bearings and crank. That means you're up for a full rebuild.

    Plus you need to establish why it seized. Why did the engine need a rebuild last time?

    As for fixing it yourself - buy a Haynes manual and see what's involved. It's not hugely difficult if you have the right tools and know how.
    Excuse the noobness, but the piston was moving when i was trying to start it (could see it). Thought if it were seized it wouldn't move? Or just moves less..

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    Heat causes seizure. Heat occurs either through:
    • the combustion chamber running too hot (lean mixture - jetting or air leak)
    • too much friction (too little oil, piston too big for cylinder/cylinder replated to the wrong size for the piston)
    • insufficient cooling of the water jacket

    A light seize will usually smear the ring lands on your piston, pinching them in so that they're no longer sealing against your cylinder wall. No seal = no compression. Once the piston has cooled down it'll go up and down the barrel again.

    Now that I've answered your question it's really pretty important to answer mine: What happened last time for the engine to need a rebuild?

    Essentially if you can't answer that question and rectify the issue, you'll just keep seizing engines and having to rebuild them.

    If you're looking to rebuild it yourself then the next step is to take off the cylinder head and see if your bore is scored.
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