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Aprilia RS125

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S1417
Nitrous Nuisance



Joined: 30 Apr 2014
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PostPosted: 14:34 - 10 May 2014    Post subject: Aprilia RS125 Reply with quote

Hi, I recently posted about my CB125T project but it looks like that isn't going to be finished any time soon and i've read that even when it is finished it may not be the most practical bike for everyday use. So I've started looking for other bikes to learn on instead.

I've read a lot about the RS125s all being great to ride...whilst they last. So i was wondering how true it is that they all blow up eventually?

I've found one reasonably priced locally, it's a 2010 model and has a full service history, hasn't been modified/de-restricted and has had an older owner from new. I'm reasonably mechanically minded and have always helped my dad service his bikes and have rebuilt my own one. I also understand that two strokes need to be well looked after and warmed up properly and would be willing to do this.

So basically, if I'm willing and able to put the effort in to maintain it, would an RS125 be an okay choice or is it still better to stay clear?
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clancy
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Joined: 11 Apr 2009
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PostPosted: 14:41 - 10 May 2014    Post subject: Reply with quote

an RS125 is a perfectly reliable bike provided it is maintained!

if you are fulling willing and able to stick to the maintenance schedule religiously it will not give you any issues

i would also advise rebuilding the top end as soon as you buy the bike, at least then you know it been done and you know for definite the internals are ok, and you know when it will next need doing

they all start blowing up because teenagers buy them, rag the nuts off them and never maintain them, not because they are bad bikes.

buying a newer one, off an older owner is the best bet. its more likely to have been looked after
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S1417
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Joined: 30 Apr 2014
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PostPosted: 07:27 - 11 May 2014    Post subject: Reply with quote

Okay thanks that's good to know. I'm starting to see why they've got a reputation for being neglected. I spoke to one seller last night who informed me the maintenance schedule is wrong and the top end doesn't need doing Rolling Eyes

Should i be put off at all if an after market exhaust has been fitted or will this not effect the bikes reliability?

Also, how easy are they to work on as I'd likely do all the work myself. The engines i've worked on before have both been small capacity honda 4 strokes so would the aprilia be any more difficult to work?
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mikesaa309
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PostPosted: 10:30 - 11 May 2014    Post subject: Reply with quote

being a 2 stroke they wouldn't be too hard to work on, one good advantage of 2 strokes is they have less parts like no valves for example.

Probably the most annoying job would be to remove the fairings to get at the engine. Also bare in mind things like riding position when choosing what bike to learn on. With a sports bike riding position, although I've never ridden one myself, I've heard from sports bike riders that counter steering and slow speed manoeuvres are more difficult.

I would also stay away from RS125's with after market exhausts. More than likely the owner likes to thrash every last ounce of power out of it and most teens don't properly maintain them to be doing that on a daily basis. And also don't by a cheap one. My mate brought one for 450 quid, it was the biggest heap of shit I've ever seen. He spent 6 hours trying to figure out why the electrics won't work and when I looked at it found the fuse had blown Rolling Eyes He ended up selling it, too much work needed to be done, not enough time or money to fix it.
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S1417
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Joined: 30 Apr 2014
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PostPosted: 11:51 - 11 May 2014    Post subject: Reply with quote

Yeah thats a good point, although with the mileage i'm looking to do it'd probably only be once every year/year and a half so I'm not to worried about having to do that.

That was my other concern was how it'd cope on mod 1, especially the u turn. I've ridden one of my dads bikes (cb175) on private land quite a bit and am confident doing u turns and figure of 8s on that but not sure how much more difficult it'd be to do on the RS125?

I think i'm just going to keep looking for one as low mileage and standard as possible and then maybe look at doing the top end soon after just for peace of mind.
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clancy
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PostPosted: 12:02 - 11 May 2014    Post subject: Reply with quote

If you have worked one 4 strokes before it will be very easy for you to work on, very simple engines

As far as mod 1 goes, I would suggest if you want an Rs 125 then get one. When you come round to doing your test use the training schools cg as it will be much much easier to do the maneuvers on

But don't let the thought of the 10 minute mod 1 test put you off what bike you want
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 12:47 - 11 May 2014    Post subject: Re: Aprilia RS125 Reply with quote

Shields17 wrote:
I also understand that two strokes need to be well looked after and warmed up properly and would be willing to do this.


So do 4 strokes. Possibly less likely to suffer sudden major failure, but cams, plane bearings and the like on a 4 stroke will suffer badly if thrashed from cold (and cams will be a lot more expensive to replace than just lobbing in a new set of rings to a 2 stroke).

Shields17 wrote:
So basically, if I'm willing and able to put the effort in to maintain it, would an RS125 be an okay choice or is it still better to stay clear?


Yes they are a good choice. But factor in the cost of decent oil (and if an early one, high octane fuel or retard the ignition).

Being fair Aprilia didn't recommend replacing the rings. The service schedule said to examine the top end for wear at (I think) 8000km. Trouble is that to examine them properly (although you can get a good idea with a simple compression check) you need to strip the top end of the engine by which stage you might as well just replace the rings (or piston and rings).

Doing the top end is easy enough. A gentle afternoons work. The exhaust springs are a pain to get off and pigs to get back on. The Rotax / Aprilia piston circlips (sometimes known as oh shit clips, as that is what you say when they ping across the garage) are very stiff and a pain to get in (but pretty secure when in, unlike some other circlips).

My personal feeling is do the rings at 6000km, and a piston with every other set of rings.

With later ones you probably do want an aftermarket exhaust. Later exhausts have a cat in them and do not produce as much power.

Note that if you use an RS125 for your test you might have hassle with the examiner demanding written proof that the bike is restricted / learner legal.

All the best

Keith
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S1417
Nitrous Nuisance



Joined: 30 Apr 2014
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PostPosted: 13:07 - 11 May 2014    Post subject: Reply with quote

Okay thanks guys, good to know that the maintenance shouldn't be anything too difficult.

Quote:
Being fair Aprilia didn't recommend replacing the rings. The service schedule said to examine the top end for wear at (I think) 8000km. Trouble is that to examine them properly (although you can get a good idea with a simple compression check) you need to strip the top end of the engine by which stage you might as well just replace the rings (or piston and rings).


I've found a bike locally with 15k miles on it and the seller says it has full service history but has never had the piston replaced....So could it be that it was serviced and the piston thought to be okay and left? Or should the piston have been done regardless by this point?


Quote:
Note that if you use an RS125 for your test you might have hassle with the examiner demanding written proof that the bike is restricted / learner legal


How would i go about proving it if i did decide to? I have no intention of de-restricting it but not sure how it'd be provable without dynoing the bike
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 13:36 - 11 May 2014    Post subject: Reply with quote

Shields17 wrote:

I've found a bike locally with 15k miles on it and the seller says it has full service history but has never had the piston replaced....So could it be that it was serviced and the piston thought to be okay and left? Or should the piston have been done regardless by this point?


I would worry! The RS125 has very large ports in the barrel which give the rings a hard time. My Futura snapped the rings at about 6300km from new (and that was about 15 miles into a journey), hence my feeling of doing the rings a bit earlier.

Unless I knew when the piston / rings were last changed I would be inclined to just replace them immediately. Problem isn't so much how much a piston costs when the rings fail, rather the damage a snapped ring is likely to do to a barrel.

Quote:

How would i go about proving it if i did decide to? I have no intention of de-restricting it but not sure how it'd be provable without dynoing the bike


Not sure on the requirements now. Used to be that they seemed to demand a signed note on headed paper from a mechanic / dealer, but that might have changed.

All the best

Keith
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S1417
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Joined: 30 Apr 2014
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PostPosted: 13:41 - 11 May 2014    Post subject: Reply with quote

Kickstart wrote:
Unless I knew when the piston / rings were last changed I would be inclined to just replace them immediately. Problem isn't so much how much a piston costs when the rings fail, rather the damage a snapped ring is likely to do to a barrel.


So would my best bet for finding a bike to be to look for something that's in good condition on the rest of the bike, and seems to be running okay, and the replace the piston and rings asap?
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andy_uk
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Joined: 13 Aug 2011
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PostPosted: 13:44 - 11 May 2014    Post subject: Reply with quote

Shields17 wrote:

How would i go about proving it if i did decide to? I have no intention of de-restricting it but not sure how it'd be provable without dynoing the bike


My bike has the same engine and I had similar concerns when planning to take my test on it.

I emailed the DSA, and got this reply :
Quote:
I have been researching information concerning your Aprilia Classic 125 and have found the specifications on the official Aprilia website.



As you state in your email, the Aprilia Classic 125 fitted with the Dell’Orto PHBL 24 carburettor has a power output of 11kW. If your machine meets this specification then it would be suitable for the category A2 test. You will however require bona fide evidence from a dealer of this restriction when you attend for test.



I went to the guy who does my MOT and asked him if he could write a confirmation letter that the bike is fitted with the PHBL24 carb etc...

When I did my Mod1(s) I only got asked for this proof once, but it was deemed acceptable.
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S1417
Nitrous Nuisance



Joined: 30 Apr 2014
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PostPosted: 13:50 - 11 May 2014    Post subject: Reply with quote

andy_uk wrote:
I went to the guy who does my MOT and asked him if he could write a confirmation letter that the bike is fitted with the PHBL24 carb etc...

When I did my Mod1(s) I only got asked for this proof once, but it was deemed acceptable.


So it's just as simple as getting a garage to give written verification that the bikes stock?
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 13:51 - 11 May 2014    Post subject: Reply with quote

Shields17 wrote:

So would my best bet for finding a bike to be to look for something that's in good condition on the rest of the bike, and seems to be running okay, and the replace the piston and rings asap?


Pretty much yes. If you have worked on bike engines before then I wouldn't worry about how difficult it is to do the rings. Just take your time.

All the best

Keith
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