help needed i need to know how you tell if the bike in question is the full power version as im a little confused wit alot of the write ups on these machines they say they are learner legal but if its the full power version you must have passed your test first is this correct how do i tell 
  plz help as im looking in to getting one and dont want to get knicked 
    as i dont hold a fill bike licence yet 
    caitlin                                                                                                                                                                              

THe RS can produce in full power upto about 30 bhp so technically it wouldnt be learner legal. Unless its a fairly new one then it will be producing around 12 bhp if its restricted (one way to tell is that it will top out around 70 mph - a full power one will do over 100mph)   Officially yes - you would need to pass a test to be able to ride a full power version, whether most people would realise its full power if you were on it with L Plates is another matter.   The full power version will probably have less low down grunt than a restricted one though.   As for how they are restricted - I don't know sorry. Yamaha TZR125 was restricted by not having the power valve working abd set to "low tune" direction Honda NS125R was more with the electronics   Some do it through the exhaust as well, or you need a kit to convert them to full power.                                                                                                                                                                             

http://www.125ccsportsbikes.com/forums/index.php?showforum=9

You should be able to locate all the info you need in there

CDI Derestriction
The Aprilia RS125 comes with a CDI restriction. It retards ignition around 6000rpm so the bike can pass EU emission tests so they can be manufactured. This makes your bike perform very poor at 6000rpm and does not let the engine pull. Derestricting this will invalidate your warranty. If you bike is in warranty the best thing to do is buy another CDI and derestrict this and use it on your bike.

Derestricting the CDI?The CDI is a black box under the passenger seat. Therefore to get to it you will need to remove the tail of the bike. The easiest way to do this is to remove the rear side fairings with the tail. See the manual for more details.
The CDI will have a serial number on it? if the serial number is in the following format 071000-XXXX-XXXXX then this derestriction will work if done correctly (may still work on others).

You will need to cut out a hole in the CDI to reach the bridge. Cut out a rectangle 30mm by 10mm and 5-10mm deep.
http://flexiweb.atspace.com/rs125/1.jpg
You will see a part of a circuit board, snap this. This is known as the bridge. (If you reach glass it means you have dug too far!)
Once you have snapped the bridge, fill your hole back in with silicone, make sure its waterproof! Now there will be no environmental dip between 5000-6000rpm.

Here is a detailed diagram...
http://www.angelfire...di-instruct.jpg

Full Power Derestriction
The Aprilia RS125 can be restricted so its learner legal, and then derestricted to full power (claimed 33bhp). To do this you will need the following items:

o RAVE controller
o Powervalve blade
o Solenoid
o Cable

If your RS125 is restricted then it will not get a significant power increase around 8000rpm. If you know the powervalve is installed but you are still not getting this increase ensure all parts are working correctly, connected, and the solenoid is set correctly.

What does the powervalve do?
The blade of powervalve goes in the barrel of the engine. This then moves up and down to increase and decrease the exhaust outlet size to give you different performances at different rev ranges. The more revs you give the bike the more the powervalve blade is pulled by the solenoid and opens the exhaust outlet.
All a solenoid is, is an electromagnetic componet. Bbasically all you need to know is it pulls a cable which is connected to the powervalve blade to pull it out to increase the gap in the exhaust outlet.


You must check your bike for the componets listed above.
Your bike may be restricted via a blanking plate. You can see this by removing your right side fairing and looking above the exhaust. It will be a small plate and have 3 bolts along it (one either side and one in the middle). If you see a blanking plate then you will need to purchase the powervalve blade, mount, and other parts see parts diagram below... Your probably best getting a gasket for it too even though there is one on the blanking plate... you can reuse them but to ensure the bike performs well and you dont get any problems get a new one...
http://flexiweb.atspace.com/rs125/2.jpg
Once you have aquired these parts remove your blanking plate and fit the powervalve into the bike.
Note, the powervalve goes in one way!
It has a tapered end on one side, this should face downwards, and the flat side of the powervalve blade should face upwards! Ensure you do this!
http://flexiweb.atspace.com/rs125/3.jpg

If you can see the powervalve mount sticking out the exhaust then you will not need to purchase it of course and you will see something like this above the exhaust...
http://flexiweb.atspace.com/rs125/4.jpg

Remove your tank...
To the right of the battery there should be a solenoid which should have a cable connected on the end of it. The cable connects to the powervalve blade that goes into the engine that we looked at before.
It should look something like this altogether...
http://flexiweb.atspace.com/rs125/5.jpg
If you do not see the solenoid and/or cable then you will need to purchase these.
Once you have purchase these parts mount them to the right of the battery, there is a place for it to be fitted, it goes on the part of the radiator frame that goes right next to the battery.

If you see the solenoid and cable, and you see the powervalve mounted in the engine but your bike is not performing as it should... then it may be a case that the solenoid is not connected! If you look on the picture above there is a connector block on the end of the solenoid, see if this is connected, it connects to the main loom which runs along the right hand side of the bike from the front all the way to the back of the bike.
If you connect it up and it does nothing then keep reading....

Remove the passenger seat and check for the RAVE unit. (just remove the two back side fairings and tail)
http://flexiweb.atspace.com/rs125/6.jpg

If you cannot see this, then you will need to buy one of these and fit it to your bike. There will be a spare connector block coming out of the main loom were it should be connected to. Once you have fitted all these parts your bike should be derestricted!!!

All you need to do now is to set your solenoid up correctly... It has adjuster nuts on it, so the cable can be adjusted. This is because the solenoid starts acting around 3000rpm (you can see the solenoid opening when you rev the bike to this with the tank off). The more the powervalve blade sits in the exhuast the better low range power you will have, but poor top end. This works vise versa. See how to adjust your solenoid below...
http://www.125ccsportsbikes.com/forums/uploads//post-9-1093176496.jpg

WARNING: WHEN YOU DERESTRICT YOUR BIKE YOU WILL NEED TO CHANGE YOUR SPARK PLUG OTHERWISE YOU WILL BLOW A HOLE IN YOUR PISTON. Despite what the manual says, the spark plug to use when your bike is full power (powervalve installed) is a BR10EG. This is because the plug is colder. When your bike is restricted you should run a BR8EG. You can change these plugs for other versions e.g. Denso plugs, Iridium plugs for smoother running.


Exhuast Derestriction
The later bikes 2003 onwards have a CAT in the expansion chamber. In the expansion chamber not the end can. To get rid of this CAT which makes your bike perform differently, get an after market expansion chamber (best buying the end can with it) or buy an earlier expasion chamber from an RS125 or take the expansion chamber off and be prepared to cut it open, remove the CAT and weld it back together.

If you are going to buy a different expasion chamber then you will have to rejet your carb. The bikes with a CAT in them are set to run rich (more oil) because the CAT requires the bike to run like this. Therefore you will need to buy a standard main jet for your carb. If you have a 28mm carb (finally got it right I normally say 26mm) then your standard main jet size is a 120. If your carb is a 34mm your main jet is more likely to be a 158(i think) You can get these for a couple of quid. This means taking your carb off and removing the old main jet, and replacing it with a new one.
The racers tend to use the standard expasion chamber because it is thicker then aftermarket ones therefore contains the heat more, and these work better with more heat. They normally just change the end can.

Removing your CAT (if your being a big man)
You will need to take your expasion chamber off the bike (see manual if you dont know how)
You need to cut your expansion chamber open where this fella is cutting it and where the white line is indicated...http://flexiweb.atspace.com/rs125/7.jpg

Once you have done this you will be able to remove the CAT
http://flexiweb.atspace.com/rs125/8.jpg

Thats it really, dont know too much about it because I havent done it... Just weld your expasion chamber back up with the CAT removed, give it a respay (heat resistant of course) because they tend to rust like hell even if you dont ride your bike in the wet.
http://flexiweb.atspace.com/rs125/10.jpg
The expasion chamber doesnt really have anything in it anyway if your thinking this was too simple. Literally just cut it open, remove the CAT and weld it back together.

Some exhausts also have a recirculation tube that goes to the air box. You just have to cut this off and weld it up and seal up the air box.
The snorkel in the air box can be taken out too, this will let some more air in slightly and make your bike sound a lot better. Just pull the rubber out the top, or you can cut the part that sticks out. This shouldnt affect your jetting since the bike is not jetted correctly from standard anyways. If you want to be sure stick a bigger main jet in (121 on a 28mm carb). Do a plug chop to confirm. To do a plug chop see the pinned topics... under useful RS125 information.

Carbouretter
The older bikes had a 34mm carb on. The new ones have a 28mm carb. I think it was the 98's that had the 34mm carb on then after that unless modified it was a 28mm carb. If you want better mid range power, and a better top end without affecting your petrol consumption too much get a 34mm carb. The petrol consumption is suprisingly good, it does guzzle more but you get that back in power!

All you have to do is get hold of a Deloroto VHSB 34MM and a new inlet manifold because the original will be to small and then fit it onto your bike. The standard air filter will still fit this new carb.



Well thats basically it. Your bike is derestricted...
Mods to follow to make your bike faster and all round better performance... .
                                                                                                                                                                             

so its not that noticable to the naked eye that its been de-restricted but on the other hand is it worth the risk with my tracj recorde of passing my test it might be lol                                                                                                                                                                             

caitlien   Personally I don't think it is worth the risk. If you were involved in an accident and the insurane company find out the bike is the full power version. They will not pay out. This could result in personal financial liabilties as well as points on your licence.   If there is confusion as to whether the bike you are looking for is restricted or not, but from a dealer and check the logbook for power rating. Kw or BHP. Then get the dealer to cerify that if it is a used bike.                                                                                                                                                                             

Just to add that the RS may not be the easiest bike to pass a test on - I know its a 125 but its still pretty much a race rep (and I have a soft spot for little strokers anyway - no innuendo intended lol).   turning circle and high saddle would make it awkward for low speed manoevures such as U turn - not having a go at your ability though - I had an NSR125 when I was getting ready for my test - although the CDI unit failed and I had to take it on a Suzuki 100 but was damn easy to ride compared to the Honda.   Good luck with the test when its comes up though :-)                                                                                                                                                                             

I'll go along with that.   I can see the appeal of the Aprillia, a great looking bike, but taking your test on an easy bike has got to be best. When you have past your test you will be itching to get something bigger. Get something like a Honda CG125. I bought one for practicing and the test and sold it a year later for the same money. OK CG 125 or similar is not practically sexy, but who cares once you have your licence.
                                                                                                                                                                             

As said before take your test on a bike that is easy to ride and then half your test is passed as for the aprillia it uncomfortable and not a good bike for a learner with the insurance cost pass then look at a sports bike sv650 are good start point and one not to high on insurance restricted will sit at 80 all day if your back can take it

thanks guys for your reply s point taken on the stupidity of riding a full power version when not actually being aloud to by law i wont be doing that. thanks again for all your info and happy biking 
   caitlin x