Aprilia Rs125 General FAQ.

[frostscythe]

This is a post for new riders whom are interested in the rs125 can have simpler qns answered through.

 

1) What is an Aprilia Rs125?

It is a GP derived 125cc class sport production bike made by italian co. Aprilia, Quoted by motorcyclenews.com "It oozes big motorcycle style and handles like a dream" 'The Aprilia RS125 is probably one of the best handling bikes on the planet'

 

2) What's the maintenance like?

IMHO its a very general question, and generally it would cost more than the thai-jap bikes ie. KRR, SP, TZM mainly because the spare parts (piston, conrod etc) cost more and often do not have 'chiong parts' as alternatives, usage of fully synth 2t is highly recommended to keep the top at its best and reduce chances of seizures. Other than replacing of major parts which do not happen freq. if you ride on the street, it is not as bad as how your regular uncles at bike shops tell you it is. Often heard from others ' If you want a hot ass italian chick naturally youd have to pay more '

 

Hows the fuel consumption?

That varies immensely, from lawrence's >30km/l to me hearing of others having 12km/l, but being totally stock, correct me if im wrong, i'd say about 18-25km/l. The FC is affected by many factors including and not exclusively; carb tuning, wear of piston rings, barrel piston cond etc.

 

What its Top speed?

It can be anything but a properly tuned stock de-restricted rs125 should go above 160kmh on the meter. Mine highest ive seen is abt 180kmh(meter) with a 34 carb, px cone airfilter, de-cat exhaust.

 

Which Gen is this Rs125?

From current

2011-2006 - Sharp angular fairings similar to the RSV. Full Digital instrumentation Oz style rims

2005-1999 - Big round fairings five spoke rims, shape similar to 125gp bikes, slope down rear tail.

1998-1996 - Smaller head than gen after it, more squared fairing, has a lower lip below headlight, has a pillion seat grab, 3 spoke rims.

1995-1992 - Similar to 98-96 model, but more squared, noticeable difference is the squared headlight.

 

Is my bike restricted?

Generally older RS' are fully powered, but there are many ways to see if its restricted. Your speed should be able to tell(unless your bikes all beaten up). If it can go to to about 140 it should be de-restricted, if it struggles at about 120 it should be restricted. Things to derestrict : CDI, Rave/Rave2Pneumatic system, exhaust, carb(if you wanna run the 34mm) Read more here:http://www.125ccsportsbikes.com/forums/index.php?showtopic=31334

 

How much HP does an RS125 have?

A fully powered stock RS125 does not have a claimed 33hp. If its brand new and totally de-restricted with a 34mm carb and proper exhaust you might hit abt 28hp at the wheel. For a comparison, the 150sp seems to put out about 28-31hp at the wheel but over a broader powerband due to the bigger cc. This is all read from various sources and i might be wrong.

 

What kinda performance mods should i do?

You could do anything and everything if you had the moolah, But generally as a good start,

1) Exhaust System -after market systems usually make your bike more responsive and rev happy legal ones currently i think are arrow street, and gianelli. There are many other good ones out there like scalvini, tyga, jolly moto, jim lomas. Some are stainless steel and wont rust, look real good too! But remember they are not street legal and its your decision.ALSO GOT LAWRENCE'S special special exhaust ask him more about it, full stainless steel, sounds sweet and seems good at the mid and bottom too hehe Which is the best? opinions vary but this is a good source, must google translate. http://www.rs125.it/public/wiki/index.php?title=Categoria:Espansioni

2) Carburettor - Rs125 usually come stock with a 28mm vhst or 28phbh depending on model. A general upgrade would be to a VHSB34LD or VHSB34 Racing Carburettor (flatslide). Personally the change of carb makes a huge difference to the bikes character, from a prowling cat to a flying puma with a rainbow horn. Okay not like that but its worth to feel the difference in pull and top end if tuned well.

3) Reeds - Reeds are like plastic pieces that move when fuel+air mixture is 'sucked' from the carb. It is a transition from the carb to the crankshaft. Stock ones are seem to be like plastic(not entirely sure) and though they do the job, after market ones help make the bike feel more responsive, as they are more sensitive to the air being sucked in(i hope you guys can visualize lol!) Some brands include boyesen carbon reeds (direct replacement), Vforce 2/3 (slight change of intake tract), carbono reeds etc.

Suspension - Though its not a must, i do think having a good rear/front suspension set up will help you enjoy your ride more. Stock rear shocks die after awhile and are not rebuildable, some after market shocks that are more budget friendly are like bi-tubo which is Spring Pre-load adjustable, or top of the range ohlins which are fully adjustable, compression, rebound, length, and pre-load which are even more adjustable than many litre bikes shocks out there. Other brands include WP, hyperpro, sachs adjustable, wilbur. There are many others. Front fork can also be changed or like getting it done by maxton(fork rebuilds for aprilia superteens) would cost alot, normally changing the fork oil to maybe 15W should make the fork stiff enough and maintaining the cond of the front fork will have you enjoy your ride.

 

There are many other mods you can do, ie SP 3 spoke rims diff carbs, master cylinder and all that but by then you should know enough.

 

 

RS125 Official Service Intervals Chart By Aprilia

 

http://imageshack.us/photo/my-images/853/serviceintervalsrs125.jpg/

 

http://imageshack.us/photo/my-images/853/serviceintervalsrs125.jpg/

Edited August 18, 2011 by frostscythe

[fre3d0m]

Hi do u knw if thrs a diff bw the rs125 2010 model and the 2009 model?

 

From what i heard from MAH, the 2010 version isnt as powerful as there are no valves.

[frostscythe]

there is only restricted and unrestricted, the power valve system might not be in the 2010 therefore the lack of power. come join us in the aprilia forum if you got more qns

[Tjioe Hendrik]

guys,

 

do you know any Singapore supplier that has stocks for Wiseco almunium piston for 2009 Aprilia RS125? Or do you know any better pistons?

[Jehuty]

Why never just put this on Aprilia forums?

[themostestultimategenius]

guys,

 

do you know any Singapore supplier that has stocks for Wiseco almunium piston for 2009 Aprilia RS125? Or do you know any better pistons?

 

The pistons are the same for nearly all years of the RS125 because they all use the same engine. You can try getting a Vertex piston. But be sure to get a correct sized one.

[themostestultimategenius]

Sorry double post.

[assault_ex]

Have anyone on Aprilla RS4 125.. Its the 4 store engine.. Design follow RSV4 1000.. Anyone know the cost??

[frostscythe]

Why never just put this on Aprilia forums?

 

Cause itll be lost in the large amount of pages and then people interested in the bike would not be able to see the post any longer

[WhiteangelRS]

hi peep, I'm gonna collect my 2nd hand 09' RS125 soon... What spark plugs and 2T is recommended??? Thanks guys

[Galvanized]

Does anyone know anything about the aprilia rs 125 09 ver's power valve?

[themostestultimategenius]

Does anyone know anything about the aprilia rs 125 09 ver's power valve?

 

PV is the same for all years with the Rotax 122 engine.

 

BR9EG or BR10EG spark plug. Use only fully synthetic 2T. You can try Agip or Maxima K2.

[zam313]

Hi, what's the best engine oil for rs125?

 

Sent from my R8106 using Tapatalk

[teambhp]

Hi, what's the best engine oil for rs125?

 

Sent from my R8106 using Tapatalk

To me,it's motul.of course, you can choose other reputable brands as well

[zam313]

To me,it's motul.of course, you can choose other reputable brands as well

Thanks. Just cant quite figure if there's any difference between motul, maxima, eni and motorex.

 

Sent from my R8106 using Tapatalk

[teambhp]

Thanks. Just cant quite figure if there's any difference between motul, maxima, eni and motorex.

 

Sent from my R8106 using Tapatalk

Actually their base oils all the same one. It's just that different mfg use their own secret additives

[zam313]

My RS feels very heavy on low gears and the pick up is slow. My bike struggles to get to the third gear and sometimes even on high gears especially with pillion. Even without pillion i experienced the same thing. it doesnt feel smooth even after i change engine oil. any advice? Thanks