Aprilia Riders

[priller07]

Maybe next time I would wanna learn how to pop a wheelie..

Then slap on a bbk, p-plate and pop one right at orchard road

 

Hehehe.. Forgive the intrusion, but if i recall correctly u did pop a lil wheelie waay back at 'secret place'. Me, SubZ, Chung also saw it. Hehehe...

[shinya]

The rave unit can be easily altered to open at 6.5k ,7.5k compared to stock stock 8.25k rpm. How to acheived a balance system for max power output if valve is to be open at 6.5k w/o building up enough back pressure for sufficient recharge for higher rev , is the interesting question?

The 2T engine works in such a way that the exhaust pressure run into the pipe will generate the wave to push put the waste also help to suck in the fresh air/fuel mix. However with same pipe the wave can not match up the big range of rev which requires different time of wave. Given bigger exhaust holes will help the high rev but leak too much at low rev so the valve system had been developed to block the exhaust hole at low rev to generate proper back pressure to conpensate the power lose at low rev. There's no such a thing as build up back pressure from low rev, this is not working as KERS system at prius or F1 cars. Trying to check those NSR 150 race bike which even dun have any electronic system on, the valve motor had been taken off and the valve had been fixed at fully open position cos they dun need low rev on the track and they have very nice high rev power with proper high-rev spec pipe.

 

The same control can be done both at exhaust side(ie, RC valve/YPVS) or intake side(ie, ATAC valve/YEIS).

Edited May 15, 2010 by shinya

[shinya]

Noooooooo...

 

It is an excuse..

 

Who would need so much power / torque on the low end?

If you're into poppping wheelies at yishun dam or infront of the tp bikes camping under the bridges on a hot sunny day then maybe lah..

 

Maybe next time I would wanna learn how to pop a wheelie..

Then slap on a bbk, p-plate and pop one right at orchard road

If you have same power at 7-10k rpm, why bother rev up to 10-12k? Everyone here so good at keep the bike at high-rev power band or so dare to rev the bike meh? Bigger piston for sure limit the rev cos it's havier, but it can be regain if you can find some light weight piston. And also I doubt with LTA approval pipe can dig out the full potential of polini kit block. Put a small 125cc pipe to a 154cc block for sure it can't breathe nicely and this will affect the power cruve so much.

 

2T pipe/carb maybe the most important thing to do with power, if these two can't match then it will be hard to set a good bike.

[IZECUBEZ]

Hehehe.. Forgive the intrusion, but if i recall correctly u did pop a lil wheelie waay back at 'secret place'. Me, SubZ, Chung also saw it. Hehehe...

 

=(

 

Secret is out...

 

Yes yes, I pop wheelies as I please

[Draka]

=(

 

Secret is out...

 

Yes yes, I pop wheelies as I please

 

wow ,sound so Cool !

[themostestultimategenius]

I have all the thing you want on hand.. Pm me if u need anything .. need to clear my room abit

 

You collecting parts or are you starting your own business? Do you have a Wiseco piston on hand? How much are you selling it for if you do?

Still haven't started. Need to wait until next week when my friend books out from Tekong so I don't have to take the bus home from the workshop No time to get it done by myself and with my father (He even suggested to get a new block & piston + conrod + crank etc. forged and then turbocharging the engine NB not like him got so much money to do this kind of bo liao thing on such a small engine).

 

Infinite combinations of parts are possible but are only limited by our knowlegde , $$$ and access to parts for different setup

 

There is more than BBK, exhuast system,carb , Vforce3, HPI to achieve good balanced system..

 

Perhaps you could enlighten us on other ways of doing such things. I know there're other tuning methods but I don't think anyone here can do it. Reshaping the exhaust, inlet and transfer ports and raising the compression.

 

Jolly Moto has been around for a few years now. I've seen a few and have gone head to head with some. They're good.

 

The Arrow/Gianelli system, however, is more of an all-rounder, like the Swiss army knife of exhausts. Its got a good compromise of low end torque to high end power, so generally your ride is pretty smooth and top end is not bad.

 

 

 

The BBK's rev ceiling limitation is not in the porting, but in the laws of physics. BBKs changes the size of your bore, but not the stroke. You can generate more power at lower revs due to the larger displacement, but with a larger bore you'll need a shorter stroke.

 

At high revs, the larger piston has to travel the same length as a 125's, so does the conrod, and this places more stress on parts originally designed for the stock piston and cylinder. BBK means larger piston, which means more mass moving at the same stroke as the 125, which usually translates to more vibrations that BBK riders complain about.

 

This means that BBKs are practical for riders who never intend to ride to the bike's limit, nor wish to push the revs above 9,000rpm thereabouts. In the last 8 years I've gotten to know many BBK riders. Most have had their engines die on them within 3,000km of installing the BBK, because they insist on keeping the revs high.

 

The BBK is not incapable of reaching maximum rpm. But just note that if you intend to keep the revs up there for extended periods of riding, be prepared for premature conrod breakages, piston seizures, and bearing deterioration. FACT.

 

Can't say you haven't been warned...

 

 

 

The valve isn't really a boost. It ensures that we have optimal pressure by varying the size of the exhaust port at different rpm. 2-stroke engines suffer from power loss outside of its powerband when the pressure conditions are not right. The powervalve compensates for this.

 

Having the valve opening early will only cause a drop in power.

 

Yes, that's very cautious riding. Just to illustrate my point on having enough pull for acceleration and overtaking, like at 0:30, 2:28, 3:38, to name a few...

 

The rider used to ride a lot faster, max speed at max revs from Point A to Point B, rain or shine. No exceptions.

 

I just found out that the Jolly Moto pipe is not LTA approved, so that idea has gone down the drain. Are there any Jim Lomas pipes around here? It's a twin pipe like the RS250's.

 

Ah, I see. Thanks for the explanation.

 

I know the valve is to change the size of the exhaust port at various RPMs. There're some people who have their valves pegged open. They say they get better low end but lose their mid range.

 

He's lucky to be alive

[shinya]

Haha... It's not really an excuse. It's fact. That thing is unreliable as hell.

 

Reliable or not, it is not a news that racing part won't have warranty

 

Try to get a HRC RS125 or even Dream 50 see if you got any warranty anot

 

Plus, who the hell will know the mech install the block and set it correct anot?

 

Like chung's polini, can anyone said it seized just because the design failure?

 

Some cases in car even you do service at outside shop where the mech not receive factory certificate you car lose warranty

 

 

In some other cases I've seen ppl riding RS125 with polini kit for years still strong and can pull some where around 37ps on the wheel

 

It's the block pick the owner, mech here sucks or really this block just like ****?

 

There must be a logic way to analyze it

[xxes123]

You collecting parts or are you starting your own business? Do you have a Wiseco piston on hand? How much are you selling it for if you do?

 

 

Me and some of my RS friends who are not inside the forums usually band together to buy in bulk to cut cost, so usually we will buy a few extra.

 

I knew a few shops very well and normally they will inform me if there are any new parts , incoming shipment etc and will offer us a reasonable price of our order size and our confirmed pre-order

 

sorry i dun have a Wiseco piston, mine a Wossner..

[kindako]

Any 1 been to sporting b4??? at kaki bukit auto bay i think.. heard that a mech called ming tong is there and rumors says he's good at fixing RS..... and do u guys know where can i get BBK and the 34mm? Thanks....

[kindako]

and what chain are u guys using? any suggestions?

[Draka]

Any 1 been to sporting b4??? at kaki bukit auto bay i think.. heard that a mech called ming tong is there and rumors says he's good at fixing RS..... and do u guys know where can i get BBK and the 34mm? Thanks....

 

u can Pm xxes123 , he have all the stuff u wanted and is a standard as u order over the net ...leave him a msg if u really interested

[kindako]

is the chain on the rs same as other common bikes like sps and krs?

[Draka]

I Saw a aprilian at yishun near MRT at 10+pm , wanted to wave to him but somemore he ride more and more faster ,the paintwork is like chung's ,

[kindako]

red and white?

[kindako]

any advise on where should i get the kit fixed?

[Draka]

red and white?

 

im not sure but his wearing a black full face with rossi design at the back of the helmet

[Draka]

any advise on where should i get the kit fixed?

 

First u gonna check the price and get it den u go over to First Motor and look for ah seng to get it fix and proper tuning =)

[quikslvr]

 

 

 

I just found out that the Jolly Moto pipe is not LTA approved, so that idea has gone down the drain. Are there any Jim Lomas pipes around here? It's a twin pipe like the RS250's.

 

 

Jim Lomas n Jolly Moto pipes are not approved here.so if u wanna play safe,get Arrow/Gianelli

[Rider125]

is the chain on the rs same as other common bikes like sps and krs?

 

i have this same question..

is the chain and spockets all same for our bike and

other 2b bikes?

[xxes123]

i have this same question..

is the chain and spockets all same for our bike and

other 2b bikes?

 

our is usually a 520 pitch.. kr/sp are 415/428 pitch

[Sub Zero]

High revs is what the bike is made for. The Polini big bore kit was originally made for the SX125, which would give the scrambler more low end torque, instead of having to wait till the revs were high enough to pull. By then, it'd be too late for you to clear the mound, jump, or hill. Some smartass figured to fit it onto the RS125, and next thing you know, it spawned a whole new generation of dreamers wanting low end torque on the RS125.

 

I ride with my revs within the 8,000-12,000rpm powerband most of the time on the move. Only when moving off from traffic lights is my bike chugging in unfamiliar territory below the 8-12k rpm range.

 

Our bikes don't have flat spots, IF YOU KNOW HOW TO RIDE THEM RIGHT.

 

I agree, stock has enough low end torque. Enough for me to move off from a stationary position. After that, my bike runs at full power with my powervalve open all the time. No flat spots, no power lag, with enough pull for overtaking. Want proof?

 

All in a day's ride. Sorry guys, video's not very exciting cos the rider had to ride slower and more safely than normal since he doesn't have any demerit points left to be deducted.

 

 

Seen this vid before. But how do you know the rider is riding a class 2B sportsbike?

 

Lawrence, u got the cam. Mount it on your tank, so it shows your clocks while riding and give us a demo ride so we can all see..

 

I agree our bike will not have flatspots IF they are ridden the right way. But that would mean riding the bike in the powerband only which is not very feasible in everyday traffic conditions for an average rider.

[Sub Zero]

I dun see why one bike can't be street and track ready? You dun need to put tons of upgrade parts and extreme tuning to make it track ready. An engine with good setting should be good response, reasonable power cruve and all these based on good fuel efficency with reasonanle A/F range. The only things I can see the different between on street and on track is the spark plug and little bit more 2T %. BBK or not is not an issue, even OHV engine ppl make them race machine. There will be a solution to settle everything, just need to find the right guy and have good feeling about what's going on under your ass when you riding her and capable to translate to your mech. This feed back will help you shape up your bike to suit your riding pattern or the bike will shape you up to be capable to use the full potential of the bike.

 

I think I need to clarify David.

 

What i was trying to put across was that it's difficult to be a bike OPTIMISED for both track use and street use. Yes, I also try almost the same settings for track and street before by trying to reach a compromise. I know it's not encouraged by other trackies but i dun care. Hehe.

 

I firmly agree with the point that it is up to u as an individual to give proper feedback to a good mech so he can set up the bike to your preference. I think we've rehashed this point before. But just to add on, we as riders, also need to study up on the bike and learn how to increase its performance so we can give suggestions to our mechs that they themselves might not have thought of.

[Sub Zero]

If you have same power at 7-10k rpm, why bother rev up to 10-12k? Everyone here so good at keep the bike at high-rev power band or so dare to rev the bike meh? Bigger piston for sure limit the rev cos it's havier, but it can be regain if you can find some light weight piston. And also I doubt with LTA approval pipe can dig out the full potential of polini kit block. Put a small 125cc pipe to a 154cc block for sure it can't breathe nicely and this will affect the power cruve so much.

 

2T pipe/carb maybe the most important thing to do with power, if these two can't match then it will be hard to set a good bike.

 

Hahahaha.. I fully agree with this.. Why the neccessity to rev higher when we can attain that same amount of power or torque at a lower RPM? I'm curious to know.

 

How many riders here(beside lacriomsae) can keep the bike at the so called high revs all the way?? I think i need further clarifications. High revs are from 8000 RPM onwards? so the band from 8000 to 12000RPM riding requires you to shift gears at 12000RPM and mantain riding at that very same RPM? Dear lord, my bike touches 130km/h on 6th gear after valve opens on 17/39 sprocket ration. How to ride at 12000RPM? i'd be breaking the speed limit.

 

Or maybe even in a lower gear, to maintain at 12000RPM? Personally I feel the bike gives minimal or neglible power beyond 11000RPM. And reving your engine to tat 12000RPM mark and mantain it there is just asking for trouble. That sounds and feels harmful to the engine! You dont need to be using a Polini kit to ruin your bike, that kind of riding sounds scary.

 

With that said, I know a rider who used a Polini kit for years before too and it never seized. And he was an extremely aggressive rider, i can vouch for that. I doubt anyone can beat him here. When he upgraded to an rvf, he scrapped his footpegs in a corner with me as pillion! My balls dropped. Hahaha.

 

I think it boils down to rider style and skill. Give an rs125 to a noob, he'd ruin it within weeks with improper riding style. I myself rode chung's bike when it had Polini for atleast 2000Km this year and nothing happened. When it was in premix mode, i even experimented with 2T ratios and metered it down gradually. Still nothing, the bike was strong and fast. The pull next to a stock rs125 is unbelievable then.

[Sub Zero]

im not sure but his wearing a black full face with rossi design at the back of the helmet

 

Rider might be Aslam, he's a police officer, staying in yishun. Rossi design helmet, same as chung's too.

 

Regarding your parts approach xxes123, and get Ah Seng at First Motor to fix it. However, I'd recommend you learn to ride your bike at a stock cc and appreciate before wasting money on a polini. Just look at the debate raging around here.

 

I've heard of the mech you mentioned. From what i know, he's more specialised in big bikes, not the RS125. Sporting is just a branch of Mah at Autobay.

Edited May 17, 2010 by Sub Zero

[Draka]

Rider might be Aslam, he's a police officer, staying in yishun. Rossi design helmet, same as chung's too.

 

ohh ... wanted to wave at him but he ignored my presence beside him at traffic light