Google is a great help for all silly and technical questions.

1. Increase of rpm alone is of no consequence until it produces similar or still higher torque over that increase also. So simple generalisation like 'if we increase rpm to .....' does hold nothing.

2. Any lighter cycle part like an aluminium sprocket will have same effect as a lighter crank or piston will have.

3. A higher lift cams means (i) the valve will start from its seat earlier, (ii) it will rush to its peak much faster, (iii) it will reach a higher lift point than a stock. Thus, it will be able to cope up with vacuum much better which is created at/around 70/80 degree ATDC. If the valve size is already good for a given size of an engine (like 149 cc) then the (iii) point above will not hold much good.

Though I do not know the stock R-15 valve size.

www.jdmcars.com/tech/lift_duration.pdf

A very good info. below.

Check this out!


Yamaha India has launched performance parts for the Yamaha R15 and the Ymaha FZ16. However what do the Yamaha racing kits consist of? Re-mapped ECU, High-lift cam-shaft, Full exhaust system, Special alloy sprockets, Adjustable Foot rests, Larger diameter petal disc front brake, Stainless steel brake hose and Race-spec master brake oil cylinder are the parts which can soon be on your Yamaha bike.

The racing parts in detail are : -



Re-mapped ECU
The R15 chassis always felt under-used with that puny 150cc liquid-cooled motor and every time on the track it felt like the bike could do with more horses. Well, that is the focus of the advanced ECU in the performance kit. The rev-limiter has been moved further and instead of 9,800rpm cut-in point of the stock ECU, the race-prepped ECU kicks-in only after the rev-counter needle breezes past the 12,800rpm mark. And that makes a hell of a lot of difference! Yamaha has developed this special ECU which is tuned and mapped to suit the other performance upgrades that come in the package. However, the ECU has been configured with a prefixed map canceling out the great opportunity of allowing the end-user to program it according to his own liking and needs. How we would love to see a programmable ECU on offer! Maybe that’s the next thing in line from Yamaha.



High-lift Camshaft
Yes! You read it right. The package also boasts of a high-lift cam which provides better flow of air-fuel mixture by getting the valve further out of the way than stock. The altered ECU further helps in smoothening out the extra power produced by the engine and care has been taken that the high-lift camshaft does not put strain on the valvetrain.



Full exhaust system
This one will be a big seller. Loud, throaty and adds instant punch to the bike. The full exhaust system is a bolt-on part and immediately improves low-end torque and power delivery. And one thing is for sure, you can’t sneak into your home after a late night ride, ’cause this stainless steel muffler will wake up your entire neighbourhood. It’s short, sweet and smart as a whip. And yes, this is a race track only feature as is the ECU because of both useability in traffic and also the noise level is above the permissible street limit of 80db.



Duralumin Special Alloy Sprockets
The key factor behind R15’s mind-blowing performance and handling has always been its superlight frame. Yamaha has kept this focus on its after-market parts too and the sprockets are no exception to this. As of now, there are two options for the rear sprockets with 40 teeth and 42 teeth, made out of lightweight special alloy called Duralumin. The product line-up hasn’t been confirmed for the sprockets yet, as Yamaha has plans to introduce multiple sprocket options depending upon the demand and need of the users.



Brake upgrades
Braking was phenomenal on the stock bike too, but the bigger 296mm diameter petal disc upfront coupled with a stainless steel braided brake hose, put the R15’s brakes into a different league altogether. The feel has improved significantly and the bike inspires a lot of confidence under hard-braking and mid-corner speed-shedding, dropping braking times and distances by a big margin over the stock bike. The kit also includes a la MotoGP race-bike style master brake oil cylinder. The improved power and braking demands stickier rubber though than the stock tyres can deliver and this is a sore spot worthy of being treated. Exactly a year ago, many were stunned with the performance of the tyres employed on the R15 and were raving mad about them. However, the stock tyres now seem to be struggling to cope with the added horses.



Quick throttle
The package also includes a racing quick throttle that reduces the total travel angle of the throttle from the stock bike’s 90 degrees to 60 degrees. The quick throttle helps in reducing throttle actuation time and provides quicker response from the bike with minimal movement of the wrist. A boon for racers.



Rear set footrests
Apart from the performance boosting bits to the drivetrain, Yamaha have thoughtfully provided one very critical upgrade to the bike which is exquisitely crafted rear set footrests. This positional placement of foot rest with allied linkages perfectly optimized for gear shifter and rear brake pedal is most welcome and highly recommended. It is three-way adjustable depending on rider preference and comfort.
The entire kit works in perfect harmony as the high-lift cam, ECU, the exhaust and the sprockets all have been tuned to work together to give the best possible performance. All of this sincerely satisfies the needs of a serious track-enthusiast or the newbie racer. To match the go, Yamaha is also offering an HID headlight kit for that added bling factor!
Yamaha are yet to determine the exact costs, since the parts will be imported directly from Daytona (the firm) in Japan and thus we have no word on pricing. However we estimate it to be around Rs. 25,000/- Yamaha will start taking orders from July for these parts by email and via their website. The parts will be available by September and trained technicians at Yamaha dealerships will install these parts on the customer bikes.
Source - Zigwheels


Source: Yamaha Performance Parts Review

What a sad sad new it is, it indeed is, TRACK USE only!!! and in addition to that owning a 22.49Bhp R15 with no warranty whatsoever when you know that keeping the rev's close to 12K mark (rather over revving the engine) can blow the whole engine , is really a sad NEWS for ppl like me who have waited so impatiently for this day. Better still we can rejoice the breaded Huge disc's at least But R15 owners should also be offered with the HID similar to the FZ since ppl like me would really appreciate through touring at least.

in the mean time have a look at this
YouTube - Yamaha racing kits: FZ 16 and R15

what abt power increase of fz , iam sure it will have re jet kits & race filters

Thanx for the information above,..but i seriously doubt they can price the whole package at 25 k,..65k makes more sense,..before you pounce and start attacking me,..just have a look at this,..it is an aftermarket exhaust pipe for the YZF-R125 from Leo Vinci performance house, Page Not Responding

Full-Sy-Leovince-GP-Yamaha-YZF-R-125-YZFR125-08_W0QQitemZ200354037833QQcmdZViewItemQQimsxZ20090 619?IMSfp=TL090619177001r902

this itself is in the range of 350-500 Euros,and mind it just for the pipe and header, here for all these offerings 25k would be impossible unless they are planning to mass produce them at saya minimum order qty of 10,000 pcs at least and i do not think that is the strategy they are opting.

1. A higher cut-off ECU is no good on a stock engine, coz of the power heavily saturating beyond peak power. On a Race engine a higher cut-off ignition is mandatory to complement the higher power peak itself.
The Kitted R15s are running a mild performance camshaft which offers slightly higher duration and lift over stock, further supported by a freeflow exhaust will indeed shift the power peak by a bit. So lets say in this case, the power peak is at 9500rpm (stock 8500). The Daytona guys have given a cut-off of 12k odd rpm and once past the power peak, there is heavy power saturation. It only revs but makes no power. It would feel like a stock RTR. It revs till 12k, no doubt but makes no power beyond 10k rpm.
Also a bone stock engine cant be revved too high unless the internals are stronger. valves, springs, piston, conrod etc has to complement the set-up to make it withstand the high rpm abuse. Else its a pack-up for sure
The Kitted R15 is no where close to what a race engine should be.
2. A lighter sproket will add to reducing transmission losses. However I dont understand why so much of hype over a simple sproket, coz the stock sproket itself is quite light and you cant get gains by saving what some 200gms?
3. A performance camshaft in a naturally aspirated engine will generally have higher valve duration and higher lift. Forced induction cams are a different story.
A very aggressive cam profile will indeed punish the valve train to a great extent and that is why a full spec race engine is never opted to be a daily ride. A abuse on the spring, rockers, lobes and valve seat is much higher than a stock.
With higher duration, the valves are open for a longer period thereby allowing more charge to enter the engine for delivering better performance. With higher lift, the valve is open over a larger area again to send more charge for burning. A camshaft with both higher duration and lift is what makes the best sense. However in some engines which have valve lift constraints, only a higher duration camshaft is chosen. Typically, a camshaft with a very radical lift over stock will end-up being peaky but then again it depends on the layout of the ports and valves as well.
Engines which have valve size limitations will benefit a lot the moment you dump a higher lift & duration cam.
A few misconceptions that people have about the R15 are these,
* Stock engine is under-tuned and there is hell a lot of potential
* There is a high performance ECU with Yamaha which can unleash the beast within
* You dont have to fiddle the mechanicals to get power

The fact is this,
* Yamaha has already pushed the R15 engine in stock trim itself. FYI, this engine is a 135/125cc by birth and the valve and head layout has remained unchanged on the 150cc R15 as well. Its just a big-bore of the smaller engine and the internals are pretty much pushed
* The best ECU in the world is not gonna give a stock R15 even 10% gains without touching the internals.
* Even a freeflow exhaust like what Dyatona makes cant give any serious kicks, coz the stock exhaust is already well designed.
* The internals are almost well occupied. you cant stress it further, unless u do something radical inside.

Joel

guys answers to some of your questions...

+ kits are illegal on road

so if yamaha can release this kit, then where the hell is TVS's pro kit????

The petal disc looks EXACTLY like the el cheapo racing boy discs available for mopeds in Singapore. Even the caliper adaptor looks the same. Looks like Yamaha India is going to mint lotsa money with that kit.

I Only need these .... can somebody throw some further light on it ????

fz kit only has free flow exaust & no re jet kits , and they say pwr has increased ,wat the hell ???
low down torque of fz (which is its usp) must have surely come down ;
they will come to know of this once they hit traffic in city

Is the FZ kit street illegal as well. Seems like there not much mods to either the engine or in the sprocketing just a free flow exhaust and the rest is actually increasing safety with a metal brak hose and them petal rotors.

exatly ,there is no new size sprocket ,only a duraluminium crap which reduces weight and is same size 40 tooth ,duhh who is even going to buy this sprocket

these kits are illegal coz they do not meet the city driving norms.
sound, polution etc...

I went to the Yamaha Sales Pune office yesterday for my bike serbicing.I enquired about the performance kits.The Service center guys told that its just the media release that has been done.The kits would reach them by september.

Not all but some parts of the kits would be available for the masses.
I enquired about FZ's kits.... and they said it would cost somwhere around Rs23000 - 25000.More can be expected for R15.He speculated it might go around 30K - 40K.