Re: Yamaha YZF-R15 version 2.0

holy shit, 165-170 kmph ?? :O way too fast for a bike lacking in power apparently..

on the topic of signature, i still havent been able to find out how to place a signature...in the settings section of my profile, or elsewhere, i seem to never be able to not overlook the place where one can write his signature. :P
of course, even if i knew where to set it up, i wouldn't know what to write as my signature lol.

Yamaha YZF R15 Version 2.0 || 15k KMs review || Experience

Well, exhausted all the free services provided by YIM!!! And I am too glad to do so also. My bike clocked 14495 KMs before the last (free) service.
My experience till now:

PROs:



CONs:



Problems faced:



Well this has been my journey till now.

@ The Experts: Could you please provide me an insight about how to solve the problems that I am facing?

Re: Yamaha YZF-R15 version 2.0

There isn't much point in getting HEL for the rear (infact i like my rear brake weak & spongy) but for the front it's worth it. I haven't got it yet but will be getting it soon.
The rubber lines expand more than steel braided ones and also with age and use they tend to get worse. So, with steel braided lines you can brake harder with more consistancy & the brake will be less spongy.

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Those bikes are heavily modded. The engines makes lot more power and the bikes are stripped down & weight a lot less than stock.

Re: Yamaha YZF-R15 version 2.0

yeah i assumed they were fitted with yamaha's official daytona kit.

Re: Yamaha YZF-R15 version 2.0

Not necessarily. While i only have a cursory understanding of the racing scene in India I know their are people like Joel Joseph (he's well known but i am sure there are many others) doing such modifications. And from what i read the Daytona kit isn't at the top of the game.

Re: Yamaha YZF-R15 version 2.0

naive and noobie question probably, but as far trail braking goes, isn't it good to have your front brakes a little spongy for the purpose (assume the rider in question is not a pro but still quite well skilled in trail braking) ? i trail brake very sensitively and i think the sponginess of the brake helps..

unless i am thinking something different by "spongy" brakes than what you guys mean.

i wish to change to steel braided brake lines at some point too, but dont know where i will find a credible mechanic here in this useless city (i can learn the technique but i dont think i'd have the confidence to do a delicate task like that myself on my own precious bike)...anyone ever knew someone from allahabad in this thread, or for that matter, in xbhp ? i have never seen any.

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i thought by group B R15s, abhimanyu meant the yamaha R15 one-make championship, so i was talking about those bikes, which i think are all daytona fitted and probably nothing else from what i have read. so thats why i assumed those 165 kmph bikes were just daytona R15s.

yes i know joel and i think also kaulson racing guys do all kinds of race-focussed mods on R15s and other bikes.

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someone said the HEL brake lines for R15 would cost 7500...this store from mumbai (that i didnt know about until now) says 2600.

Re: Yamaha YZF-R15 version 2.0

Spongy means that the brake pressure isn't increasing in proportion to the amount you are squeezing the lever. Typically the brake pressure increases almost linearly upto a certain point say 60-80% braking, beyond that you can squeeze the lever a lot but the brake pressure doesn't increase by much.

Obviously, you don't want spongy brakes if you are trail braking.
Light trail braking is not difficult (if only because the margin for error is much greater compared to hard trail braking) and most decent riders can manage it even in street riding and its a very useful technique to accurately set corner entry speed.
The key is how you get onto the brakes and more importantly how you let it off. Doing it correctly requires a fairly high level of skill, brake feel and feel for front tire traction.
It should be noted that light trail braking is different from what a MotoGP racer does. They are trailing the brakes all the way to the apex at the limit of traction. That's a whole different level - the margin for error is razor thin.

Also another interesting bit of info: the amount of traction provided by the tires is fixed, whether its from cornering forces or from braking. When trail braking the amount of traction consumed is the vector sum of the longitudinal decelaration (from braking) and the lateral forces from cornering.
The big deal is balancing both of these correctly so as not to exceed the traction limit of the tire.

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Nah that's different, group B is the upto 165cc expert class.

Re: Yamaha YZF-R15 version 2.0

Group 'B' category is virtually an 'open' category for bike modification. It is for 2 wheelers up to 165cc (hence the RTR 160, which owes its legacy to TVS's racing the machine in Group B). Meaning a R15 can be fitted with a over bored cylinder to increase the cubic capacity by 15cc. In addition to the 15cc, you are also allowed to change the following:

1. Gearing ratios (internal & external. Number of gears cannot be changed).
2. Chains.
3. Ignition systems.
4. Valve assembly (sizes, numbers).
5. Crank assembly.
6. Clutch systems.
7. Throttle body.
8. Suspension.
9. Radiator.
10. Brake systems.
11. Wheels.

Many Group B bikes are rumored to make near 30bhp. However, these bikes have very limited 'miles before overhaul' life.


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Re: Yamaha YZF-R15 version 2.0

oh, so this is what people mean by spongy brakes...yes of course in that case the less spongy the better, trail braking or normal braking...yes after a certain amount of pressing the brake lever, there's not a lot of braking force felt by me despite pressing the lever really hard..
sorry i used to think something very different by 'spongy' brakes..

true story...

i'd say getting onto the brakes require more skill and care..i think how one gets off the brakes becomes a delicate matter only when one is at or near the limit of traction, but since most riders hardly get to go near the limit (or at least i havent been able to yet, on account of public roads and me never finding a cornering place empty enough to put all my enthusiasm and mind into it without having to worry about not risking nearby people and objects), letting off the brakes is not so much delicate i suppose for most riding times (i for one have a general tendency to let off the brakes gradually anyway)..but getting the brakes on (whether light trail braking or pretty hard) is i think always a delicate task and always requires a certain amount of skill in "sensing" the brakes and front feedback.



of course mate, of course..thats pro racing at the limit of everything.

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so basically the whole bike can be modified into something else

wow 30bhp R15s...guess those can beat ninja 250Rs even in a drag race despite being 3 bhps lower..

Re: Yamaha YZF-R15 version 2.0

That's often the case: a lot of things that you can get away with when riding at a modest pace simply won't work once the pace gets hotter.
Needs a lot of finesse. It took me ~4 months to get a feel for it. Suffice to say its not gonna come without a lot of practice.

To see an example of hard trail braking check out this video:



Note the trail braking at the corner entry (C1) right after the long straight, in C2, in the entry of the chicanes and in the 2nd last corner.

Re: Yamaha YZF-R15 version 2.0

Agree
but comparing R15 with any other bike here in this thread is certainly an off topic discussion.
Question regarding R15 will be always answered in this thread.

Re: Yamaha YZF-R15 version 2.0

Yup they cost 5.2 for both front and back
As done by Ivin I too changed my brake lines to p220 steel cables for front oneS feels good and saved 1500 bucks
Attaching some pics too


Will get another yammie stablemate for her soon

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Re: Yamaha YZF-R15 version 2.0

yes totally true..hence the need for race tracks every here and there for people like us

nice video btw.

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and what bike will that be ?

Re: Yamaha YZF-R15 version 2.0

Something twice as powerful

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Re: Yamaha YZF-R15 version 2.0

More like getting a grand daddy.

Sent from my GT-I9001 using xBhp Connect mobile app