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**siddharthsure** · 05-30-2014, 01:13 PM

Re: Yamaha YZF-R15 version 2.0

Originally posted by ArnabC View Post

Agreed. No changes. But I guess FI system has been made a bit more refined but no difference in power output.

BTW bro am I wrong to say that O2 sensor is already present in the V2, cause any FI system requires an O2 sensor for calculating the fuel injection rate?

Nope!! V2 does not have an O2 Sensor... And O2 sensor is not needed to calculate Injection Rate. It is used to adjust the AFR by sensing the amount of oxygen in exhaust gas.. During climatic or altitude change, AFR needs change due to change in amount of oxygen in intake air (Eg: oxygen level is less at higher altitudes for the same amount of air intake) This change can be sensed by measuring oxygen in exhaust gas,which O2 sensor does and the ECU does the required changes to adjust the AFR.

R15 Does the above by sensing atmospheric pressure, which is not as accurate as the O2 sensor.. But it does the job during altitude changes

PS: ECU Takes reading from O2 Sensor only during idling or during constant throttle in closed loop FI.... In other conditions,it goes into open loop and uses other sensors for AFR.

**spit_fire** · 05-30-2014, 01:30 PM

Re: Yamaha YZF-R15 version 2.0

Originally posted by stefanm View Post

@spit_fire, My bad not a cable on the rear, you have the piston thing (same on the front) this thing you simply take the rubber boot off and wash it, squirt a dash of oil or dab some grease to the mechanism and put the boot back on. Also while you're at it check the micro switch for the brake light has enough tension and the brake light functions properly, mine had become very loose. Earlier reply corrected.

If your brake's a spongy then you may need to bleed them or check your fluid level.

Cool. Thanks mate, will do. I'd just corrected the tension for brake lights yesterday; mine kept getting stuck and had the brake lights constantly on. A bit of lube there seemed to have done the trick.

**ArnabC** · 05-30-2014, 01:34 PM

Re: Yamaha YZF-R15 version 2.0

Originally posted by siddharthsure View Post

Nope!! V2 does not have an O2 Sensor... And O2 sensor is not needed to calculate Injection Rate. It is used to adjust the AFR by sensing the amount of oxygen in exhaust gas.. During climatic or altitude change, AFR needs change due to change in amount of oxygen in intake air (Eg: oxygen level is less at higher altitudes for the same amount of air intake) This change can be sensed by measuring oxygen in exhaust gas,which O2 sensor does and the ECU does the required changes to adjust the AFR.

R15 Does the above by sensing atmospheric pressure, which is not as accurate as the O2 sensor.. But it does the job during altitude changes

Thanks bro a lot for that detailed info. I wondered how R15 calculates the AFR if it doesn't come with an O2 sensor. Now got it clear in my head.

. So I guess I don't have to worry about the AFR while in Ladakh.

Originally posted by siddharthsure View Post

PS: ECU Takes reading from O2 Sensor only during idling or during constant throttle in closed loop FI.... In other conditions,it goes into open loop and uses other sensors for AFR.

As per this line, you're saying that for touring purpose in hilly areas, where you don't throttle constantly, not having O2 sensor will have zero impact on the AFR. Am I correct to say this?

**Abhishek.Das** · 05-30-2014, 02:08 PM

Re: Yamaha YZF-R15 version 2.0

Originally posted by Yashas Rl View Post

Bro use your knee and backbone for support and don't put the whole weight on your wrists. You'll feel better if you can do this.

Sent from my A210 using Tapatalk

Ya, i been trying to develop the habit of grabbing the tank and keeping my arms loose. But easier said than done. I develop slight pain these days and i really don't enjoy going through traffic, particularly stop-go traffic. The moment you break, your weight gets transferred to your wrist and did i mention the bike doesn't like bad roads.

And bro where you from ? how many years with your baby.

**Akash_Kiran _ Balram** · 05-30-2014, 02:29 PM

Re: Yamaha YZF-R15 version 2.0

Originally posted by Abhishek.Das View Post

Ya, i been trying to develop the habit of grabbing the tank and keeping my arms loose. But easier said than done. I develop slight pain these days and i really don't enjoy going through traffic, particularly stop-go traffic. The moment you break, your weight gets transferred to your wrist and did i mention the bike doesn't like bad roads.

It's usually people who don't keep their back straight while riding that experience stress on their wrists, shoulders and palms, good posture while riding is key to comfortable rides irrespective of the distance being travelled.

Keeping your spine straight, your elbows very slightly bent and your knees locked in (but not squeezing the tank) is the ideal posture as per me.

I ride my R15 everyday to commute around the city and also for weekend rides that vary from 100kms to 500+kms and I've rarely felt uncomfortable.

Hope you get used to the bike soon man.

Ride hard. Ride safe.
Akash.

**kmk0311** · 05-30-2014, 02:31 PM

Re: Yamaha YZF-R15 version 2.0

Originally posted by ArnabC View Post

As per this line, you're saying that for touring purpose in hilly areas, where you don't throttle constantly, not having O2 sensor will have zero impact on the AFR. Am I correct to say this?

As siddharthsure mentioned, bikes with closed loop FI senses the amount of oxygen present in the exhaust gases using a probe which sends a signal to the ecu.. and the ecu adjusts the AFR depending upon the feedback received. This happens only in idling and only upto a certain rpm. ( Mostly upto 30-40% of the max rpm)

In open loop FI the AFR is based upon the current rpm and the throttle position along with air temperature, pressure and engine temperature monitored continuously.. The ecu contains predefined maps and fuelling is done accordingly... AFAIK the problem arises only when we ride carb-ed bikes.. Re-jetting needs to be done to compensate for the lean air and getting a higher afr...

**ArnabC** · 05-30-2014, 04:52 PM

Re: Yamaha YZF-R15 version 2.0

Originally posted by kmk0311 View Post

As siddharthsure mentioned, bikes with closed loop FI senses the amount of oxygen present in the exhaust gases using a probe which sends a signal to the ecu.. and the ecu adjusts the AFR depending upon the feedback received. This happens only in idling and only upto a certain rpm. ( Mostly upto 30-40% of the max rpm)

In open loop FI the AFR is based upon the current rpm and the throttle position along with air temperature, pressure and engine temperature monitored continuously.. The ecu contains predefined maps and fuelling is done accordingly... AFAIK the problem arises only when we ride carb-ed bikes.. Re-jetting needs to be done to compensate for the lean air and getting a higher afr...

Hey thanks to both of you for this knowledge. Now I have a clear idea of an O2 sensor and what it does.

**Abhishek.Das** · 05-30-2014, 05:05 PM

Re: Yamaha YZF-R15 version 2.0

Originally posted by Akash_Kiran _ Balram View Post

It's usually people who don't keep their back straight while riding that experience stress on their wrists, shoulders and palms, good posture while riding is key to comfortable rides irrespective of the distance being travelled.

Keeping your spine straight, your elbows very slightly bent and your knees locked in (but not squeezing the tank) is the ideal posture as per me.

I ride my R15 everyday to commute around the city and also for weekend rides that vary from 100kms to 500+kms and I've rarely felt uncomfortable.

Hope you get used to the bike soon man.

Ride hard. Ride safe.
Akash.

Let's see man, enjoying my ride though. It brings a smile on my face. Who cares about the pain. Bought a pair of ProBiker gloves.
Now waiting for 1st service to feel the full glory of the bike.

I sometime feel little harshness post 5K and engine not that happy revy. Have nothing to compare too as the last bike i rode was 10 years back that too HERO CD DAWN during my college days. Anyone with any insight as to what could be the issue ??

Been driving 4- wheeler since than and my chevy beat petrol seems real smooth. clocked some 22k on it since past 2 years.

But damn, the bike gets to 70KMPH real easy. But why the roughness at higher RPM ?

**Yashas Rl** · 05-30-2014, 05:08 PM

Re: Yamaha YZF-R15 version 2.0

Originally posted by Abhishek.Das View Post

Ya, i been trying to develop the habit of grabbing the tank and keeping my arms loose. But easier said than done. I develop slight pain these days and i really don't enjoy going through traffic, particularly stop-go traffic. The moment you break, your weight gets transferred to your wrist and did i mention the bike doesn't like bad roads.

And bro where you from ? how many years with your baby.

Don't think you mention about it.
Yupp it surely doesn't like bad roads due to the hard shocks!!
I'm from Bangalore and it'll turn 2 on 2nd of June [emoji4] [emoji16]

Sent from my A210 using Tapatalk

**Yashas Rl** · 05-30-2014, 05:14 PM

Re: Yamaha YZF-R15 version 2.0

Originally posted by Abhishek.Das View Post

Let's see man, enjoying my ride though. It brings a smile on my face. Who cares about the pain. Bought a pair of ProBiker gloves.
Now waiting for 1st service to feel the full glory of the bike.

I sometime feel little harshness post 5K and engine not that happy revy. Have nothing to compare too as the last bike i rode was 10 years back that too HERO CD DAWN during my college days. Anyone with any insight as to what could be the issue ??

Been driving 4- wheeler since than and my chevy beat petrol seems real smooth. clocked some 22k on it since past 2 years.

But damn, the bike gets to 70KMPH real easy. But why the roughness at higher RPM ?

You are feeling the harshness mostly because you are using a bike after this long and which is what I feel. Its a engine which revvs smoothly and allows the rider to revv high

I personally feel its smooth after 5k till 8k beyond which there are vibrations (slightly) which I mostly don't care :P
Switching to FS oil after certain period (I switched at 4500kms on ODO) will make the engine even smoother, butter smooth I can say [emoji16]

Sent from my A210 using Tapatalk

**Ron Syl** · 05-30-2014, 05:44 PM

Re: Yamaha YZF-R15 version 2.0

Originally posted by Abhishek.Das View Post

Let's see man, enjoying my ride though. It brings a smile on my face. Who cares about the pain. Bought a pair of ProBiker gloves.
Now waiting for 1st service to feel the full glory of the bike.

I sometime feel little harshness post 5K and engine not that happy revy. Have nothing to compare too as the last bike i rode was 10 years back that too HERO CD DAWN during my college days. Anyone with any insight as to what could be the issue ??

Been driving 4- wheeler since than and my chevy beat petrol seems real smooth. clocked some 22k on it since past 2 years.

But damn, the bike gets to 70KMPH real easy. But why the roughness at higher RPM ?

Warm-up. keep this word in your mind whenever you are starting the engine after 3 hrs of bike being off. a good warm-up will not only give smooth revvs and less vibs but also gives better FE. warm-up in idle for about 40secs atleast and ride sanely for abt 2 to 3 kms. ride like you are in runnin-in mode. see the difference after that. the moment you ripp from the beginning, no matter for how ling you ride the engine wont respond properly.

so warmup the engine next time. and everytime if you are starting it after 3hrs or more. you can even smoothly revv a bit till 4k rpm when warming up.

1st service does not mean you can ripp the bike and 'glory' stuffs. ride sanely till 1k kms, even if you have finished 2 services ( i had done 2 services before i reached 1k kms, but had not ripped). services are just a periodic maintenance things and does not mean the engine is ready to be ridden hard.

You will have pain in wrists and palms in the beginning. no worries on that. neither sit close to tank or too far from tank. keep your hands a little bent, downwards, and also keep your elbows parallel to each other and not to face them outside. so basically if you see yourself from top view, the hands will look straight but from side it ll look little bent. keep your back relaxed, dont make it straight, this will put lot of pressure on your lower back and will prove bad for the lower back later. keep it a little bent forward. lean. ride the bike the way its meant to be ridden, you wont face issues after a while. the bike wont adjust to you, but you will have to get yourself adjusted to the way the bike needs you to.

hope this helps

----consecutive posts auto-merged-----

Originally posted by Yashas Rl View Post

You are feeling the harshness mostly because you are using a bike after this long and which is what I feel. Its a engine which revvs smoothly and allows the rider to revv high

I personally feel its smooth after 5k till 8k beyond which there are vibrations (slightly) which I mostly don't care :P
Switching to FS oil after certain period (I switched at 4500kms on ODO) will make the engine even smoother, butter smooth I can say [emoji16]

Sent from my A210 using Tapatalk

FS does not guarantee a smooth ride if you dont follow certain things. and switching at 4.5k is too early. SS oil is just enough for r15. (also depends what grade you use). if using FS oil get smoothness for bikes then all would have used that.

**ArnabC** · 05-30-2014, 05:47 PM

Re: Yamaha YZF-R15 version 2.0

Originally posted by Yashas Rl View Post

You are feeling the harshness mostly because you are using a bike after this long and which is what I feel. Its a engine which revvs smoothly and allows the rider to revv high

I personally feel its smooth after 5k till 8k beyond which there are vibrations (slightly) which I mostly don't care :P
Switching to FS oil after certain period (I switched at 4500kms on ODO) will make the engine even smoother, butter smooth I can say [emoji16]

Sent from my A210 using Tapatalk

I would like to add more to what Ron said.

In the manual it says that the engine break-in is over after 1K kms. But the fact is it is not the end. Engine break-in continues till 3-4K kms and can even stretch upto 5K kms depending on the ride style and how the service has been done. So till 2nd Service, as per the manual, or till the 3K kms try to ride sanely. Then you can start ripping the bike, but gradually over an ODO reading of another 2K kms, as you want to but please follow the warm-up procedure mentioned by Ron. We all do so, keep the bike on at IDLE RPM, should be between 1.3 to 1.4K RPM, for 40-45 secs when starting the bike after an interval of around 3 hours.

Till 1K kms follow the break in procedure like bible. You can change the oil only at the first 250 kms in ODO. Then normal procedure of oil change during service as mentioned in the manual, only if you're using SS oil, which has a drain interval of 2.5-3K kms. For mineral oil it should be 1.5-1.6K kms of drain interval and for FS oil anywhere between 4.5 - 5.5K kms of drain interval (again depending on your riding style, the figures are for when the bike is not redlined on regular basis and ridden normally with revving till 10K RPM).

Happy riding.

**Akash_Kiran _ Balram** · 05-30-2014, 05:47 PM

Re: Yamaha YZF-R15 version 2.0

Originally posted by Ron Syl View Post

Warm-up. keep this word in your mind whenever you are starting the engine after 3 hrs of bike being off. a good warm-up will not only give smooth revvs and less vibs but also gives better FE. warm-up in idle for about 40secs atleast and ride sanely for abt 2 to 3 kms. ride like you are in runnin-in mode. see the difference after that. the moment you ripp from the beginning, no matter for how ling you ride the engine wont respond properly.

so warmup the engine next time. and everytime if you are starting it after 3hrs or more. you can even smoothly revv a bit till 4k rpm when warming up.

1st service does not mean you can ripp the bike and 'glory' stuffs. ride sanely till 1k kms, even if you have finished 2 services ( i had done 2 services before i reached 1k kms, but had not ripped). services are just a periodic maintenance things and does not mean the engine is ready to be ridden hard.

You will have pain in wrists and palms in the beginning. no worries on that. neither sit close to tank or too far from tank. keep your hands a little bent, downwards, and also keep your elbows parallel to each other and not to face them outside. so basically if you see yourself from top view, the hands will look straight but from side it ll look little bent. keep your back relaxed, dont make it straight, this will put lot of pressure on your lower back and will prove bad for the lower back later. keep it a little bent forward. lean. ride the bike the way its meant to be ridden, you wont face issues after a while. the bike wont adjust to you, but you will have to get yourself adjusted to the way the bike needs you to.

hope this helps

----consecutive posts auto-merged-----

FS does not guarantee a smooth ride if you dont follow certain things. and switching at 4.5k is too early. SS oil is just enough for r15. (also depends what grade you use). if using FS oil get smoothness for bikes then all would have used that.

Exactly... 4.5k kms is too early to switch to FS.
Switching to Motul 7100 20W50 after 10k is the best bet if you're keen to switch to fully-synthetic.

Ride hard. Ride safe.
Akash.

**Yashas Rl** · 05-30-2014, 05:49 PM

Re: Yamaha YZF-R15 version 2.0

----consecutive posts auto-merged-----

FS does not guarantee a smooth ride if you dont follow certain things. and switching at 4.5k is too early. SS oil is just enough for r15. (also depends what grade you use). if using FS oil get smoothness for bikes then all would have used that.[/QUOTE]

I switched on hearing my friend's experience about FS and I did feel better after switching from Yamalube to Motul. Maybe because of the brand if not the type of oil that made me feel so.
Thanks for correcting my assumption!

Sent from my A210 using Tapatalk

**ArnabC** · 05-30-2014, 05:50 PM

Re: Yamaha YZF-R15 version 2.0

Originally posted by Ron Syl View Post

FS does not guarantee a smooth ride if you dont follow certain things. and switching at 4.5k is too early. SS oil is just enough for r15. (also depends what grade you use). if using FS oil get smoothness for bikes then all would have used that.

Completely agree. SS oil is enough for R15. You'll not believe, here at YFS, Pune, they use SS oil for FZ1s, R1s. And SS is what is recommended by Yamaha in India for even their flagship bikes. We just need to keep in mind the grade that is mentioned in the manual.

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Yamaha YZF-R15 version 2.0

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