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**vkavadia** · 06-27-2011, 07:06 PM

Originally posted by psr View Post

The CBR 250 has a closed loop system for sensing the Oxygen level in exhaust,through a Lambda(Oxygen) sensor. The oxygen sensor needs to be hot to sense ,and so is positioned close to the exhaust port..This heats up the sensor in about a minute or two depending on the ambient temperature.So the engine is kept at a higher RPM by ECU in open loop mode, and once the sensor heats up and starts sending the voltage, the ECU changes from open to closed loop and uses the sensor out put..this is when the engine comes down in RPM..
It is normal ....

So is it alright to start riding while the sensor is still heating up?

**aargee** · 06-27-2011, 07:14 PM

You can't do a seizure when the sensor is heating up. But ideally, just warm up until the RPM level falls to 1500 +/- 1000 RPM & then start riding. Its a good practice.

**thefastestindian** · 06-27-2011, 07:41 PM

Originally posted by vkavadia View Post

So is it alright to start riding while the sensor is still heating up?

You are good to go after the first engine temp bar appears. You need not wait for all the 3 bars to show up. Don't ride in high RPMs before all 3 bars appear.

**psr** · 06-27-2011, 07:53 PM

Originally posted by vkavadia View Post

So is it alright to start riding while the sensor is still heating up?

The most important thing for any engine on start up is to have it's internals lubricated well with engine oil...It takes approximately 30 seconds for a engine to develop enough pressure through it's oil pump, and send oil into all essential areas.This is the critical period when engine should not be increased in RPM or subjected to load by engaging gear and driving...So after starting let the engine idle for a minimum period of 30 seconds before driving...waiting upto one minute will be better.

**vkavadia** · 06-27-2011, 08:09 PM

Originally posted by psr View Post

The most important thing for any engine on start up is to have it's internals lubricated well with engine oil...It takes approximately 30 seconds for a engine to develop enough pressure through it's oil pump, and send oil into all essential areas.This is the critical period when engine should not be increased in RPM or subjected to load by engaging gear and driving...So after starting let the engine idle for a minimum period of 30 seconds before driving...waiting upto one minute will be better.

Yep.. I've heard about that and follow it on my bike too.. Helps in the long run..

**psr** · 06-27-2011, 08:25 PM

I have a totally OT but relevant link I request members to see:
What Teflon Is And Why You Should Avoid It. | The Good Human

**vkavadia** · 06-27-2011, 08:31 PM

Originally posted by psr View Post

I have a totally OT but relevant link I request members to see:
What Teflon Is And Why You Should Avoid It. | The Good Human

Useful but only in the kitchen as the comments suggest.

Teflon doesn't break down at normal day to day temperatures is what I figure from the article.

But all the same, the very bike you ride emits carcinogens man! No offence; I'm just saying that there are toxic substances all around us, part of daily life and if everything is in normal ratios you'll live happily till 80 or 90 or maybe even 100!

**darkknight** · 06-27-2011, 09:08 PM

touched 151 easily on a 6-7 km flat stretch -- guess it could have gone more-- was not red lining --

am a it more happy man now

**aargee** · 06-27-2011, 09:12 PM

^^^ Damn it!!! I should've ideally been in a position to do such experiments & posting such top speeds!!! Anyway good to hear. What was the RPM DK at 150 Kmph?

**darkknight** · 06-27-2011, 09:14 PM

Originally posted by aargee View Post

^^^ Damn it!!! I should've ideally been in a position to do such experiments & posting such top speeds!!! Anyway good to hear. What was the RPM DK at 150 Kmph?

That's the sad part -- i was tucking in & doing too much given the traffic conditions ---also enjoying

to notice

--

will do it tomorrow morning again when traffic will be little less & post here

**POS** · 06-27-2011, 09:35 PM

Originally posted by darkknight View Post

touched 151 easily on a 6-7 km flat stretch -- guess it could have gone more-- was not red lining --

am a it more happy man now

that's kool yaar... so how u feel after touching the landmark of 151...

**aargee** · 06-27-2011, 09:49 PM

Originally posted by darkknight View Post

will do it tomorrow morning again when traffic will be little less & post here

Tks DK & pls do not forget to notice the mirror, footpeg, handle bar vibes in the lower speeds after you've clocked the top speed in addition to noticing the RPM limit.

**Youngking** · 06-27-2011, 09:50 PM

Originally posted by darkknight View Post

touched 151 easily on a 6-7 km flat stretch -- guess it could have gone more-- was not red lining --

am a it more happy man now

I could understand how happy you are

. I managed to touch 150Kmph. You overtook me by 1kmph

. I pulled 150 mark twice, one at night and other on a day. At night it is easier to do than in a day. I started working out so soon i'll be lighter to surpass you

.

**darkknight** · 06-27-2011, 09:59 PM

Originally posted by POS View Post

that's kool yaar... so how u feel after touching the landmark of 151...

Originally posted by Youngking View Post

I could understand how happy you are

. I managed to touch 150Kmph. You overtook me by 1kmph

. I pulled 150 mark twice, one at night and other on a day. At night it is easier to do than in a day. I started working out so soon i'll be lighter to surpass you

.

I was happy that MY bike did it given the fears that I had --nothing else

Aargee :I do have that lower rpm chacteristic still playing below 3k rpm so surely will notice it & let you know

**aargee** · 06-27-2011, 10:01 PM

Araey DK, not that point.
Just wanted to check if the vibes are increasing with everytime you hit the top speed that's all. Because mine did. After 150 Kms (not kmph), the mirrors had vibes. Once I touched 123 Kmph, the foot pegs had vibes after 110 Kmph. This is what I wanted to verify. This is a characteristic with most commuter segments.

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