sorry but could someone explain what is actually ''lean mixture'' or ''rich mixture''
what are they for, why should one do that, how and why about..
thanks in advance

A carburettor atomises fuel and air. The resultant mixture can be labelled as rich or lean depending on its fuel component. Stoichometrically, a mixture of 1 gm of fuel and 15 gm of air is optimal. This can vary to some extent depending on engine design, ambient temperature, load, etc. You should tune your engine to the ideal ratio... ie. neither rich nor lean.

And ya, breaks every 40 km are perhaps not really called for... at least not in this season. In summers, it might be a different thing. Personally, I have done 40 km non-stop on highway, on my CBZ last year, when it was new (with pillion). Speed was 80 - 100 kmpl. At the end of it, the engine was nowhere close to overheating.... would have happily gone on for many more km...

Thing is, at speeds above 80 km/h or so, wind resistance becomes a major factor, and so fuel efficiency will start dropping significantly.

racoon and ravi thanks for the advice.
so after 75kms is 10min is enough

Many times I rode my bike continuously for 200 km at speeds above 100 kmph.

75-100 km nonstop at 80 kmph is very well within limits of your bike's capability. Go ahead and enjoy.

Dude, its not possible to arrive at an accurate figure like that. As all riding conditions like load, wind speed, ambient temperatures are different.

Keep checking the temp. after every drive. You will eventually be able to tell when the engine is "abnormally" hot...

the other day i ripped the bike to its limit~95-100kmph and used lot of "engine break" after 90km or so i started to feel heat in my feets. the jeans were unable to absorb it totally. i guess engine break too stress the engine

You are right! But, I am quoting the approximate figure. See my above post, I mentioned the conditions too, highway riding at 80 kmph. It will not be that much stressful on the bike.

While climbing Kodachadri, I had to climb in first gear and after 5 km, I had to stop the bike due to burning smell from engine. So, these all are exceptions.

changed the oil(ELF).TOOK my friend on his RTR again for a err..test.
He said "again?? why u even wanna try".I dragged him to the highway somehow and their it happened as usual the rtr vrroomed past me in no time
i twisted the throttle changing the gears as needed he slowed for a truck i overtook him @ this point he started to overtake me on the left i was doing 85km/hr i moved to his lane blocking his progress.He twisted the throttle fully and overtook me easily on the right.and was pulling forward increasing the gap.
I twisted the throttle fully and held it their i saw my cbz reaching 120km/hr for the first time.by this time i was kissing the RTR butt. This time he tried everything to put some gap between him and me.but couldnt shake me off.maybe it was ELF power.i rewarded my bike by giving her a good water wash

@racoon u r correct after i changed the oil i measured the used oil it was only 650ml.
dont know where the remaining 150ml went.maybe it evaporated.

^^^ feed it with some chicken biryani too...

Hmm... thats intresting. Why I asked is that the HH oil and Elf, both are advicing a drain period of 6,000 km with top up every 2,000 km! That means they are assuming you WILL require a top-up every 2,000 km!!

Since HHs are now using the thinnest oil in the Indian market, this is kinda expected. More than evoparation, its more likely that most of that oil got burnt.... as, being thin, it must be getting past the rings...

Good that you measured the old oil. Keep an eye on it.

So you used this oil for like 1,500 km? Btw, if you got 650 ml when you drained it, it means you have lost 250 ml... not 150 ml! Thats assuming you put in 900 ml, which you should have.

I have used HH 10w30 oil for 2000km once. I regularly check the engine oil level and never went down the required level. I was able to drain a liter when I changed.

sarbanoxley, keep an eye on that. 150ml is a good amount consider something is wrong.

@hydbykr mutton biryani would be more appropriate cause she nearly overtook the RTR 2 times.she is a vegetarian BTW
yep i filled the oil after 1600kms.my bike is clean no oil leakage observed .
Its 250ml not 150ml(me and my math).actually i was about to change to fully synty. the local maechanic said the oil bearings or something is weak and should be checked.so dont want to waste those expensive fully synth can.so poured elf to check again.

once a month i spray WD40 over the metal parts liberally.i usually dont wipe the thing off. so dust accumulates everywhere.maybe the mech saw the oil coloured dust(i think its dust) and thought it was oil leakage.

When i apply the front brakes.it no longer bites it feels spongy and my bike doest stop it just drags on.since i changes the oil recently.that wont be the cause could the pads have worn out.my odo reading is 6400kms.

Did you apply WD40 oil even on the disc and calipers?? Hope you have not done that. Thoroughly wash the disc calipers and disc with soap.

250ml less oil is a thing to concern. If you drain less oil at the next oil change too, something is wrong, and you need to take caer of that.

nope i never apply it on the disc , i know what will happen .
washed the disc and the black thing over the disc with high pressured water.
while raccons comment give me a feeling that its OK for 250ml of oil to vanish.while urs scares me.

If i go to service center and say 250ml of oil has vanished.they would say its in the engine somewhere and all oil wont drain. i am sure thats the answer i am gonna get. what to tell them so that they look into the thing seriously.

^^^No dude... nowhere am I saying that the deficit of 250 ml is normal! I was only wondering, because the oil companies and HH are advising top-ups every 2,000 km... question is how come they have assumed that a top-up would be required in the 1st place?!

Problem is I cant check myself because my usage is very low... like barely 1,000 km for 6 months. Since HH advices 6 months max oil life, I have to change the oil before I can test anything. Currently I have done about 1k on the Idemitsu HH oil... and the level is still upto the max mark on the dipstick... so I don't think I have lost any oil (cant say for sure before draining and measuring though).

If other users are not observing appreciable oil loss, then certainly something could be wrong wrong with your bike. First thing you could do is to get your compression tested. It should match what is specified in the workshop manual. Also, it might be a good idea to see if this is happening with other oils also... why not try Gulf Pride or something and check?

How come you were able to drain 1 litre? You arent supposed to fill more than 900 ml... so how can you get more than 900 ml out??

And Sarban, oil cant be "somewhere" in the engine!! If you are putting 900 ml in you gotta get almost 900 ml out... else the oil is being burnt in the engine (and mebbe a v small amount is lost thru evaporation also). Don't accept ridiculous explainations like the oil lurking "somewhere" in the engine and cant be drained out. Actually, its true that some oil cant be drained out... but that is not related to this issue at all!!!

And dude, be careful with that WD40. Avoid letting it come in contact with painted surfaces, rubber parts, bearings, chain, etc (use on chain is a controversial topic and is best avoided).