i suggest u pm mg biker.He is the 220 guru

this has beacome apart of our lives i guess to spend alteast 2-3 weekends of a month in SC .... hahahahahahahaha ...

On a serious note
@beastrider: ur CO is surely low , but it wont cause issues which u mentioned specifically stange noises on high RPM (could u plz explain this ? is it like knocking ?)

also, do u stick to one petrol pump ?

Your CO seems pretty low. Is the mixture running too lean?? Praful Sir, Am I right in guessing?

1.4 CO level..?? isn't that a bit low..??

During the last service, the CO level of my bike was set at "3" as pointed out by MG once.. after that the initial and mid range pick up of the bike has improved tremendously on my bike

Payeng Sahab also agrees to it.

Payeng,
Doesn't it mean Fuel - Air mixture is lean? I think so & that's the reason drop in performance

Yup. I think the CO is too low. BeastRider, you should get it checked. and set it to 3 as advised. Mine is at 2.5.

Don't known the exact funda behind the CO level.. logically it does seem that lower the number might mean a Lean Air-Fuel Mixture.

Right anyone?

^^ yes , i believe, will check my mails and get back

these days my bike behaves a bit strange, after about 15-20kms of riding it becomes very harsh, also this weekend when i went for 100kms ride the bike was really harsh after initial few kms.
even in my daily commute, it runs the best in mrng but while coming its very harsh at all RPM range....
any gyan anyone ?

Buddy it's quite difficult for me to explain about the sound....
The bike goes upto certain RPM easily...then sudden drop in acceleration....

Will go this weekend to set it to 3..

Let's hope the bike performs well after the CO setting.

the pic u asked for is below. sorry for that ID. u can use short forms like"burn" or "soul" but pls dnt use "rubber"

i got the rear wheel aligned and now its showing 82@ 6k. which i believe would amount for a max loss of 5kmph at best at the top(that's my guess ,i may be wrong).i never take my bike to more than 120 kmph coz of safety reasons and my bike still does that with the tyre change. iam not concerned with the top speed and never checked it so its not wise for me to comment on that . logically the top speed should come down.

i never look at the speedo when iam riding so its not a bother for me. why i want to change it to R15 is because the stance of the bike has changed. to restore that stance i need a drop in height of about 6-7mm at the front. so i have 2 options , either go for the FZ front tyres which offers a drop of 1mm over the stock ones along with a medium setting for the rear shockers which will add a few mm of height to the rear or go for the R15 front tyre which allows a drop of 9mm at the front.
i being on the shorter side would prefer the 2nd option and not to speak of the tremendous grip and flickability that the R15 tyre offers.

yeah the speedo will show less speed but what it was showing was huge so when i checked, the wheel was not rotating freely. moreover i had difficulty in pushing the bike that's when i sensed that something is wrong with the rear tyre.

now there is a definite drop in the speed/rpm but its very small and if u are not looking at the speedo u may very likely miss it altogether.

One thing I want to say... The rear tyre has been changed... Not the front one... And sensor wire is connected to front axle..

Its strange that howcome the speed indication has changed at 6000rpm..

Have you taken into consideration the road... the tarmac... opposing winds.... There can be other factors to the change in speed...

Second... Its a digital meter and ther's a magnet position sensor... And its not the Worm gear type arrangement used in Mechanical Meters... SO possibility of error from meter is ruled out... Since its dependent on how fast the magnet passes the sensor... correspondingly the pulses are genrated... which are converted into readings which everyone can understand...

Let me try to explain that :

1) Speed is indicated by the front axle arrangement.
2) RPM is indicated by the rear axle arrangement(assuming sprocket is unchanged).

Stock Assumptions :
at 6 K RPM (~rear axle rotation), speed is 83 KMPH (~front axle rotation) in 5 th gear.

Case 1 : Change rear tyre to less profile.
To maintain the speed of 83 KMPH, the bike has to rotate more because of the decrease in the circumference of the rear tyre. Say engine has to rotate at 8.5 K RPM to achieve 83 KMPH at 5th gear. So to maintain same speed, the RPM is higher. Approx : at 6 k RPM , speed might be ~80 KMPH.
Note : Accuracy of Speed shown in this case is same as stock setup.

Case 2: Change front tyre to a lesser profile.
It is possible that speed indicated might be around 83 KMPH at 6 K RPM in 5th gear. But the indicated speed is not accurate. With a lesser profile tyre, the tyre circumference is reduced, so for the same number of front axle rotation, the distance covered by the tyre is less.

Summary :
Increase Profile at rear = More speeds at same RPM compared to stock(Speedo Reading Accuracy unchanged)
Decrease Profile at rear = Less speeds at same RPM compared to stock(Speedo Reading Accuracy unchanged)
Increase Profile at Front = Will Indicate Speeds less than actual Speed.
Decrease Profile at Front = Will Indicate Speeds more than actual Speed.

Hope my attempt to explain worked out.

have one query guys. I am 80 kgs. I usually carry a backpack which is 3-5 kgs. If i totally crouch behind the windscreen then I am able to touch 120-26 kph. Stretch I tried was on DND expressway which is I think 3 kms long. Why I am not able to touch more, any idea??? Because of my weight?

Perhaps, the tyre discussions should be taken to the proper thread! Many guys have been here long enough to understand this simple fact that there are dedicated threads made available for a particular topic of discussion.

Inspite of moving the relevant posts from this thread to the 'Tyres' thread, still I see quite a number of posts of tyres (in detail) being again discussed here. A little discussion is obviously unavoidable, but literally 'hijacking' a thread is simply unacceptable, in my opinion.

Please guys, take the tyre discussion to the relevant thread. I am moving the post(s) pertaining to the tyres to the correct thread this time (AGAIN!)...

@Aryan,


I think its OK to let the Tyre Discussion remain in the P220 ownership thread.. after all its the Discussion of how Tyre Swaps have resulted in the change in performance and dynamics and the "Ownership Experience of the P220"..

So I think such discussions are totally relevant here.