224 replies to this topic

[Ricci]

@Nikhil : the true exhaust pipe would be inside it, this is the outer pipe and usually is stainless steel as you mentioned, so it won't rust easily. The discoloratio will be there and probably get worse. As long as it doesn't take on a blue-purple hue , it's fine

[L.P.]

rahul_rn, on 25 April 2012 - 09:52 PM, said:

Don't know about the problem, but i am getting a funny feeling you look like this..
536321_344262085633486_251047451621617_912416_1684409388_n.jpg
I am sure many might agree..

This is called the BITCH Please Attitude Troll :-P

Precisely I agree to you too

[samschenker]

Ricci, on 25 April 2012 - 10:35 PM, said:

@Nikhil : the true exhaust pipe would be inside it, this is the outer pipe and usually is stainless steel as you mentioned, so it won't rust easily. The discoloratio will be there and probably get worse. As long as it doesn't take on a blue-purple hue , it's fine

Pardon my ignorance, what if the de-coloration is purpulish, is that something to worry about?

[arn]

No.

It's simply the exhaust material getting  "heat treated" and thereby changing colour.

[NikhilB]

^^

Arn is right.

Have felt the surface of the exhaust header (when cold) and there are no imperfections, even on the discoloured portions. The pipe is still smooth.
In my mind, rules out peeling.

[samschenker]

arn, on 09 May 2012 - 12:53 PM, said:

No.

It's simply the exhaust material getting  "heat treated" and thereby changing colour.

NikhilB, on 09 May 2012 - 01:24 PM, said:

^^

Arn is right.

Have felt the surface of the exhaust header (when cold) and there are no imperfections, even on the discoloured portions. The pipe is still smooth.
In my mind, rules out peeling.

Thanks guys, the part of the exhaust pipe(before the O2 sensor) has just started to decolor.

@Nikhil - Even I have the similar decoloration at the same place like yours but they are just few dots here & there and yes they dont feel rough, the pipe still feels smooth.

[pulsurge]

I think there's nothing much to worry about....the ZMA was the worst in this. But then it never hampered the working.

[satyenpoojary]

Two interesting points
1. Bike heating up
2. The discolouration

In theory this is an indication that the bike is being made to run rich.... Why would anyone do that?

[NikhilB]

^^

Do you think it is heating up more than any other liquid-cooled naked? (Haven't ridden any other, so I wouldn't know). Also, popular opinion is comparing the engine heat with that of an air-cooled bike which doesn't seem fair to me.

Discolouration and rich tuning? My GK starved mind would appreciate an explanation for the connection between the two.

[satyenpoojary]

NikhilB, on 10 May 2012 - 01:34 PM, said:

^^

Do you think it is heating up more than any other liquid-cooled naked? (Haven't ridden any other, so I wouldn't know). Also, popular opinion is comparing the engine heat with that of an air-cooled bike which doesn't seem fair to me.

Discolouration and rich tuning? My GK starved mind would appreciate an explanation for the connection between the two.

I havent ridden the Duke much to be fair, so cant comment if its more or not! But a faired liquid cooled bike channelizes the heat better (away from the rider), whereas a naked just let the wind take care of the heat over and above the liquid cooling.. thereby blowing it to the riders leg!

The block is designed to take X rate of charge (Fuel+air)
If its tuned rich, it will take X+Y charge.. (however miniscule the Y be)

This not to optimally burnt fuel will escape in the exhaust stroke and heat the exhaust pipe! Very common in drag machines with utlra thin steel pipes!

[NikhilB]

^^

Aha. Got the connection.  
Doesn't unburnt fuel igniting in the exhaust header produce a popping sound? Nothing of that sort on the Duke.

Also, regarding the heat. It is very noticeable on traffic signals. But that's mostly because the radiator fans are chanelling the heat to your legs, quite unlike a faired bike.

I guess an inspection of the spark plugs could validate the "rich tuning" theory...

[spinz]

Strangely I'm feeling the bike to have lost its pickup after the 1st service, So i changed the oil to Motul 300v. The bike got smoother but still feeling like its not as quick as I test rode the test mule. Sadly no other bikes in my area so as to take a back to back test ride. I think I'll visit the ASC which is about 150kms away and get it checked

U guys can come up with any valid reason for this. The bike touched 137kmph though a couple of days back

[L.P.]

spinz, on 10 May 2012 - 06:17 PM, said:

Strangely I'm feeling the bike to have lost its pickup after the 1st service, So i changed the oil to Motul 300v. The bike got smoother but still feeling like its not as quick as I test rode the test mule. Sadly no other bikes in my area so as to take a back to back test ride. I think I'll visit the ASC which is about 150kms away and get it checked

U guys can come up with any valid reason for this. The bike touched 137kmph though a couple of days back

The ECU takes the feedback from the Meter Console, and now that the Power band has been elongated, it wont feel that quick, but it is, just that the power band is not abrupt now.

this is quite common, still you are faster than anyone on road

[spinz]

L.P., on 11 May 2012 - 10:46 AM, said:

The ECU takes the feedback from the Meter Console, and now that the Power band has been elongated, it wont feel that quick, but it is, just that the power band is not abrupt now.

this is quite common, still you are faster than anyone on road

Hmmmm bout the meter console thing...well I took ur advice a couple of pages back and set the Rpm1 and Rpm2 between 5k to 8k about a week ago. Riding on the same limit...No difference felt

[L.P.]

spinz, on 11 May 2012 - 09:42 PM, said:

Hmmmm bout the meter console thing...well I took ur advice a couple of pages back and set the Rpm1 and Rpm2 between 5k to 8k about a week ago. Riding on the same limit...No difference felt

Ohkay Not really sure, how you fiddle with it, but initially when they changed it, I felt the power band to go a little linear that the abrupt way it was earlier.

Ohkay My Main motive to post here is-

Anyone facing issues with the COLD Start, overnight Halt and then Early Morning Start Issues???
Mine takes like a 5-7 Cranks to get up.

Will try to get the Crank roll over sensor and Lambda Sensor checked once.