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**inflammable** · 03-05-2009, 12:29 PM

Originally posted by niranjanvaidya View Post

@praful: scoring or wear on cylinder walls can be caused due to dirt. Dirt acts as a catalyst and can get caught in the piston rings. This caught up dirt grinds away at the metal when the piston moves in its cycle. Scored pistons/rings or cylinder walls allow that small gap to open up and the oil bypasses rings and enters the combustion chamber. That means, scuffing and scoring occurs when oil film ruptures and allows metal to metal contact of the rings on the cylinder walls. Oil contamination, dirt, hot spots in the cylinder and incorrect ignition timing are some of the most frequent contributors to this.

More than fuel, I suspect that the oil/oil strainer/air filter or a freak possibility that some dirt must have escaped into the chamber when the plugs were being cleaned.

Fuel has very little scope in this. Its only when you wash the cylinder with fuel and operate the engine at high rpm without proper lubrication, that, this possibility arises (we know you didnt do that

)

IF the dirt had escaped... then fuel injector getting clogged was the first possibility. Secondly... Always its not because of Dirt.

Unburnt fuel and burning of Engine oil can also cause carbon deposits. Incomplete combustion causes carbon deposits... Rich Mixture can be another reason too...

**pranay** · 03-05-2009, 12:52 PM

Originally posted by inflammable View Post

IF the dirt had escaped... then fuel injector getting clogged was the first possibility. Secondly... Always its not because of Dirt.

Unburnt fuel and burning of Engine oil can also cause carbon deposits. Incomplete combustion causes carbon deposits... Rich Mixture can be another reason too...

This thread is becoming very interesting. Keep it up guys. Great info.

@Praful: Were you running a rich mixture? How much was your CO last time you checked and when?

**Praful** · 03-05-2009, 12:56 PM

CO was set at service in bangalore and then again checked at Chennai for the trackday weekend, the Chennai guys actually set the bike lean cause of faulty calibration of their equipment.

So I got my CO checked and re-set once I returned to bangalore.

So I've actually never been running rich!!!

**niranjanvaidya** · 03-05-2009, 01:47 PM

Originally posted by inflammable View Post

IF the dirt had escaped... then fuel injector getting clogged was the first possibility. Secondly... Always its not because of Dirt.

Dirt escaping into the combustion chamber may not necessarily be via fuel. In that case, even before the injector clogs, the fuel filter will get clogged as also the fuel pump. In any case, the injector will not get clogged due to dirt in combustion chamber as the Fuel Injection is not direct.

I agree to your statement that it is always not because of dirt. There are many other contributors...as I said, Oil/Oil Strainer/Air Filter/Ignition Timing are all probable causes.

Originally posted by inflammable View Post

Unburnt fuel and burning of Engine oil can also cause carbon deposits. Incomplete combustion causes carbon deposits... Rich Mixture can be another reason too...

Engine oil forming carbon deposits is possible when the oil in use is either too worn off and ineffective or when there is a blow by past rings in which the scraper ring is ineffective. This oil burns with fuel and forms deposits on the head, piston crown, valves and gumming on rings(extreme deterioration)

**payeng** · 03-05-2009, 02:41 PM

Originally posted by aditya.sinkar View Post

thanxs payeng....today i gave my bike for servicing again..i hope everything goes right....

i read your Khardung La experience on your website....gr8 , amazing .....i am also planning for biking journey in may ...can you suggest me ne place...i have 8 days off during may...

That "Khardung La" trip mentioned on my blog was done by a few of my friends... not me. Probably next year I should do it too..

**rx100.7050** · 03-06-2009, 11:16 AM

Originally posted by niranjanvaidya View Post

Idle RPM should be at least 1300-1400 RPM. There is another RPM that is set during the CO tuning and that is the anti-stall RPM. If you observe carefully, when you release the clutch when in gear, the rpm automatically rises...this is the anti-stall setting. Ideally PBK sets it to 2000-2100 RPM.
This is the ideal RPM setting.

Though lower idle RPM may not necessarily lead to starting issues, you would face a engine cut frequently since the engine does not idle at a sufficient enough RPM to sustain the next power stroke. In such cases, starting with the throttle slightly open might help.

In any case, visit PBK for correcting the idle and anti-stall setting.

@aditya.sinkar: ask the PBK to confirm whether balancer loading is required for your bike.

NV bhai,
thanks for the info. Went to PBK yesterday, my trusted PBK Okhla. Changed Engine Oil coz I was using NANO all these while

Idling RPM now corrected & Bike is way too cool. No starting issues plus the lack of surge felt when throttle input given, though for few milli seconds, now gone. I am happy

If you guys have noticed that in 1st & even in second gear if you dont provide throttle input bike will still move at a very slow pace. It is good in slow moving traffic where I dont have to press clutch or anything!

**nitrosatya** · 03-06-2009, 11:39 AM

Originally posted by rx100.7050 View Post

If you guys have noticed that in 1st & even in second gear if you dont provide throttle input bike will still move at a very slow pace. It is good in slow moving traffic where I dont have to press clutch or anything!

That is the anti-stall setting. Done during CO setting.

**chilled_fire** · 03-06-2009, 12:04 PM

Am goin to Pune PBK SC tomorrow for 19K serviceing also need the balancer loading to be done, anybody frm Mumbai/Thane/NMumbai wanna join ?
Will be leavin at 6:30 from thane.
Will meet Inder at Chandani chowk and from there FC PBK, will meet Sneh also i guess.
Anybody frm Pune visiting FC PBK 2morrow ? we can meet up.
Also, special thanks to NV and Inder for thier help before hand

**snehmads** · 03-06-2009, 12:46 PM

Chilled: I will be there at Chanadani chowk to see you.

**pranay** · 03-06-2009, 02:38 PM

@ NV, chilled, praful: I hear from other threads that the fairing vibes have more or less reduced in your bikes. How can this be done? I will be visiting Auto Service soon regarding this.

**chilled_fire** · 03-06-2009, 02:41 PM

^^^ well sir , I had a crash and after that they fitted my bike with new fairing along with structure and headlight

**pranay** · 03-06-2009, 02:42 PM

Originally posted by chilled_fire View Post

^^^ well sir , I had a crash and after that they fitted my bike with new fairing along with structure and headlight

Ohhh but the vibes were gone right?

**Praful** · 03-06-2009, 02:44 PM

Originally posted by pranay View Post

Ohhh but the vibes were gone right?

Ok, mine is same old fairing...

and it had no vibes till recently!

**chilled_fire** · 03-06-2009, 02:46 PM

^^^ yup they had even before the crash.
to be specific i had once got the entire fairing opened and refitted,this helped.
Also, do u have the gap between the fairing and the frame packed ? It helps.
Altough my bike doesnot have it .

A simple solution :
if sound{
close ears;
listen music;
}
else {
go to PBK;
cause more issues;
}

**Aryan** · 03-06-2009, 02:49 PM

Originally posted by chilled_fire View Post

A simple solution :
if sound{
close ears;
listen music;
}
else {
go to PBK;
cause more issues;
}

If problem not solved
{
loop;
}

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