I am riding my GS for past 1 week and completed 350 kms, and observed this kachak kachak type noise very briefly for some short distance but I was not sure that it was coming from my bike. When i heard it twice then I realized it was indeed from my bike. But this noise remains for very short duration in my 30 kms ride one way, everyday. Will get it done corrected in my first servicing

Ignore it, if you ask the SVC guys to correct it they might mess it up.
Its nice to have abit of tappet noise, and the bike also performs a weeny bit more in the top end if the tappets are slightly loose.

The point of adjustment comes when you'll start hearing the kachak noise as soon as you start you'r bike. Till then its ok, though it wouldnt hurt to keep a personal check on the clearance once in a while.

Yeah, I have two more weeks to go before servicing, if I am not bothered by that noise I will surely not disclose to service centre guys

@all above ::
Don't come to conclusion or illusion about the noise from the engine is only TAPPET..
Check it thoroughly from the SVC (one or more SVC will be good)..
TALK TO THE MANAGER OF THE SVC AND GET HIS GUIDANCE .

In mine the noise only comes when hot and no unnecessary noise when cold. So i guess it must be faulty Cam chain.

I have tried many local mechanics, even new unknown ones none of them are aware of the Gs engine. Then enjoy the ride and their reply would beThere is some noise which would require the engine to be opened, since the bike is new take it to SVC.

i like the fact that at least they r frank indirectly

Ok,then better visit the svc.also if possible,stay with the bike,so that you can see if they will adjust it or not.

Earlier you were sure that that sound is from tappet. Someone pointed out that it is from the cam chain. Then you are ready to agree that it is from cam chain.
Ask the mechanic in the SC to ride the bike and if there is tappet noise, keep the bike overnight there and get the clearance corrected next day, on cold engine.
The valve clearance must be zero or nearly zero when the operating temperature of the engine reaches its maximum.

This member sounds like our new Member Vishnukmd.


Who said its impossible to eliminate tappet sound? Have you tried setting tappets yourself? I had adjusted tappets in a bike and the result was 100% successful.No more tappet noise till now after adjusting.

Any scope if I post a copy of my horoscope?

Me.

No. My bike is not a gift from anyone to experiment with. I bought it by giving my own hard earned money.

Great. The experiment is not on your own bike.

Is that bike insured against fire?

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Aswin,
Why are you dragging another person – even though he is an expert or the only expert among us – to this discussion instead of trying to learn what he taught? It is evident that you are not a good student who can recollect what he has learned.
One more doubt. Have you ever seen any biker other than you - even a mechanic - adjusting the valve clearance or tuning the carburetor, parking the bike on the road side?
Doing the essential repairing oneself and being obsessive is totally different. That is what I have pointed out or tried to point out and is because I am totally against unnecessary maintenance woks, modifications and tunings.
Let us leave it now.

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The situations – adjusting the valve clearance or retuning the carburetor at roadside and handling a flat tire - are totally different.

Tappet noise may slightly differ for different different engines,for e.g.the valve train noise in RTR engine is not the same as its in your ZMA!If there is 'more than required' clearance between the valve head and the tappet,some engines produce 'tik-tik' sound even when at cold conditions.The kachak kachak noise you had mentioned comes most probably when the engine is hot.

The tappets making noise after riding the bike for some kms is quite normal provided they are adjusted to the co.specs.For GS150R its 0.05mm(intake) and 0.08mm(exhaust) I guess,not sure though.

There should be some clearance between the valve head and the adjustment bolt,i.e.the tappet.But dont try to keep less gap and completely eliminate the noise,that will damage the engine in long run for sure.Insufficient clearance results in decreased power,drop of top end performance and overheating,valve overheating or burning.Exhaust valve wear is typically faster as they are subjected to more heat than the intake valves.
The first sign of too tight clearances is a reduction in performance as the engine warms up.The clearance is necessary because the valves get a little longer as they heat up. They'll seat when cold but leak when hot if the clearance is a little tight.If they leak when cold, they are way out of spec.When they don't seat,the valve bodies overheat because they are in the flow of combustion gasses and never get to give up heat by contacting the head. This can result to burnt valves.
Also,a 'little' more gap than required will give you better redlining abilities at the cost of tappet noise!
Following things should be kept in mind-The engine must be bone cold before adjusting tappets.They should be adjusted to co.specs given in the user manual.
The valve clearance should always be set when the piston is at TDC(Top dead centre) of compression stroke(both the valves are closed at this point) i.e. just after the intake valve closes.The SVC guys most of the time ignore this and the above thing happens.

Whats your odo reading?If there is no noise when the engine is cold then you dont have to worry about it,tappets generally tends to produce noise when they get hot but there is nothing wrong in getting them checked for proper clearance.