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Old 9th May 2010, 20:46   #1
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Default 6000Rpm issues on my Pulsar 150

Hello,

I have this observation on my Pulsar 150 ES.
I find this disturbing sound at 6000~Red line rpms. (I have found its coming from the engine area)
sound is like wooden-hammer-striking-metal kind of sound
like try pronouncing~ rthuck.
Now, I Do know, that the bike will have good amount of vibration, but, I have done 6000Rpms on other Pulsars here to compare, and I do find, that others are nicely sounding "grunters" while my Pulsar's sound is less of a grunt and more of a scream!
The Bike is stock, (only Gabriels have replaced the standard grabs).
It has run around 7K, and used by my bro. for daily commute of 10~15Km, barely crossing 4000rpm (or thats what I think! )

Bro tells me, a local mechanic told him, that its sound of "idler gear".

Anyone has similar observation?
Any solution/explanation to this?

Care,

Ace.
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Old 11th May 2010, 01:57   #2
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Can you be more elaborate:
1. Does this happen when the engine is cold or hot?
2. Do you find the noise if you shift down to neutral and rev up?
3. Noise audible from the engine or exhaust?
4. Does it seem load sensitive, that is do you only hear it uphill and accelerating or is it there cruising at a steady high rpm on straight roads?

Possible Solutions:
1, Check drive chain for tension and adjust if necessary.
2. Check the petrol quality, if possible, clean the tank and fill it at least to the half with clean petrol and check
3. Check engine oil and replace/top up if needed.
4. Check and clean/replace the spark plug.
5. Adjust/clean the Carburettor jets for a richer mixture.

These are the basic steps that can be done if you are willing to get your hands dirty and are familiar with the parts.

Hopefully, the problem should be rectified.

If not, the problem may be with the Cam chain or Tappet adjustment, which might involve opening the crank case. Better leave it to a qualified mechanic/ASC.
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Old 14th May 2010, 00:45   #3
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I'm sorry for the delay,
but, here are the conditions:
Quote:
Originally Posted by KA18 View Post
Can you be more elaborate:
1. Does this happen when the engine is cold or hot?

In Both the conditions, although, I do not rev above 3000 when cold~warm..
2. Do you find the noise if you shift down to neutral and rev up?
Yes,.. but will check again.
3. Noise audible from the engine or exhaust?
Engine area, sure..
4. Does it seem load sensitive, that is do you only hear it uphill and accelerating or is it there cruising at a steady high rpm on straight roads?
Irrespective of loads applied.

Possible Solutions:
1, Check drive chain for tension and adjust if necessary.
Just finished a servicing, so, assuming for time being, that it is taken care of.
2. Check the petrol quality, if possible, clean the tank and fill it at least to the half with clean petrol and check
Done 3/4th tank, (twice!) last time, and previous to that time.
3. Check engine oil and replace/top up if needed.
Will check, but again assuming, thats taken care of in the service.
4. Check and clean/replace the spark plug.
Will do that tomorrow.
5. Adjust/clean the Carburettor jets for a richer mixture.
hmmm..

These are the basic steps that can be done if you are willing to get your hands dirty and are familiar with the parts.

Hopefully, the problem should be rectified.

If not, the problem may be with the Cam chain or Tappet adjustment, which might involve opening the crank case. Better leave it to a qualified mechanic/ASC.
Let me also share this.
I had started noticing, lately, (like last 100km~200km), that the revving is really not so smooth, but is fairly coarse (even more when the engine is warmer). comparitively better when the engine is cold!!
I mentioned that at the service (2nd May 2010), and the firing was returned ok-ok. atleast better than before.

I am really uneasy with the same!

Will try to check the mentioned things again.
Till then, more views, experiences welcome!

Care.

Ace.

Last edited by driverace : 14th May 2010 at 00:47.
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Old 2nd June 2010, 23:29   #4
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Default rpm issue still floats

Dear All!

The rpm issue persists!
Any feed available on the same?

(Spark Plug and Engine oil can be ruled out as suspects!)

Ace.
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Old 3rd June 2010, 00:21   #5
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Have you checked the engine mounts?
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Old 14th June 2010, 16:11   #6
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Quote:
Originally Posted by driverace View Post
Hello,

I have this observation on my Pulsar 150 ES.
I find this disturbing sound at 6000~Red line rpms. (I have found its coming from the engine area)
sound is like wooden-hammer-striking-metal kind of sound
like try pronouncing~ rthuck.
Now, I Do know, that the bike will have good amount of vibration, but, I have done 6000Rpms on other Pulsars here to compare, and I do find, that others are nicely sounding "grunters" while my Pulsar's sound is less of a grunt and more of a scream!
The Bike is stock, (only Gabriels have replaced the standard grabs).
It has run around 7K, and used by my bro. for daily commute of 10~15Km, barely crossing 4000rpm (or thats what I think! )

Bro tells me, a local mechanic told him, that its sound of "idler gear".

Anyone has similar observation?
Any solution/explanation to this?

Care,

Ace.
1. the idler gear might be out of tension. It produces more of a chik chik chik chik sound at idle, especially when engine is warm and tends to scream at higher rpms.

2. The timing chain tensioner/ tensioner assembly might be out for a toss causing the chain to slap the tensioner, which would further slap its surroundings, resulting in that sound. To check the same remove the bolt on the tensioner assembly. It is protrusion coming out of the cylinder bore and is located on the right side, just behind the clutch rod assy. on the gear box.

Now start the engine.

Once the bolt is off, insert a screw driver or any pointed object till you feel a dead end. - in the hole thats exposed. hold it there. Now, with the engine running, you should NOT feel any jerks or kick back. If you do then the timing chain & assembly are the culprit.

Try this much and let me know what the results are.
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