My twister's engine rattles a lot & noise keeps on increasing with temperature. There's no smoothness in sound. This is how it sounds :-



I've adjusted valve clearances properly but still no difference. Today I took test drive of twister at showroom to compare its sound with my bike. That bike sounded as smooth as butter which is making me even more worried about my bike. So what is the problem?

I listened to the sound...but its hard to tell if there is anything wrong.Engine noise normally slightly increase as temperature rises... please give us some more information regarding your bike.
1) how many km bike has run so far?
2)is there any specific problem ....other then noise and did you met with any accident with bike?
3) when did you last changed oil and which oil are you using now?
4) how many services have you done so far and did you adjusted tappets yourself or through Honda Service center?

There's a good difference between hot & cold noises. Here's the clip of cold engine sound :- http://www.mediafire.com/?7llmc4ca8qwgawu It is beating nicely.
1. 15000kms. But noise existed since d bike was new. Now it has become about 15-20% louder.
2. There was morning starting problem in first two months which was completely fixed after 3rd service. The cylinder head oil leak started 5 months ago but it has been fixed after gasket change.
No accident. Fuel economy is also great.
3. Oil is being changed at 2000-3000km intervals at Honda service center & latest change was 500km before. Oil level is also fine.
4. I've done 7 servicings. Tappets were adjusted once by Honda guys & once by local mechanic which didn't solve the problem. So I've adjusted them myself using 0.1mm feeler guage. When I opened engine I found that there was no valve clearance at all. There was black patch around rocker assembly indicating an exaust leak. I'm posting the pic below. After I adjusted it the exaust note & pickup has improved but not much change in engine noise.
- The noise is very annoying between 15-55kmph. After 60kmph there's NO abnormal noise. It feels as if internal parts are loose or there's no oil. Metallic rattle noises totally overcome the engine's beating sound.

ok will Assume tappets clearance is now set to normal 0.1mm. so you are saying is that when engine is cold the sound is ok and abnormal noise begins once engine heats up after riding some distance right? or is the noise exists even when engine is cold?
If the noise begins only when engine gets hot....then its probably the frictional noise which is due to insufficient lubrication.it could be that oil filter element is partially blocked.....get the centrifugal oil filter and oil strainer screen cleaned from mechanic. also check if idle RPM has been set too high....reducing the RPM will reduce the overall engine noise.(do not set too low that starting problem occurs).also change the Air filter if you have not done so far and check condition of spark plug. one more thing i suspect is what looks like a roller bearing which you can see right side to arrow mark...i wonder if those bearings are making noise.

When engine is cold there's almost no noise when idling but as soon as you start riding, engine is noisy (though less noisy compared to hot & noise increases linearly with temperature).
There is one distinguishable & most annoying noise which resembles a vibrating loose nut on a bolt & it comes from underneath the petrol tank. It totally disappears on idle, low speeds & above 60kmph but it doen't change with temperature. But I didn't find anything loose. Could it be the noise from roller bearing or any other bearing?
Apart from that the genuine engine tone is itself harsh (especially on higher side of midrange rpm but no harsh sound on higher rpm).
Air filter & spark plug were replaced during last service.
I'll get oil filter & roller bearings checked as you suggested. No difference after lowering the idle rpm.
But what I wonder is that this problem existed since I bought the bike (even that noise like vibrating nut, but it has become much louder than before).

You have two options:

1: Take your bike to the ASC and make sure you mention the problem to the
Service guy, take the delivery in day time(like next day morn 11 am) test it
properly (if problem persistent) take it back to them immediately, directly speak to the service
supervisor and blast him properly, keep a record of everythin and also keep all
the documents, i think Rameshap has some nice Honda contacts, use them if u
nothin works out.


2: A good local mech.( I trust my mech more than the asc!)

How about the gear shifts once the engine has warmed up?

try to find exact place from where the noise is coming....by listening to sound in a quite place...ie whether its from engine or outside engine.you can also try by temporary removing engine guard/crash guard/sari guard/tool box as noise could come from loose nuts of these accessories. other possibility is from the gear box as well. i think your mechanic is the best person to find this.

Today I found out that noise is coming from engine.

If you ignore the noise for a moment, you will find that there is very less beating or thumping sound from engine. Could there be a bit of a loss of compression (may be due to carbon deposits on valve seals caused by lack of valve clearance that was there earlier) or timing issue?

wrong valve timing does effect compression...but loss of compression will then result in loss power and fuel efficiency....so if your pick up and mileage is normal then compression is most likely to be normal. chances of carbon seems quite less as bike is only 15k old with normal mileage.in most cases loss of compression is due to leaking piston rings or damaged valve.

petrol prices shot up by 7.5 Rs/liter.....quite a shock !!

But, heard that it would be down by Rs 2/3 per liter, within 2 weeks or so...

Actual cost of petrol is around Rs45/liter only. Central exise duty tax imposed by people sitting in Delhi is 15 Rs/liter while additional tax imposed by state government known as VAT is Rs 12/liter.so Total Tax of Rs 32 Rs is what government earns on Every liter of petrol.....which they are not giving to oil companies thus oil companies are suffering losses....in short we people and oil companies are suffering while government is getting most of the profits. Now due to public anger they may be forced to reduce the tax aby 2-3 Rs.

O I C... Thanks for sharing this info...

No Oil company is ever making losses. I have IOC and BPCL share and get dividends on the same every year. Do you think if IOC and BPCL were making losses they will pay dividenda to thousands of hare holders? Its like this petrol diesel and kerosene are not the only products crude oil. But these are the only products whose price is controlled by goverment. So the other products like engine oils, naptha, and many more are sold by oil companies at a price which cover up the losses of petrol and diesel . But not even one third of public is aware of this. This is a counrty corrupt to core where every goverment fleeces the common man