Pinaki ji
My ASC mechanic told me that the HH bikes before 2005 have thicker oil pump, so at that time the company was providing 20w40 oil in ASC. But on & after 2005 the company made a change in oil pump, now its tinner than before so the ASC started proving 20w30 oil onwards. If u use 20w40 oil on recent bike the oil will not regulate he said.
so please make it confirm about this.

So all this problem happened after your oil change? or remember any similar troubles while returning from the SVC?
Check the clutch play and cable condition. Faulty clutch cable might have been preventing complete engagement or disengagement of the clutch.

But Ashwin, that's what Srijit said is happening in his bike , see ..

After having argued this to the bones in the engine oils thread , I (as well as many others) have investigated this as well as we could too . Fact is , there has been NO change in engine design or manufacturing process . As soon as they started marketing their own oil they simply started printing "HeroHonda Premium 4T plus 10w30" instead of "Servo mutigrade 4t 20w40" in their owner's manuals . Surprising , isn't it ?

He might have able to do that accidently or once without any slipping.
And the "thud" sound is the same what we hear while shifting gears, say from 6th to 1st while bike on stand still and engine running.
Everything is same even if you use 20w40 or 10w30 is't it?

Why company provide 10w30 oil? we follow everything from manual, but not the engine oil they recommend. I too feel 20w40 is better.
Anyway u know better than me

are u sure its 10w30, i thought its 20w30.....i dont know, whatever it is. I haven't buy oil from ASC ever!

You might start the engine at -20 degree celsius but a 20w40 oil is designed to operate at even lower than these temperatures. That is how everything is designed.So oil will stay as oil even ambient temperature drops below 10 or 20 degrees.

It all matter untill normal operating temperature of the engine is reached.

true it happened on my gs and splendor as well
but on both bikes it happened after service and while engine off and i just moved and stopped the bike for few inches and able to shift from a to z all gears, maybe some super sweet spot in gear box and clutch due to excess greaseing during service.

In 20W-40, 40 shows the weight of the oil at 100 oC not at 40.

And I still cannot understand the relevance of 30 or 40 oC here.

A slight movement of the bike is enough to shift the gear while the engine is off. And without this movement, as Ashwin said, shifting in that position is impossible even if the clutch is disengaged. I think Srijit has moved his bike slightly forward while shifting gear and if so, it is normal.

thanks ashwin, that's what i though. i was doing that without starting the bike rested in middle stand.

You might be referring to this



You ended up in the wrong shampoo after all your research pinaki!. May be a friend of yours might have recommended it for you. If you are finding that much grit and grime on the underside, hand over it to the professionals and they will remove it with their more concentrated shampoo or teepol or whatever you name it solutions. It will be difficult for you low concentrate tide and a toothbrush to reach everywhere. If there is a lot of tarring going on your home town very often, buy some teepol from the service station or you will find difficult and time consuming in rubbing on the wheels whole day with the tooth brush. As you said, service station people are using Diesel or kerosene prior to it but they are also washing it away properly.

Dear All,
I would like to add some information regarding the engine oil grades

Firstly, the engine oils when they mean SAE 20W40 the numbers 20 and 40 aren't actually referring to any temperatures here they are actually Saybolt universal seconds its actually a unit of kinematic viscosity the details of which can be found in this link

Saybolt Universal Second - Wikipedia, the free encyclopedia

Now a question might arise in your mind that the link isn't specifying any details about it being used as the designation for the SAE grading system. Actually now, Saybolt seconds are considered obsolete, but they have been used traditionally in the petroleum industry and are common in technical articles. Most of the web pages describe them as viscosity grades only.

As far as the gradings go in a multi grade oil, the grades 20, 30, 40, 50 are obtained from the viscosity readings at 212degree F (100 degree C) and for winter grades at 0 degree F(-18 degree C) used to see the pour point of the lubricant.

The Saybolt furol viscometer is the one that is used to test the oil you put in your car. Fural is an acronym forFuel and road oil.

For a good lubrication the lubricant must actually make up a separating layer and not thin out. Infact it should be viscous enough to form this layer. Lower the viscosity greater the wear. The well known fact is that viscosity changes with temperature. Synthetic multi grade oil 20W40 basically will thin out more at high temperatures than the 20W50 oil(definitely not at 40 degree C).

the values preceding the "W"(meaning winter) are to be low especially at cold startup when the lubricant should be able to flow (thin) for this pour point depressant additives are used in the oils. So for approximate engine oil grade use the chart given by your vehicle manufacturer in your manual book.

Source

but Sir, i just checked with my friends old passion and it shifts without a problem (engine off and at a standstill) also when i was a kid i used to do it in my relative's splendor, actually i feel like there is minor adjustment problem with our newer engines......

Is there any gear shifting problem when u drive? If not then be cool nothing is wrong. I've 2003 cd-dawn and dont have any problem, sometimes i can shift all and sometimes only two. That doesn't seems problem.

If u rotate your wheel both clock standing in a main stand, then u'll able to shift all gears. When u done, come back to neutral without rotating and try again but this time without touching the wheel.

Anyone from Kolkata can clear this guys doubt in the below thread