I didnt get one thing.. in eco mode, with sudden burst of acceleration, the point of combustion moving toward TDC, why does it cause knocking ??
Isnt that how you explained power mode works (with spark at TDC)?

And i'm not much into mechanical engineering so i cant comment anything, (only studied a bit in first year) but have you tried verifying any of this ?
(like check the exhaust gases in both modes to see if its different for example )

when the ignition timing(time of sparking) is retarded we will get good fuel economy, and when it is advanced we will get more power.

in engine spark plug initiate the spark at the end of compression stroke(before piston reaching TDC), and combustion starts after piston reaching TDC, this small time period between the two event is called ignition lag

considering economy mode: spark plug initiate the spark well before TDC (20-25deg before TDC), Combustion starts immediately after TDC. But as we get the peak pressure pulse near TDC, there will be not much effect in the crank shaft(Mechanical advantage is almost zero in this position for this piston crank mechanism), But the heat released in the combustion is utilized atmost as it has more time after combustion till exhaust stroke.

power mode: spark plug initiate the spark almost near TDC, so the combustion starts well after TDC (around 40deg after TDC), at this instant it has better mechanical advantage, due to this the pressure pulse pushes the piston downwards. But there is no much time period inbetween combustion and exhaust stroke to utilize most of its thermal energy.

In short
1. in power mode, the engine is high revving and less efficient (exhaust gas temp carries most of the heat).
2. in eco mode, the energy is utilized better than power mode,
3. as in eco mode engine is running in dedicated mode, if sudden burst is given
the point of combustion moves towards TDC, pressure pulse cant be utilized in moving piston, instead it dissipates on engine casing, which we hear as harshness, knocking, engine beat while accelerating

Are u sure that these modes play an active role and are not just indications???
Because when i asked Suzuki people (Big Guys) They said it has nothing to do with engine.....
Why would they say that????
Any source for ur info?????

Even if they knew it, they thought us as simple people(not having much knowledge to understand the concepts), so they simply told there was no difference.

take this check have one water soluble marker pen. position your accelerator around 10 to 20% of full throttle position.

draw a line on the accelerator and its holder(just to mark its position)

1. just switch on the engine, set it in eco mode, turn the accelerator to that marked position, note the engine speed

2. now set it in power mode, do the same procedure and note the engine speed

Now you will know the truth

I don't think the sound from front disk break is not only dust particles because am driving my bike in such a dusty area and I never experienced sound from disk break moreover have a cement shop in front of my home just assume the quantity of dust in the form of minute cement particles even though still my disk break never screamed till date. .

Anup & shiva thanks for the detailed definition on the modes. Seems Castrol power 1 can't last more than 1000 kmsNow I crossed 850 kms on castrol power 1 and the oil color is getting darker day by dayI believe it won't work for GS150R coz I put the same thing for my splendor and its going good (crossed 2'K ) have one more month to reach 3 rd service after which planned to switch to motul or gulf mineral based oil@ adi I don't think the sound from front disk break is not only dust particles because am driving my bike in such a dusty area and I never experienced sound from disk break moreover have a cement shop in front of my home just assume the quantity of dust in the form of minute cement particles even though still my disk break never screamed till date. . Hey did any one tried to modify rear to disk break if it is possible with out major ateration I will definetly give a try

Msn1,is castrol power 1, semi synthetic oil of 10w40? or different?

Thanks for mentioning about engine oil, I was going for Castrol power 1 as its the only brand that Suzuki recommends. About the oil getting dark, I think its because the engine is still new, may be it will reduce with another oil and filter change.

Even if they knew it, they thought us as simple people(not having much knowledge to understand the concepts), so they simply told there was no difference.

take this check have one water soluble marker pen. position your accelerator around 10 to 20% of full throttle position.

draw a line on the accelerator and its holder(just to mark its position)

1. just switch on the engine, set it in eco mode, turn the accelerator to that marked position, note the engine speed

2. now set it in power mode, do the same procedure and note the engine speed

Now you will know the truth

@Mathew The other day during my 2nd service i asked the service guy about chances of changing from tube Tyre to tubeless Tyre......He said that the gs alloy rim is made for only tube tyres...if you want to change to tubless one than you have to change the alloy rim itself to a tubeless one......

i don't know how much true it is.......suggestions are always welcome from experience riders.....

Thanks bro, for giving such a detailed explanation. So like advancing the opening of valves, we can do the same with the ignition timing. This kind of information is really hard to get.

So in short in economy mode all the drawn fuel is fully utilized while there is some loss in power mode as exhaust valves open before the piston reaches the BDC. So this ignition timing, opening of valves and optimization cannot be achieved in all rpm, some trade offs are always necessary depending need of user.

@ Falcon

The four cycles, influx, compression, combustion and exhaust. The only power cycle is combustion cycle, all the other cycles the inertia of the crankshaft with the balancer and flywheel.
First stroke: Inlet valve opens, outlet valve closes air-fuel mixture drawn into cylinder by the downward motion of piston.
Second stroke : Both the inlet and outlet valves are closed, the piston moves from the bottom most position(BDC) to topmost position(TDC).
Third stroke: When the piston reaches the TDC both valves are still closed, spark plug fires and ignites the fuel pushing the piston down. Fourth stroke: Outlet valve opens, piston moves from BDC to TDC pushing all the gases out of cylinder.

Of these four strokes, third one is the power stroke,so to smoothen the rocking power delivery flywheels and balancer shafts are used. The opening and closing of valves exactly when the piston reaches the TDC and BDC is only an ideal condition. So the inlet valve is opened even before the exhaust stroke is completed and similarly the outlet valve is opened before the piston reaches the BDC, since the gases cannot move in and out of cylinder.

Now going to ignition part, when the piston is moving from the BDC to TDC its doing some work as its compressing the air fuel mixture. But in ECO mode the spark plug fires before the piston reaches the TDC, so while the piston is yet to reach the TDC and now the fuel has started to ignite and are expanding this creates an imbalance since the piston cannot move downward before reaching TDC. Even the flywheels cannot smoothen such sudden irregularities. So this causes some sudden vibrations. I'm not an expert in this is just a logical explanation.

@ Thunderstorm

Welcome to the community bro, glad to know that you are safe after the crash. Its trully unbelievable to be able to ride so much even though you are a minor. From what you have a small built,if you were in my place you would have given up riding ( Fine by Mamus). How can you claim insurance if you dont even have license? Man I know its fun, but refrain from driving untill you turn 18.


The speed sensor is placed on the transmission (primary sprocket).



Dust get collected in the brake pads, and this is what causing the sound. So while you do regular washing, apply some water in pressure and rotate the front wheel.



I think Japanese don't believe in marketing.