In an Engine the valves open and fuel comes in, it burns and gas is thrown out from the other valve. This is how a 2 valve system works

But in 4 valves, fuel comes form 2 valves and the gases dumped out from other two(pros correct if wrong)

it results in better combustion also the burnt gases can be thrown out more
efficiently and faster allowing the engine to rev higher and faster.

Having 4 valves (2 IV and 2 EV) as opposed to having 2 valves (1 IV and 1 EV) serves by efficiently filling up and also emptying the engine cylinder. It improves the breathing of the engine (higher Volumetric efficiency) . Thus, more charge can effectively pushed into the cylinder which results in a higher power output and flatter torque curve of the engine.

If one bike doesn't have a kicker or one does, it would be difficult to start the engine ?

Indian bikes doesn't have a kicker
P220 DTS-FI(If in production)
Karizma ZMR
CBF Stunner PGM-FI
R-15
& Ninja 250 R(Does it comes under Indian bike?)

Indian bikes have kicker
Glamour FI(if in production)
RTR 160 FI
Classic 500 FI

If a bike doesn't have a kicker when the battery fails, when you try to push-start if it's not starting then what to do ?

When a bike have a kicker when the battery fails, When you try to start the engine with kicker will it start ? If it doesn't start in-case it have a kicker,What would be the result ?

I had this doubt for a quite long time.

^^ bikes like R15, can be started with a slight push in second gear if the battery is weak.

It depends on the electrical circuit of the bikes, the older ones could be started without battery even, but now a days, a basic connection to a battery is needed to complete the circuit.

The ignition is powered by the magneto. So when you are kicking the bike to life, even if you have a weak battery, the magento can charge the capacitors in the CDI to generate the spark for the engine to start.

Have seen these "DUMB" conversions but only on 4 wheels and 90% of them were the good ol ZENS.

thanks for the info man!!

so according to this the cylinder filling capacity and the emptying capacity increases in the 4 valve compared to the 2 valve!!!!

you mean that if the r15 battery drains out then u will have to put the bike in second gear then pull the clutch and push the bike for some dist and release the clutch for the bike to start???????

^^ yup pretty much

Ask me. I have push started my bike 4 times in two days. That was when I came back from a long ride, left my keys with ignition on and covered it up. After 7-8 days I wanted to take the bike out, couldn't find the keys, took spare key and went to the bike to realize the keys were on the bike and battery is dead. The very short 2-3KM rides those two days didn't charge the battery enough to self start it again. Had to push the bike. It starts very easily.

Fuel selection

More and more Indian bikes are now coming with FI option, also there are many choices of fuel..like xtra premium from IOC and speed BPC. Both these branded gasolines contain cleaning agents and friction busters and claims to be better burning fuels. while IOC in their website says that xtra premium is a better option for new generation cars it says nothing about the use of same in bikes. Usually its understood that high octane petrol's like xtra premium and speed are good options for engines with high compression ratrios and F1 engines are comparatively high compression engines. however, there are fundamental changes between a car engine and bike engine.

Is it advisable to use high octane petrol in new generation indian F1 bikes? unlike a car engine where combustion chamber and gear box are separated and is lubricated differently bike engine is one unit and same lubricant is used to cool and lubricate all the component including pistons and gear box (this is why using car lubricant with friction busters are not at all advisable as bike engine oil). in such a situation is it advisable to use petrol with friction busters ? also how does the cleaner burning fuels perform in FI bike engine? can anyone throw some light on this?

I have been using BPC Speed since the day I bought the bike, I have not faced any problems till date. I have used it in my previous bikes (carburetor) and not face any problems. Actually, the friction modifiers used in petrol are quite different from the ones present in car oils. The car oils mainly have molybdeum as friction modifiers, whereas petrol contain Polyetheramine and Polyetheramine derivatives, that too in very low concentrations. Whereas friction modifiers in oils is a problem because of the wet clutch system bikes have, friction modifiers in petrol do not get the time to contaminate the engine oil as they burn during the ignition process.

Would you point out some of the operational or functional changes between a car and a bike engine ?

Cleaner burning fuels in FI perform in a manner thats similar to the way they perform in carb engines.

lol..both are the same man.
2-valve and 4-valve engines work on the same principle, its just that the volume of the mixture entering the combustion chamber is higher and hence make more power.

hehehe i just cant beleive that they all work the same JOE. hehehe

LOL my bad, i meant it comes and goes out from TWO instead of ONE
so that the volume and speed of going and coming is more