"cos just in case u got a wear out overflow pin"
erm.. yup.. i guess you're supporting my view on faulty components
from the tank to the flat bowl...
"if u all can see from ure carby outlet to ure engine side... there
is a lilttle tube which leads to a reservoir which is usually
located either on top or at the top side over ure engine... this
reservoir is actually to stored ure excess fuels so as to
compensate the event where by u can slow down and speed up fast
without encountering any hip cups."
erm.. which bike/carb are you referring to? is it on yours? or a
bike you owned? hmm.. i could be wrong, but the only reservoir i
know of connected to the carb is either the fuel tank, or the 2T
pump.. is it connected to an oil reservoir of some sort? don't
understand the reservoir part. how would your bike have excess
petrol coming out of the carb when your bike is running? and in
liquid form? 
don't see how having this
reservoir will allow speeding up from a slow down. how is this
liquid petrol in the "reservoir" atomized? or does this "reservoir"
dump the petrol in liquid form into the venturi (hence potentially
flooding the cylinder, leading to a dying engine as opposed to a
higher revving engine)???
"when ure startin the engine... there wont be 20kv so its best not
to open throttle and start unless ure sure that its wise to do
that."
will check up on the insufficient voltage part... though i'm a
little sceptical about this... the current/e.m.f comes from the
alternator, goes through the CDI and gets boosted by the H.T.
coil.. i mean.. if the starter motor or kick start mechanism is not
designed to produce the minimal rpm (hence voltage after you go
along the chain i've just described), how are we going to start the
bike?
not too sure about what you mean about the sparking. a spark is a
spark, and can ignite gaseous petrol because it is at flash point.
perhaps i'm a little rusty about the heat capacity of a spark or
flash point.. but from what little i know, i think a spark
generated by a proper working spark plug should be able to ignite a
correct air/fuel mix. as for improper ignition issues like faulty
plugs, such as corroded electrodes, incorrect electrode gaps, and
other inherent manufacturing defects, we leave it aside. but i do
think a proper spark plug can provide a spark enough to ignite a
correct air fuel mix. of course i base this on the assumption that
the bike engineers are smart enough to use a starting motor or kick
start mechanism capable of producing a minimal rpm to spark (within
possible human limits when kick-starting). i believe the key to
ignition failure when the spark plug is working lies in the
air/fuel ratio. this can get modified despite proper jettings, esp
when starting. such as, a too rich mixture (insufficient oxygen to
support combustion) or when liquid petrol from the "reservoir" you
described gets dumped into the cylinder, or too lean, especially in
the mornings (condensation of petrol. (the choke cuts air flow from
the venturi so that saturated petrol vapours enters the cylinder)
of course, if the cylinder is flooded to start with, the choke is
going to make it worse...
anyway, as for what really causes flooding, be it the degree of
saturation (air/fuel ratio) of petrol in the air, or liquid petrol
flowing into the cylinder, i dunno, can't comment too much on
it...
heh.. must say we think alike on the faulty components along the
fuel tank ---> carb chain... ah.. the rest leh.... 
