fuel tap on/off
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hi guys, do u off ur fuel tap whenever u park ur bike?
anyone got experience carb overflow b4?
seems that when i off the tap, start that time must warm up longer to let the petrol in
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Unless got people trying to be funny go turn ur throttle, the fuel won't overflow. But i always close one. Warming up standard one what. I never feel the difference.
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last time my aprilia muz off, coz will overflow, as petrol can be seen coming out of the overflow tube at the carbOriginally posted by WhitePhantom:hi guys, do u off ur fuel tap whenever u park ur bike?
anyone got experience carb overflow b4?
seems that when i off the tap, start that time must warm up longer to let the petrol in
now my Fz no need
and i dun get wad u mean by muz warm out longer,
coz still got petrol in ur carb
mah, if not petrol go in, ur bike would have died -
u riding fz or fzr? issit the fz is a Vtwin 4 stroke naked bike??Originally posted by ah_tee:last time my aprilia muz off, coz will overflow, as petrol can be seen coming out of the overflow tube at the carb
now my Fz no need
and i dun get wad u mean by muz warm out longer,
coz still got petrol in ur carb
mah, if not petrol go in, ur bike would have died
i saw one malay guy riding it from my work place there, dun know the model until someone told me...
old bike rite? -
sorry, me riding FZR, jus now neber say properlyOriginally posted by WhitePhantom:u riding fz or fzr? issit the fz is a Vtwin 4 stroke naked bike??
i saw one malay guy riding it from my work place there, dun know the model until someone told me...
old bike rite?
FZR is a fairing bike,
FZ is a naked bike
yesh, my bike is 4 stroke v-twin
yesh, its old,err.. FK consider old?
my workplace there got an old old katana, but still in gd shape
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a black katana 750? FH plate?Originally posted by ah_tee:my workplace there got an old old katana, but still in gd shape -
Ok lah, at least newer than tzr...Originally posted by ah_tee:sorry, me riding FZR, jus now neber say properly
FZR is a fairing bike,
FZ is a naked bike
yesh, my bike is 4 stroke v-twin
yesh, its old,err.. FK consider old?
my workplace there got an old old katana, but still in gd shape -
I always turn off my fuel knob whenever I park my bike. You never know what will happen to it when you are away.... Someone might knock over your bike, then....you can kiss your fuel goodbye....and also, if there's a leak and you leave it unattended, also goodbye.
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i have tried leaving it on for a certain period n also leaving it off.
wat i get is: i got more mileage if i turn it off while parking, n vice versa.
i not sure whether petrol leaking or got 'evaporated' -
its black, but i think its FC, always at one coffeeshop near diamond industries at macpherson areaOriginally posted by ShunLi:a black katana 750? FH plate? -
not realli la, TZR also got FJ mahOriginally posted by RAIDER:Ok lah, at least newer than tzr... -
Isn't fk newer than fj???Originally posted by ah_tee:not realli la, TZR also got FJ mah -
eh i did discuss this issue with my friend before, but wanna hear you guys' views... cos we have no conclusion still.. hahhaa...
the fuel tank is connected to the carburettor flat bowl via the fuel inlet tube. the fuel petcock is located on this tube, so you can set on or off. when the fuel in the flat bowl fills to a specific height (preset by your float height), it pushes up on the floats, which activates the float valve to close off the fuel inlet. so no more fuel comes in from the fuel tank, and the level of fuel in the flat bowl is constant.
when your engine is DEAD/NOT ON/NOT WORKING, there is no pressure difference in the venturi... unless the itchy hand prick playing your bike's throttle go kick in gear and push start i dunno lar.... but the thing is, when your engine is not moving, there is no pressure difference in the carburettor venturi. twisting your throttle has two mechanical functions in the carb: pulling up the jet needle, and throttle slide. even as the main jet is fully open, when there is no pressure difference (cos engine IS NOT RUNNING), how would your cylinders flood? petrol evaporates yes, but to the extent of flooding the cylinders???
so i got a few questions i discussed with my friend:
if the engine is not running, i.e. no pressure diff in the venturi, twisting the throttle only opens the main jet and throttle slide, yes the venturi passage is opened, but there is no airflow, how is that petrol will defy gravity and come up through the main jet from the flat bowl(s)? yes evaporation occurs, but i believe not to the extent of flooding your cylinders. at most, the venturi and the cylinder will be saturated with petrol vapour, but that won't cause flooding right?
secondly, the flat bowl will never overflow, assuming that your floats and float valve are working and properly set...
eh if there's anything i've missed or got wrong, feel free to tell me ya???! really quite interested to hear views on this...
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oh yes, and how do you guys cure the "tiong you" situation, or engine flooding situation?
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faulty float valves/incorrect float height on your aprilia?Originally posted by ah_tee:last time my aprilia muz off, coz will overflow, as petrol can be seen coming out of the overflow tube at the carb
now my Fz no need
and i dun get wad u mean by muz warm out longer,
coz still got petrol in ur carb
mah, if not petrol go in, ur bike would have died -
hmmmm, we all seem to think that the flooding occurs when the bike is in a state of rest, but then, i just got the thought that maybe, it occurs when you're starting the bike.
your float bowls are filled to the brim with petrol, and when you start your bike, the piston moves causing more petrol to be sucked in thus slightly flooding the carbs, there isn't enough air to sustain the ignition, the engine stalls, and there is excess petrol in the carbs.
rinse and repeat, and you get a flooded carb.
of course, this is just a theory and i could be wrong -
Yeah.... no need to warm up longer .... just pull ure choke and ride out of ure carpark and u can close the choke back....Originally posted by WhitePhantom:hi guys, do u off ur fuel tap whenever u park ur bike?
anyone got experience carb overflow b4?
seems that when i off the tap, start that time must warm up longer to let the petrol in -
Originally posted by l3stat:eh i did discuss this issue with my friend before, but wanna hear you guys' views... cos we have no conclusion still.. hahhaa...
the fuel tank is connected to the carburettor flat bowl via the fuel inlet tube. the fuel petcock is located on this tube, so you can set on or off. when the fuel in the flat bowl fills to a specific height (preset by your float height), it pushes up on the floats, which activates the float valve to close off the fuel inlet. so no more fuel comes in from the fuel tank, and the level of fuel in the flat bowl is constant.
when your engine is DEAD/NOT ON/NOT WORKING, there is no pressure difference in the venturi... unless the itchy hand prick playing your bike's throttle go kick in gear and push start i dunno lar.... but the thing is, when your engine is not moving, there is no pressure difference in the carburettor venturi. twisting your throttle has two mechanical functions in the carb: pulling up the jet needle, and throttle slide. even as the main jet is fully open, when there is no pressure difference (cos engine IS NOT RUNNING), how would your cylinders flood? petrol evaporates yes, but to the extent of flooding the cylinders???
so i got a few questions i discussed with my friend:
if the engine is not running, i.e. no pressure diff in the venturi, twisting the throttle only opens the main jet and throttle slide, yes the venturi passage is opened, but there is no airflow, how is that petrol will defy gravity and come up through the main jet from the flat bowl(s)? yes evaporation occurs, but i believe not to the extent of flooding your cylinders. at most, the venturi and the cylinder will be saturated with petrol vapour, but that won't cause flooding right?
secondly, the flat bowl will never overflow, assuming that your floats and float valve are working and properly set...
eh if there's anything i've missed or got wrong, feel free to tell me ya???! really quite interested to hear views on this... -
erm ok,... i sort of get what ure asking... first i say about closing the fuel tap... its a good practice... closing it after u park ure bike, Y , cos just in case u got a wear out overflow pin. and what effect will this cause>>> fuels over flow from carby. Ok now for the cylinder block flooding thingy... this one will have to depends on individual rider..>>> for eg. some riders may not know how to control the throttle or amount of fuels going into the engine when startin... they may have open slightly abit more which the heat from the sparks is not sufficient to ignite the fuels and this would starts floodin...>>>eg. 2 some rider likes to go fast and stop... 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. Those riders who have this habit... often have excess fuels in that reservoir and this may leads to floodin too... eg.3 there are oso some riders who like to off the engine and open the throttle at the same time.... this is a big NO NO. Cos y,... its becos when ure doing this... often u will have a lots of unburn fuels left in ure cylinder block. This will confirm cos floodin especially if the weather is cold. Now pls note that a normal ignition coils only produce about 20k volt to 25k volt to burn fuels and these values will only be reach when the engine is running 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. If there are any opinion i would like to hear too. Hope what i said can help u guysOriginally posted by l3stat:eh i did discuss this issue with my friend before, but wanna hear you guys' views... cos we have no conclusion still.. hahhaa...
the fuel tank is connected to the carburettor flat bowl via the fuel inlet tube. the fuel petcock is located on this tube, so you can set on or off. when the fuel in the flat bowl fills to a specific height (preset by your float height), it pushes up on the floats, which activates the float valve to close off the fuel inlet. so no more fuel comes in from the fuel tank, and the level of fuel in the flat bowl is constant.
when your engine is DEAD/NOT ON/NOT WORKING, there is no pressure difference in the venturi... unless the itchy hand prick playing your bike's throttle go kick in gear and push start i dunno lar.... but the thing is, when your engine is not moving, there is no pressure difference in the carburettor venturi. twisting your throttle has two mechanical functions in the carb: pulling up the jet needle, and throttle slide. even as the main jet is fully open, when there is no pressure difference (cos engine IS NOT RUNNING), how would your cylinders flood? petrol evaporates yes, but to the extent of flooding the cylinders???
so i got a few questions i discussed with my friend:
if the engine is not running, i.e. no pressure diff in the venturi, twisting the throttle only opens the main jet and throttle slide, yes the venturi passage is opened, but there is no airflow, how is that petrol will defy gravity and come up through the main jet from the flat bowl(s)? yes evaporation occurs, but i believe not to the extent of flooding your cylinders. at most, the venturi and the cylinder will be saturated with petrol vapour, but that won't cause flooding right?
secondly, the flat bowl will never overflow, assuming that your floats and float valve are working and properly set...
eh if there's anything i've missed or got wrong, feel free to tell me ya???! really quite interested to hear views on this... -
more of like worned pilot jetOriginally posted by l3stat:faulty float valves/incorrect float height on your aprilia?
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i heard the best way to solve tiam you is to if ur bike can start, start n close fuel, let the petrol in the carb flow finish
if cannot start, turn to reserve, full throttle all the way, then start
dun ask me the theory behind it, this is wad i see my friend do one
ar bo is to smoke, then when smoke finish throw the cig butt inside the fuel tank -
LOL! find an ah-beng to throw for you! hahaha...Originally posted by ah_tee:ar bo is to smoke, then when smoke finish throw the cig butt inside the fuel tank
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"cos just in case u got a wear out overflow pin"Originally posted by HighwayAngel:erm ok,... i sort of get what ure asking... first i say about closing the fuel tap... its a good practice... closing it after u park ure bike, Y , cos just in case u got a wear out overflow pin. and what effect will this cause>>> fuels over flow from carby. Ok now for the cylinder block flooding thingy... this one will have to depends on individual rider..>>> for eg. some riders may not know how to control the throttle or amount of fuels going into the engine when startin... they may have open slightly abit more which the heat from the sparks is not sufficient to ignite the fuels and this would starts floodin...>>>eg. 2 some rider likes to go fast and stop... 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. Those riders who have this habit... often have excess fuels in that reservoir and this may leads to floodin too... eg.3 there are oso some riders who like to off the engine and open the throttle at the same time.... this is a big NO NO. Cos y,... its becos when ure doing this... often u will have a lots of unburn fuels left in ure cylinder block. This will confirm cos floodin especially if the weather is cold. Now pls note that a normal ignition coils only produce about 20k volt to 25k volt to burn fuels and these values will only be reach when the engine is running 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. If there are any opinion i would like to hear too. Hope what i said can help u guys
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....
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ah... good point... i didn't think of that... you just armed me with a new question to bombard my trusty mech with... hahhaa...Originally posted by nismoS132:hmmmm, we all seem to think that the flooding occurs when the bike is in a state of rest, but then, i just got the thought that maybe, it occurs when you're starting the bike.
your float bowls are filled to the brim with petrol, and when you start your bike, the piston moves causing more petrol to be sucked in thus slightly flooding the carbs, there isn't enough air to sustain the ignition, the engine stalls, and there is excess petrol in the carbs.
rinse and repeat, and you get a flooded carb.
of course, this is just a theory and i could be wrong seriously, quite possible, but i gotta ask a pro, cos i also dunno what degree of saturation of petrol causes "flooding"...
back to your point, your float bowl won't be filled to the brim unless your floats or float valve is faulty right?!? yeay.... one more vote for faulty mechanisms along the fuel tank ---> carb chain!! -
Originally posted by ah_tee:more of like worned pilot jet why ah? explain leh...