I have an 02 cbr 600 f4, when i turn my ignition on my low oil light is blinking (the bike is perfecty level). I put a new filter on and all new oils and inspected the level after changing it and warming it up for about a minute and the level is perfect. when the bike is at idol or when im riding it, the light is not blinking. Is there a reset button on the gauges for after you change the oil? Or could the sensor be bad for regulating the oil level? please let me know asap! thanks!

Read the first post http://www.cbr250.net/forum/cbr250-problems-issues/8114-pgm-fi-light.html

you could tilt the bike over on its side at around 45degrees and remove without losing any oil

you need to change your oil and filter.
a clogged oil filter will eventually bypass and let dirty oil through.
if clogged bad it will effect oil pressure by a pound or two and hence the oil light coming on.

if oil and filter are new, then check your code with the service department at the dealer or check your manual to determine what the code means.

Check that the oil pressure switch it working too. The wire may be loose, connecting to the switch itself. Thats usually noticed by a flickering oil light.

If all that is good then you have oil pump issues, oil flow issues, which should be unlikely due to the year.

10w-40SJ Honda Motorcycle oil only.
Would appreciate a rating thanks! Change your oil more frequently if you ride the bike hard or especially if you ride the track like i do...i change my oil before and after a race!! and i"ve put 30k "extremely" hard miles on this engine and still performs well for a bike with 50k on the odometer! my bike is the very first 87 CBRF1 Hurricane.. i also have an 88 with only 16k on the odometer! Hondas are bullet proof, but the oil is the Key because everytime you miss-shift and grind a gear the same gear oil is used to lube the top half of the engine.

It comes on every time the oil pressure falls below a preset level. If you are running out of oil (because the level is low), then 1) shame on you for not checking the oil level frequently! It's not like you have to lift the hood, or anything hard like that, and 2) don't drive it at all until you get some oil in there!

If you have plenty of oil, then you could have a stuck oil pressure relief valve, a blocked oil pickup, a worn out oil pump, an unbelievably clogged oil filter, or an internal oil leak (from a crack, or something coming loose).

In a water cooled car, the water only does 60% of the cooling. Another 20% is by aire passing over the engine surface, and the rest is carried to the oil sump to be cooled by air passing over the pan. Motorcycles have highly finned oil sumps for a reason: They shed a lot of heat through the oil. If you are low on oil, you will be low on cooling, too.

If you fill up with oil, but you still overheat, you probably have an excessively lean fuel mixture. If that is the case, and you let that continue, this bike won't last very long.

I just checked and found that this is a water cooled engine. So yes, you probably need coolant -- check into that right away. If the water pump gets dry even for a split second, the seals (lacking the lubrication that the water provides) will be destroyed -- it happens instantly.

Generally any big bike can hold up to 3.5L oil with filter change.
Rule of thumb when changing oil and filter is to fill the crankcase with about 2.5 - 3L oil and check dipstick on oil filler neck for indicator as it's normally marked high and low (max or min oil) that cn be in crankcase.
If good enough and answer your question just give a 4 thumbs up. Thanks

Hi there , great bike  by the way.... Okay so you just bought a nice bike, the best thing to to is to assume that it hasn't been done, One thing is for sure the bike shop 9 times out of 10 will not spend much on a trade in and people that sell their bikes usually don't service them before they sell them which leaves you in limbo land so, if the bike is running well then great buy your self a new oil filter and oil , (check owners manual or ask at the bike shop when you buy the oil but if it was me i would used the Motul full synthetic considering the amount of miles the bike is only just run in so she will be a bit tight.
To check the oil it is easy .
First kick her over and let her run until she's at operating temperature, (don't rev it hard or any thing let it do it by itself, once this is achieved , stop the bike , put the bike on its dual stand (if fitted) if your bike has not got one then hold the bike level , now on the motor there is a black twist grip plug , with finger grab face on it , unwind it out and you will see a dip stick , on the dip stick there is two markings , one is the low level the other is the fill level , anywhere below  half way should be topped up no higher than the top mark on the stick, remember the bike must be level,
To change the oil and the oil filter its just a matter of placing the bike on its main stand ( again if your bike only came with the side stand it means that the drain plug will be located on the left side of the bottom of the motor and is usually easy to find) and in most bikes they design the fairing around it so you don't have to remove any covers , and same for the oil filter ,
I hope this info helps you , if you need a more in depth look at how to let me know 
Regards
Roadrunning1 

Oil should be changed every 2 to3K miles. Anytime i buy a used bike i drain the oil right away cause u never know what might be in there...I recommend Castrol Syntec Actevo 10-40 wt. motorcyle oil..buy 4 qts...Put bike level on level ground and after you have drained oil and spun on a new filter...put in 2 qts...then check dipsticks (crisscroos marks on bottom of dipstick should be covered in oil when oil is full) slowly top off checking dipstick frequently so as not to overfill...proper dipstick check is to unscrew stick, wipe it off and reinsert without screwing it in, when oil is to top of crisscross you are full...My friends 2002 F4 has a sight glass NOT a dipstick so incase that's what you have watch oil level in sight glass (should be 1/2 to 3/4 full) Drainplug is under engine and is 17 mm...Good Luck to you friend....Tim

hi . its always good to run synthec oil. id put gp1 10w 40 or ask you local bike shop whats good . its always free to ask a question.

http://www.carlsalter.com/motorcycle-manuals.asp

get a free pdf service manual for your bike here. you should find out how to remove the ignition. or if you have a seat lock that is easier to remove take that to a locksmiths to get new key cut