Hey, I've just about gone nuts trying to solve this problem... pretty much on the verge of giving up and calling a mechanic. Thought I might throw it open to everyone and see if ive missed something. I recently bought a CBR250R(K) Originally it took a while to warm up and being new to non EFI engines i used the throttle as well as the choke to start it. This wasn't a problem right away but everytime I went to start it it would get progessivly harder to start. So... more choke and more throttle. (Stupid I know) The last time I rode it... after I realised I should stop using throttle while the choke is on, it was still difficult to start but got going and I rode it for about 30 minutes. Since then it hasn't strted at all. After doing some reading I came to the conclusion ithat i've either: 1) foiled the plugs 2) flooded the carburetor 3) flattened the battery and was charging it with the wrong charger 4) or... bought a crap bike So... I've replaced the plugs and checked that they spark Used a multimeter on the battery. Shows 14v. removed the air filter - which has a little effect when i fully open the throttle (I can hear some actual firing) And come to the following conclusion I've flooded the carburetor or There's a battery problem still. This is the bit that's confusing me: I've checked the battery so it seems like it's most probably the carbs. BUT the manual says if your spark plugs are wet (which the new ones now are) its an ignition problem ie not getting spark (but i am). So... is it possible to get too weak a spark. (My charger works at 4amps and the battery is recommended for 0.6A - 3A max) But still have correct voltage? Or does this sound like the carbs? Or... should I just replace the fuel... Ive heard of people that have had problems starting they're bikes and replacing the fuel has worked. Seems weird though cause the fuel was alright last time I rode it. Would appreciate any advice anyone can offer. Thanks.