Topping up coolant levels on a ninja 05

tighten or replace

make sure that the thermostat is working and opening to let the flow of water in the engine, if it's ok you should start it and let it warm up and see if the cooling fan starts when temperature reaches close to 98 degrees, is it doesn't and the coolant boils then you have to change the temperature sensor as it is faulty.

Frame number(VIN) is stamped on the yoke behind the headlight. You have to turn the handle bar fully in order to see it on the frame. The engine number is stamped on top of the lower half of the engine behind the cylinders (basically on top of the gearbox)

take tank off,remove air box, and follow wire from coil to top of motor,pull up on spark plug wire,the spark plug is inside about 3 to 4"down inside of hole.

http://bikerpunks.com/media/other_files/15021361-Kawasaki-Ninja-250-Service-Manual2.pdf

you can change the sprockets.If you go to a 16 tooth front sprocket. two teeth on a front sprocket is like droping 4 teeth on the rear. You could drop 2 teeth on the rear sprocket but a 43 tooth is probably harder to find. the usual choices for front are 14,15,16 tooth.
For the rear they are 44,45,46 tooth

The way to remeber gearing changes is on REAR sprocket is smaller=faster and larger=slower top end.
the FRONT is OPPOSITE to the rear smaller=slower and bigger=faster.
You may have to lengthen or shorten the chain depending whjch way you go.

Depends if the oil and filter and oil cooler have been dismantled. If not and only the old oil has been drained it should be approx 4lr's, should state this under the oil filler as a guide. If its a complete strip down and rebuild your'll need at least 4.5ltr - 5ltr's so put in 4.5 and run for 5 mins, then check level

Try blowing out the radiator with compressed air into the rear of the radiator--bugs and other stuff can block air flow.