20 Most Recent 2008 Yamaha YZF-R125 - Page 7 Questions & Answers

it sounds like a flat battery

Simple. Remove the screw holding the bezel of the headlight (the chrome ring around the outside of the headlight), lift up from the bottom, the bezel is held on by a tab on the top. Disconnect the plug on the back of the light. Don't worry it can only go on and off one way. If you have the old old type you replace the whole light, most likely it just a bulb, which you move the rubber boot out of the way and turn to disconnect. When you put a new bulb in be oh so careful to not touch the glass on the new bulb-oil on your fingers will cause the new bulb to blow the second you turn it on. IF you do accidentally touch it, wipe it off with alcohol. I wipe them off anyway, why not. Twist back in and re assemble.

Check compression first and if over 125psi then look for problem in the caruration system. Check for a clogged or gummed up main jet. Clean good and set to factory specs and should be ready to good. Also install a new spark plug!

Try replacing your camshaft sensor or throttle position sensor

depends on a matter of causes, was the tank full or empty? or halfway? have the fuses been checked? from what you seem to be describing (although its a bit hard and im having to guess wildly) if the tanks low, its sucked some **** through the fuel system and blocked an injector.or it could be something totally out the ordinary and an oilway has been blocked and its in a failsafe to prevent further damage.give me some more details and i may be able to help a bit furthere.g. speed, fuel used, any other weird problems

its starving of fule running week, it revs standing still but under load it dieys,, clean out all fule lines and taps jets or what ever,,,,also check air fillter,, and spark plugs,,

Check your ignition components for condensation. If you wash the bike using water especially around the motor, you should promptly dry it thoroughly before starting it to avoid the possibility of condensation caused shorts in the ignition system. I personally use a leaf blower to dry mine and let it sit in the sun for a while to make sure it's dry. I think you will find condensation is your problem. Good luck and safe riding.

is the bleed nippel on top of brake or bottom.

Hi Davidroyal, because you do not specify what type of Yamaha is I'm just sending you this electrical diagram of the XJ'S that I have for a while and may be can be usefull for you.
Good luck mate.

Can you be more specific? Do you mean how to replace or just what is the question.

its probably your fuel filter... When a motor sits with fuel for a while it will begin to varnish which will clog the fuel filter and sometimes cause the float or jets to stick or get clogged. But if it works with the fuel line detached I can almost promise its a fuel filter issue. If that doesnt clear it up check the petcock valve at the tank.

Unlikely too.

hi if this is a 12 or 13mm nut, torque between 12 & 16 ft max

Sounds like either a broken oil piston ring' or if it has overhead valves, a blown oil valve guide seal

got yz 125 *4xm-006347* need too now whot year my bike is

Please clarify what year, make, and model?