Re: Yamaha 250 Ticking Sound?
your motor is broke, fix it.
if you check your ign timing you will most likly see its fixed at 7* BTDC instead of 6* ATDC.
this will indicate the ECU isnt recieving the correct signal from a sensor.
also could mean some backyardigan removed the thermostats.
could be anything from a stuck/missing t-stat to a failed sensor or a dissconected knock sensor.
if you get a code 9 though I know what it means and for the right price ill tell ya.
dont bother calling Yamaha cause they will tell you the ECU isnt programmed to display a code 9 but trust me it can.
almost any sensor failure or out of range reading will result in timing being fixed at 7* BTDC and fuel enrichment fixed rich.
missing or stuck t-stats will fix timing to no lower than 5* BTDC fuel will go rich by about 20% and top speed can normally be reached.
idle speed will increase.
the tuneup spec guide,the winy blinky and an understanding of how the ECU reacts to sensor inputs,or lack of, will be critical for timely testing and no parts shotgunning.
