No spark cold on rm 125

I would use a NGK Platinum Plug (R6918B-8 or BR8EIX/BR9EIX) and try to cut back a little on the oil mixture to gas ratio or adjust the gap a little hotter.

You may simply just need to adjust your clutch cable. Make sure it feels like your pulling on something, there should be some resistance. Since you'll be adjusting it while the plates are cold you need to leave some free play in the lever or when your clutch pack gets hot it will start slipping and you'll end up with a smoked clutch. What I mean is grab the lever and pull it in until you start feeling resistance and then adjust it our until there is maybe a quarter inch of free play. Hope it helps. If its not that then you've got some internal problems with your plates and fibers not separating correctly.

Your black ignition box may have gone bad. Or your stator plate came loose and changed your timing.

Could be a bad coil, coil wire or module. The module converts the pulses of the stator so the coil knows when to spark. Bad coil = no spark. Bad coil wire = no spark to plug.

try changing gas . dont forget to empty out carb bowl also check for spark might have a fouled spark plug .

Hi and welcome to FixYa,

Initially, test for the presence / absence of below described voltages using an analog / needle type voltmeter when starting the bike:

• pulsating low AC voltage coming from the pickup coil;
• pulsating voltage feeding the ignition coil.

Good luck and thank you for asking FixYa.

check if there is spark/fuel then try to bum start as engine will turn over alot longer than with a single kick.

hi fellow rider, you may want to check on the links below:

http://www.thumpertalk.com/forum/archive/index.php/t-726715.html

http://www.allthingsmoto.com/forums/f-62/rm-125-wont-start-31198/

http://answers.yahoo.com/question/index?qid=20081201165114AADfYoC

Turn the air screw and throttle screw all the way inward. IMPORTANT > do not tighten these two adjusters down. Only screw these in until they LIGHTLY seat. Now turn each adjuster one and one half turns outward. The carb is now set back to factory specs assuming no one has changed out the main jet or played with the float level..

Please rate this solution. Thanks!