Question about 2003 Suzuki RM 125
Try another spark plug.
Also, make sure you have a clean air filter, and good compression.
If all is well and it runs rich, (Plug burns black) You need to go smaller on the jetting.
Your plug should burn chocolate brown in color. Run it at an idle for 10 minutes, then remove the plug...white is too lean, (Needs bigger pilot jet) and black is too rich. (Needs smaller pilot jet)
Now run it 3/4 throttle (Riding it) for around 10 minutes, and shut it off and check the plug again. This works the same, but for your main jet. Note... this is for two strokes.
Posted on Oct 12, 2010
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Posted on Jan 02, 2017
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