There are numerous common issues that arise when servicing dirtbikes and motorcycles, and one such issue occurs when the spark plug becomes saturated with oil and then fouls. This often occurs because of use of incorrect 2-stroke oil used in the engine. In most standard 2-stroke engines, Yamalube 2R or Yamalube 2S oil work the best. To correct the problem, drain the old oil from your injection tank before you add the new Yamalube oil. If the problem doesn’t correct, it could be due to other factors including:
~Spark plug too cold
~Oil injection pump adjusted incorrectly
~Air filter is soiled
~Carburetor adjusted incorrectly
For information on fixing these common problems, check online or with your mechanic. Most problems can be fixed without professional intervention.