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I have an 06 Polaris RMK 900. I recently was riding and my sled started backfiring and bogging down. It now won’t start. Sometimes I have spark and sometimes I don’t. I have replaced the ECM, new plugs, new coils, new voltage regulator, new stator and new flywheel. I’m still not able to get it to start. Some days I get spark and it will start. Some days it won’t. Any suggestions would help. Thanks! Snow is falling and I’m stuck at home!