DF 150 - high idle speed - buzzer warning

[orohde]

I just changed battery. The motor started but the idle speed did not go below 1300rpm. The buzzer started to beep, but not combined with any lamps on the rpm instrument. This case is not described in the owners manual. What could be the reason for the high idle speed and what does the buzzer tell me when it beeps "alone".

The motor has been out in freezing conditions for a couple of weeks. Thats why I changed battery. the capacity was ti low in cold weather.