1. The coolant capacity is approx 1.1 litre
2. Battery is located under the rider seat (same as earlier 390)
3 & 4. Same oil pump configuration as the earlier 390 - google for the 'self study manual/SSM duke 390' and 'workshop manual' on the 390. Here is a link to these documents: Check page 19 of the SSM for lubrication circuit.
If you find some information contrary to what I've posted, please clarify.. would help everyone.



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