I just bought this pair of skis and they have been sitting for years the were owned by a older man that passed and they sat for yrs the look like brand new. What shoul be done before I fire them up They have fresh gas new battires I would think the carbs and plugs need cleaned. But The big ? Is how is the oil system on these skis and should I leave them hooked up or can the be disconnected The Yamaha looks like it is vacum driven pump off the intake looks like it would be easy to DC and go to pre mix I just wont these oilers to fail and blow one up .