There are 13 dzus fasteners that hold on the upper cowling. Take the cowling off and check everything, including the coolant level. It doesn't take me 5 extra minutes during the preflight. I only use the little door on top to check the oil for the same day return trip.
I use a stubby flat blade screw driver. Dzus keys are available but not necessary. I check the bottle to insure the tube is in correctly and fluid present. I open the radiator cap (some say I'll wear it out, I do it anyway) and insure fluid is in there. All hoses secure. All plug wires secure. All electrical wire connected, no discoloration. Engines mounts, exhaust, carbs, and generally the overall condition.
One thing I have learned about the oil cap, Dave, is that the 'joint' between the gold center disc, and the silver cap should be lightly lubed with motor oil so that when you turn the cap, on or off, the center gold disc (bout dime size) should NOT turn. The gold disc is connected to the gasket underneath, and this should not be turning while cap is coming off or on. Have seen one Rotax engine lose it's coolant that way in a PS. I think the replacement cap was $88!!
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