The water jacket is on the out side of the cylinder and in side the out side casing.
If you are wanting to know what is in the water it is anti freeze.
Jacket
C. Convection
C. Convection
The 1600 cc (cubic centimeter displacement) in the VW Type 1 Beetles are horizontally opposed 4 cylinder air cooled engines.
Air cooled, much like the old "hit and miss" farm engines.
Almost all of the first aircraft engines were air cooled as this made for a lighter engine.
The firing order for all air cooled VW engines is 1-4-3-2, the cylinder numbers are spelled out on the cylinder sheetmetal near the spark plugs.
1.6 air cooled 1.9 air cooled 1.9 water cooled 1.6 diesel subaru engines loyal with less fitting 2.5 with more fitting there is good rebuilt engines on eBay air cooled but oversized like 2,1 L
No, all engines cool by radiation.
Many engines use a Heat Sink. The most common are air cooled engines like a lawn mowers, or some motorcycles. The metal fins you see around the spark plug and the cylinder are heat sinks. A heat sink just provides additional surface area for the heat to be exchanged with the cooler temperature of the air.
SAE 10w30. I recommend synthetic for all air cooled engines.
The last YZ250 that was air cooled was 1981. 1982 is when they switched to water cooled engines.