Since mine only gets run in summer months, only use water. Hate the sticky feel of coolant if any maintenance needs done. Plus having to get rid of it. Every fall drain radiator and remove plugs on cylinder case. Then run a few min's jic. As far as filling/burping , i drilled two 1/8 holes in stat. And also leave cap off till up to temp. Then add to "full when hot" mark.
x2 for Jim
I would not run with 100% water as that just guarantees corrosion. Also, I would flush it with antifreeze if you want to empty it in the fall. Water caught up in the block could cause a heave when the water freezes.
If you leave cooling system empty then you have air and water creating corrosion inside your engine all winter.
Think it's better to leave 50% solution in the engine cooling system. I started my engine in the spring and fall for more than 30 years and never had a leak or engine failure. Just a body panel corrosion problem
