info on 1990 polaris 350 2 stroke

graham · #1 (**permalink**) 02-09-2012, 07:50 AM

I have a 1990 magnum 350 2-stroke, coolant is leaking from a small 1/8 hose on top of the crankcase just behind the pull start when running at higher rpm's, at this connection is this some type of pressure valve or overflow valve ?
What is its purpose ?
Why is it pushing out coolant ?
Rad cap seems good
I have bled system of air
Coolant resivoir has no leaks
Rad has no leaks
I have contacted dealers,they have told me many different stories.
Its the rad cap
An air lock
Crankcase seals
Water pump seal

Looking for answers,any help would be greatly appreciated

**Bruce!** · #2 (**permalink**) 02-09-2012, 08:16 AM

Welcome to the board!

macka · #3 (**permalink**) 02-09-2012, 08:20 AM

Welcome to the forum. The sad part is any one of those answers you were given could be the fix. They are guesses without seeing the quad. I'd post the question in the magnum section of the board. IIRC the rad cap has a pressure releif valve in the cap and you can test it in a bucket with some boiling water. It should open to allow coolant to flow into the overflow.