Just picked this thing up. Looks like it has a total of about 5 hours on it..tires look brand new. Gear oil was clean, but had the Afro On the drain plug.. This is it clean. I opened screw on water pump this all that came out. Pulled tank, opened radiator cap. No bueno. Water pump outlet clogged. Pulled hoses. Flushed with garden hose. I fired it up. Ran pretty good for not running in fifteen years. Still leaks from cap. I filled it with water and vinegar, as per other inmate suggestions. Anybody have other suggestions on cleaning coolant system? Also frame is rusty, what should I use? The frame is chromed? Anyway , any help would be appreciated. Thanks.