Maintenance & Technical > KX500 Original

coolant question

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2001KX5:
If your head gasket is going then it could be blowing into your coolant. Check your coolant with the bike running for bubbles, and check it for an oily sheen when not. Also make sure there are no pin hole leaks in your rads that could be letting very small amounts of fluid out that yuo woudlen't really see behind all the muddy mess that usually gets on them.  I had that problem on my last KX250.

I used "Water Wetter" in my turbo charged honda civic and its amazing stuff. It will def be going into the kx when I'm ready to refill the system. It also acts as a lubricant and prevent corrosion.

FuriouSly:
   Boiling radiator fluid means too high a temp.  This is generally caused by running too lean, lugging the engine, riding with the wind, dirty air filter, and water pump impellar damage or failure.  If your bike was fine before the problem, look to the impellar/air filter.  If it is after a rebuild or new part addition, look to the jetting.
   More than likely the fluid loss is from the over temp and dumping fluid out the overflow when riding and you not noticing it. The lower level of fluid is from boiling it out, not neccesarily a leak in the cylinder or rad cap failure.
   As noted before, pin holes in the rads will lower the fluid levels without being very obvious, especially if they have built up dirt on them.  If you don't "keep it clean", it's hard to catch the little stuff before it gets big.  Also look to the radiator tabs that mount to the frame or shrouds.  The heavy vibration of the KX5 and laying down the bike will cause some stress on these areas.  A leak may start there as well.

Sly

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