Wr 400 Overheating!!!
Posted September 23, 2009 - 11:51 AM
Posted September 23, 2009 - 12:35 PM
-The coolant is not the right mix. Maybe the previous owner just added water instead of a mix of water and ethylene/glycol. Just drain it all and replace it.
-The circuit needs pressure to work, so if you have a leak, it will not cool properly. this also would explain why the coolant is'nt flowing back from the overflow tank (you need a closed circuit and under pressure for that). leakage could be at the radiator, the hoses, the cap, or inside the engine. If it's the radiator or hoses, you would see water dripping when you stop riding. The radiator cap being no longer functional you would hear a hiss when the engine get's hot (before taking off the cap). Finally, if the leak is in the engine, in most cases you get a white smoke coming out of the exhaust, or water in the oil when you drain the engine of it's oil (milky oil). Dealers have a special tool/pump to test both the cap and the circuit pressure.
-Last but not least, the water pump might be broken. If you don't have any of the symptoms above, this would be the most obvious reason. What I would do (not sure this is the right way) is drain the liquid, remove the water pump housing, and check the bearing, shaft and impeller for damage. Move the kick starter slowlt to see whether it turns OK.
Most of these problems are easy and cheap to fix, except if the leak is in the engine or the impeller shaft needs replacement. In these cases you need to take the engine apart. A leaking radiator you can either replace (expensive) or have it welded (cheap)
Hope this helps...
Posted September 29, 2009 - 04:55 AM
Posted September 29, 2009 - 08:05 AM
Posted September 29, 2009 - 04:52 PM