I cannot understand why such a simple things as engine overheating was not fixed.
If everything is connected as it should be and if there is coolant in the system and there is no clogging, and thermostat and thermal element are both functioning, I simply fail to understand why it should overheat.
Incredible. And you work in a Kymco workshop? Isn't there anybody who could help?
Yes; they've helped me the last two years -- the
first time, the gaskets were replaced under warranty. That time, the engine was not overheating, but it
was leaking oil. So okay, we all thought "defective gasket." Life goes on!
Forward just under a year, and
the overheating shows up. We replace the radiator cap, the thermostat and the thermosensor, and still no joy. A test with
a kit similar to this showed the presence of exhaust gases in the cooling system, which was a valuable test -- the next part to suspect was the water pump, which is all but impossible to test, and a pain to replace (requires removing the engine, and splitting the case). At no time was anyone able to smell antifreeze, or see any coolant leaks with the bike running or parked for days at a time.
Now, I'm back to where I was last February, only the overheating is worse -- one mile of riding, and the temperature gauge is pegged at full-on hot. Again, no detectable leaks of any fluids. So the consensus is that I have one or more slightly-warped components -- head, cylinder or engine case -- which makes sense to me, as replacing the two gaskets that sandwiches between these three parts will resolve the problem for almost a year. Over time, the exhaust gases get past the fresh, fat, tight gasket(s), and into the water jacket, because the mating surfaces aren't perfectly flush with one another.
Could this be
fixed? Yes -- with a lot more labor and the expense of a machinist involved, versus simply swapping in a near-new engine. Since I have around 23,000km on the engine, I think the latter option is a far better course of action.
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