Overheating

[derek300ex]

Just got my yfz about a month ago, had a Honda before and decided to make the switch... Like it so far!!! But it seems to be over heating. The pipe is turning cherry red after like 15 or 20sec. Of idling. I've heard it's normal but it shouldn't be getting like that, that fast should it???? I'm running ingine ice in it and im even running it alittle rich. I orderd a new spal fan for it but I'm running out of ideas... Need some help and some info of why it's getting hot so fast!! Thanks

[guy310]

The head pipe being red has nothing to do with engine temperature, it is the exhaust gas temperature. The head pipe is thin walled pipe and when you're not evacuating that gas it gets hot. Nothing to worry about.

[derek300ex]

Even when it's turning red in a matter of 10 seconds or so??

[guy310]

pretty much. yes. If it was genuinely overheating, i.e. the coolant is no longer removing the heat from the engine, you would see the coolant system pressurize and come out of the overflow catch can back on the subframe. Nobody ever really notices the headpipe thing because they mostly ride during the day but ride it at night and it is scary the first time you notice it. At least it was for me.

[XCRacer236]

It does it cause it's lean.

[guy310]

a yamaha will do that no matter what pilot jet you have in the carb. It is not because its lean or rich. It does it at idle.

[derek300ex]

Well it's turning bright red in the day time and you can see it perfectly. But y'all know better then I do. And it's deff not runnin lean. Actually running it alittle rich. My other 450 did the same thing and that was cause it was lean and I fixed that

[XCRacer236]

Think whatever you want. I richened mine and it went away.