Yz400f Question Help

[bobbo55]

I Need Help I Have A 99 Yz400f And Every Time I Start It My Header Just Outside The Motor Gets Glowing Red Hot Just After About 1min Of Sitting. Is There Somthing Wrong. What Can I Do To Fix It If There Is Somthing Wrong

 

[Ol'89r]

My Header Just Outside The Motor Gets Glowing Red Hot Just After About 1min Of Sitting. Is There Somthing Wrong. What Can I Do To Fix It If There Is Somthing Wrong

bobbo55.

Those bikes are not designed to sit and idle. If there is not any air flow through the radiators they will overheat very quickly. The headpipes are very thin and many of them do that. You may be able to help it a little by re jetting the carb.

Just my $ .02

 

[blanc]

No they just do that...hey even my klx250/300 does that.

 

[Jaybird]

You can always wrap the header pipe. Some folks advocate doing this on all thumpers for a couple of reasons like increased exhaust velocity, as well as rider comfort.

https://secure.srcinc.net/prodpage....cted=ceramic&StartRow=1&Product_Selected=1675

 

[Hick]

Be careful if you use header wrap, it can trap moisture and lead to premature rusting of the head pipe.

Anyway, the header is probably always hot enough to glow after a few minutes of idling, but is only noticeable when in the shadows or not in broad daylight.

 

[rasta]

yz 400f help

your bike might be running a little lean too