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Originally Posted by xr88honda  but yes if you DONT see it glow after a few minutes of idle at night you should probally rejet it cause then you are too lean |
Sorry but your info is wrong... unless your referring to diesels where leaner is colder and richer is hotter! On a gasoline engine leaner is hotter and rich is colder... And it all has to do with material or the exhaust and thickness of the material. A mild steel chinese exhaust will not glow red at idle no matter how lean it is or how long it has been idling. There are many factors that control whether it will glow or not. Have you ever notice how some exhausts are "burn the skin" hot almost instantly while other systems on the same bike will stay cool for 30 seconds before the ouch factor happens.
Titanium exhausts will start to glow much quicker than stainless or mild steel because the material is thinner (... because the material is stronger*).
Also an engine at idle wont have a dramatic difference in temp because of jetting! There is no load on the engine, its idling where it feels happy with the a/f mixture, until you go past optimum mixture... kind of like the thread where people were arguing that turning your bike off by shutting off the fuel and letting the bowl run dry will hurt your engine!
Temperature when metal glows red | Hearth Wiki Is the head pipe supposed to glow?? - ThumperTalk is the head pipe supposed to glow red in the dark? - ThumperTalk