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quadracing

newbie to 4-stroke need help

7 posts in this topic

Well I just picked up a new left over 2005 yz450f and I have only rode it around for 10-15min so far it seems like it is really really hot....exhaust header is turning blueish....is this all normal of a 4 stroke....how do I know for sure it isn't running to hot??? thanks for all your help guys.

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The header turning blue is normal if you run the bike fairly hard. Most pro's can turn their pipe blue in a matter of laps but for the rest of us it can take a bit longer. My bike always feels very hot when riding compared to my old two-strokes, just normal for 4 strokes I believe since they create alot more heat than 2-strokers.

Also, it should be noted if you let the bike sit and run for more than 1-2 minutes the header will glow orange/red which is normal, air passing over the pipe when riding cools it so you won't see this but doesn't if you are standing still.

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yea i just got a 06 crf450r and when i first started it up the pipe changed colors no big deal, they can overheat quick though if u just let it sit thier you will start to see coolant come out the overflow hose

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Ok.....Thanks for all the help everyone....I just wanted to make sure I wasn't hurting my new baby at all....LOL

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Yeah, 4 strokes rule man. Keep an eye on the coolant though. If it is loosing a lot while you are sitting after a short ride, you may need to rejet; but most likely, you're okay.

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