Hot header

luke99
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155
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GB
luke99
Edited Date/Time 4/23/2014 5:24pm
Just saw this picture on fb with no explanation can anyone shed any light??

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Big Lenny
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Compton, CA US
Big Lenny 4/21/2014 11:02am
4/21/2014 11:02am Edited Date/Time 4/21/2014 4:04pm
You need some air flow going thru that motor all 4's do that...
gharmon
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Valley, AL US
gharmon 4/21/2014 11:04am
4/21/2014 11:04am
Don't know about bikes but when car headers do that its and igniting timing problem
gharmon
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gharmon 4/21/2014 11:06am
4/21/2014 11:06am
and not its not a good thing, nor is it normal But hey car headers are not titanium either, so what do I know. Not much

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Chappy 651
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50
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7/28/2010
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North Chili, NY US
Chappy 651 4/21/2014 11:14am
4/21/2014 11:14am
its 100% normal if you rev the snot out of them not moving. its not reccomended but every one will do it going back to a 98 yz400
Titan1
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Lehi, UT US
Titan1 4/21/2014 11:16am
4/21/2014 11:16am Edited Date/Time 4/21/2014 11:17am
My 450 would do that idling in the garage...it was a jetting issue for me.
rbm33
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421
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Duncan, OK US
Fantasy
890th
rbm33 4/21/2014 11:20am
4/21/2014 11:20am Edited Date/Time 4/21/2014 11:44am
Start up any modern 4 stroke in the dark and thats what you will see.... check out thumpertalk there has been about a bazillion threads on it since 02.
shiftmx_22 4/21/2014 11:36am
4/21/2014 11:36am
You're only cool if your head pipe glows.

Big Lenny
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Compton, CA US
Big Lenny 4/21/2014 12:55pm
4/21/2014 12:55pm
Pffftt..Rookies...Dry

activeMX
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325
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7/19/2011
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Long Beach, CA US
activeMX 4/21/2014 2:01pm
4/21/2014 2:01pm
Totally normal, especially if the idle is high or choke is out.

Bikes need air flow to properly maintain temperature. Always makes me laugh when someone starts up their bike and lets it idle on the stand while they get their gear on. Nothing is worse for performance and durability than excessive heat in the motor.
Zesiger 112
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Galveston, TX US
Zesiger 112 4/21/2014 3:33pm
4/21/2014 3:33pm
If it's a titanium header it is because they are built really thin.
Grieby54
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Castle Rock, CO US
Grieby54 4/21/2014 4:05pm
4/21/2014 4:05pm
activeMX wrote:
Totally normal, especially if the idle is high or choke is out. Bikes need air flow to properly maintain temperature. Always makes me laugh when someone...
Totally normal, especially if the idle is high or choke is out.

Bikes need air flow to properly maintain temperature. Always makes me laugh when someone starts up their bike and lets it idle on the stand while they get their gear on. Nothing is worse for performance and durability than excessive heat in the motor.
Depends on how long they let it idle. I get dressed but put my neck brace, helmet, gloves, and goggles on after I've started the bike. It's better to let it get to operating temperature than to just kick it and rip.

I do get a chuckle watching people bounce their bike off the limiter to "warm it up" right after starting it.
lumpy790
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York, SC US
lumpy790 4/23/2014 5:24pm
4/23/2014 5:24pm
bent pipe toastage ..... but the hose did not fail!

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