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Old 09-19-2010, 06:47 PM   #1
Dirt McGirt OP
Joined: Jun 2007
Oddometer: 50
OHH MAN!?! DR650 header glowing red

Well I guess I should start by saying that I had been experimenting with which jets and mixture settings worked best for the old DR. This was while it was alot hotter and alot more humid here. I got it to where it seemed to be working about as good as I could get it.(pretty darned good)

Now the weather has changed and it is a whole lot cooler and less moisture in the air.

I have the 170 main jet, clip set at the #4 from the top of the needle slot. I had the mixture screw set at between 3/4 and 1 turn out.

The instuctions that came with my extended mixture screw from kientech said to set it between 3/4 and 1 1/8 turns out.

The paperwork that came with the dynojet kit says 2 1/2 turns out, which seems to be way too rich in everyone's opinion, including mine.

Now the issue, I just came out of my dad's house after letting the bike sit for over an hour. The bike was cold enough to need to be choked to idle.

After less than 2 minutes(of idling) the header was glowing red, never in 4 years have I seen this happen.

This made me real nervous, but once I fattened up the mixture it seemed to be back to normal.

Anybody had this happen before?

Is it semi-normal?

Is it easy to fry a motor this way?

Anything I should be worried about?

Anybody care to give me your thoughts on this? Thanks guys Dirt

Dirt McGirt screwed with this post 09-19-2010 at 07:03 PM
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Old 09-19-2010, 07:07 PM   #2
Wisconsin Airhead
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Joined: Nov 2004
Location: Madison WI
Oddometer: 3,482
take this over to thumpers and the dr650 thread and you'll have better luck with the right answers

"Between two explanations, choose the clearest; between two forms,
the most elementary; between two expressions, the shortest."
Between two motorcycles the simplest (DW)
Eugeni d' Ors (1881-1954); Spanish writer.

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Old 09-19-2010, 07:45 PM   #3
Gnarly Adventurer
Joined: Dec 2007
Location: Beltsville, Maryland
Oddometer: 344
It happened all the time on my old Yamaha WR400 when I let it idle. I never liked the idea of it glowing, so I tried not to idle very long. But in my opinion it is pretty normal on big bore four strokes.

I think a lot of people don't notice that their thumpers are glowing red because they seldom ride at night. The glow can be seen in daylight but obviously not as easy as in the dark.
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Old 09-19-2010, 08:58 PM   #4
not normal
Joined: Jul 2010
Location: west central Florida
Oddometer: 493
I've seen the glowing exhaust thing. idling excessively does that. basically what it is, is that you have all that exhaust heat building up, and no airflow to help carry said heat off, so the pipe begins to heat up and glow.

doing this isnt GREAT for your engine, try if you can to keep air flowing over it. overheating it may cause damage you dont even want to realize can be done so easy.
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Old 09-19-2010, 10:01 PM   #5
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Joined: Dec 2008
Location: A national park somewhere
Oddometer: 217
glowing is normal no worries. Happens on all my bikes. Like stated previously, most people just never ride at night so they dont see it.
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Old 09-20-2010, 07:38 AM   #6
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Joined: Sep 2008
Location: Moncton,New Brunswick
Oddometer: 4,353
Originally Posted by Jrmobb
glowing is normal no worries. Happens on all my bikes. Like stated previously, most people just never ride at night so they dont see it.
+1 normal.....won`t hurt a thing,no airflow cooling the header.....mine will glow red when idling and the oil teperature is only 200 degrees,so the engine itself is not really hot..

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