May 22, 2012, 07:30:16 AMLatest Member: harley101

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Author Topic: tech help yfz 450  (Read 1070 times)

challenger

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tech help yfz 450
« on: October 02, 2011, 06:57:04 PM »
Is it  normal for a pipe on a 07 yfz 450 to glow red ‎
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JTMoney

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Re: tech help yfz 450
« Reply #1 on: October 02, 2011, 08:01:17 PM »
4 strokes do get hot.  I'm assuming its the head pipe thats glowing.  Maybe richen the carb up a tad.
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Nordie

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Re: tech help yfz 450
« Reply #2 on: October 02, 2011, 08:10:18 PM »
My 4 stroke would glow big time....bike was tuned perfect...you gotta think that pipe makes a 180 out of a serious sized piston turning 7k plus rpm!

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crewchief22

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Re: tech help yfz 450
« Reply #3 on: October 02, 2011, 09:21:50 PM »
The headpipe on my '08 WR450 glows red also.
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Re: tech help yfz 450
« Reply #4 on: October 02, 2011, 09:47:46 PM »
Normal for a factory head pipe... not so normal for a thicker aftermarket one.

Though I would do some wide open runs followed by a spark plug check to be sure. I've seen people down jet stock bikes for no reason at all...
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the.perv

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Re: tech help yfz 450
« Reply #5 on: December 13, 2011, 01:52:00 PM »
Quote from: challenger on October 02, 2011, 06:57:04 PM
Is it  normal for a pipe on a 07 yfz 450 to glow red ‎

My YFZ did since it was new. You know after hard riding.
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mash on it

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Re: tech help yfz 450
« Reply #6 on: December 14, 2011, 08:22:19 AM »
My old azz XR600 glows both pipes near the head, and its stainless head pipes. Glows more after a highway or fast desert run, especially in the summer. timing is stock, but the carb has been rejetted.

Thats all I got
Daniel
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Your Mom

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Re: tech help yfz 450
« Reply #7 on: December 14, 2011, 08:34:53 AM »
Just ride in front of all your friends at night...
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kahon

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Re: tech help yfz 450
« Reply #8 on: December 15, 2011, 05:48:17 PM »
My 05 glows red and burns my pants every year. Last year they caught on fire ! Gonna put an exhaust wrap this year .....Im tired of burning my pants .;)

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454spectra

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Re: tech help yfz 450
« Reply #9 on: February 07, 2012, 05:34:48 PM »
A lot depends on tune.i have a yfz450 with nmotion pipe kit and other mods,had it dyno tuned and I do think I'm more on the lean side for power,but when I ride at night it will glow red.my raptor 700 with duals and a power commander doesn't tho.
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Re: tech help yfz 450
« Reply #10 on: February 08, 2012, 07:11:19 AM »
No its not. You might be running a little or a lot lean. I would up the jet size in your carb. The head pipe should be hot as hell but not glow red.

I have done many 100 mile races and rode my bike hard and never noticed it glow red. But maybe it would a little if it was dark out.
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Havasukona455

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Re: tech help yfz 450
« Reply #11 on: February 08, 2012, 07:52:13 AM »
no its normal for them to glow red. i have an 06 rmz 450 and with the compression on them they run hot. i would recomend throwing some engine ice in the radiator. keeps it a lot cooler. you dont tend to see the header pipe on a 400 quad or lower cc glow red because they dont have the same power. it is normal but you can try rejetting to reduce it.
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AQUAHOLIC

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Re: tech help yfz 450
« Reply #12 on: February 08, 2012, 08:33:38 AM »
I ride a honda 450X with race motor. Port polish, high compression, titanium exhaust, the works. never saw it glow red.

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SoCalPSD

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Re: tech help yfz 450
« Reply #13 on: February 08, 2012, 09:57:20 AM »
Go up a few sizes on the jetting, I had the same issue. come to find out some bikes sold on the west coast were down jetted from the factory. My Bike came with a 130 I believe and it was suppose to have a 140 range. Now its got a 164, I pulled the spark arrester an no more red and the low end pulls harder. Jets are only a few bucks and it only takes 10 mins to change.

Fat fingered from the phone-Corey
« Last Edit: February 08, 2012, 10:00:58 AM by SoCalPSD »
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pw_Tony

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Re: tech help yfz 450
« Reply #14 on: February 08, 2012, 02:15:02 PM »
I've built 20+ yfz motors, 15+ Raptor motors. Both bikes will have glowing red pipes from hard 100% load runs, the stock exhaust tubing is very thin. Aftermarket exhaust should stop that, but it also has to be upjetted for the exhaust.

Stock yfz is a 155 main jet
Should jet to a 176 or so with a pipe and K&N.
210+ for built motors, but they should be dyno'd.
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