SoCal Jet Boats
Tech Talk => Engine Mechanical / Electrical => Topic started by: challenger on October 02, 2011, 06:57:04 PM
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Is it normal for a pipe on a 07 yfz 450 to glow red
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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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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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The headpipe on my '08 WR450 glows red also.
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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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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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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
Mash on it
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Just ride in front of all your friends at night...
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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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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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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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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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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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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
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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.