Head Pipe Glowing Red

[Kurly154]

I put my stock pipe back on and started it up. It was idleing and then the I saw the head pipe glowing red. What would cause this?

[cals400ex]

a glowing header is normal. now, that does not mean your jetting is right but it isn't saying your jetting is way off either.

[krt400ex]

it is only normal if it is not really bright and u r only noticing it at night. otherwise ur bike is running hot, which would indidcat a lean condition

[Kurly154]

The jets are main 122 and pilot 38. The stock jets are main 125 and pilot 35.

[krt400ex]

do u have a slip on??? cuz u r running lean, at least go back to stock. then u could go from there

[Kurly154]

I am at stock. The only thing I have on it know is a k&n filter.

[krt400ex]

Originally posted by Kurly154
I am at stock. The only thing I have on it know is a k&n filter.


well then, u r lean. if u r going to keep the airbox lid on, u will be ok with stock jetting. so go back to that and start from there. if u r planning on running it with the lid off, then u will prolly want to go to like a 127 main, or something like that. the pilot, i would leave stock. i dunno why it is that much richer than stock. thats the size of a 400ex pilot. tooo rich. go back to stock and u should be all better

[Kurly154]

If I put the stock main back on and leave the 38 pilot should I be ok? The stock pilot is a 35. The stock main is a 125. I am going to put my full exhaust back on soon.

[krt400ex]

ya u will be, but u will be rich off the bottom...and if u put a pipe on it, u will need to go richer still.

[morfy]

My bike at idle in the dim lite of most arena tracks glows a bit.. Once you get moving it should go away.. If you took your lid off why a smaller jet??

[Kurly154]

I changed my main back to a 125 but my pilot is still a 38

[krt400ex]

then u should be fine now. but when u put that pipe on make sure u go to like a 130 main

[400exrider707]

If your talking about the stock headpipe on your 250X you are lean. A stock headpipe is steel, and require a lot of heat to glow red.

Morfy your bike you mean two wheels? Most stock dirt bikes have Titanium head pipes which will glow a lot easier.

[krt400ex]

Originally posted by 400exrider707


Morfy your bike you mean two wheels? Most stock dirt bikes have Titanium head pipes which will glow a lot easier.


yup, they will glow real easy cuz they r thinner, alot thinner

[Kurly154]

I'm not talking about a dirtbike. I'm talking about a 1987 Honda TRX250X Fourtrax.

[400exrider707]

Well go back and read the post, because I was talking about your 250x headpipe. You are lean, it is not normal on a steel headpipe.

[Toadz400]

Okay, let's do this the right way.

What mods are you running or are planning to run? What's the temperature there? What's your elevation? Why did you go to a leaner main jet when you put on a K&N filter?

[deathman53]

it sounds as you are lean. What is the color of the plug? I use 127 in my 200x, and that is almost spot on, you are too lean. the plug electode should be a cardboard brown color, white its lean, black its hot. I put my jetting alittle rich as it runs cooler, but does foul plugs some.

[Kurly154]

I'm running a dg pipe, K&N filter with airbox lid on, and a 125 main jet. Its ranges from 30F to 65F. I do not know the color of the plug but will check that on sunday because I will not be home tomorrow.

[Toadz400]

I'd probably go up to a 130 main or possibly larger and richen up your needle also.

im running 148 main :chinese:

[Toadz400]

Originally posted by Kickstarts_Suck
im running 148 main :chinese:

What mods are you running? What's the temp? Elevation?