Start wr450f and it runs for a minute and the exaust glows red out of the manafold
SOURCE: Exhaust glows bright red.
These bikes dont like to idle for very long. If you ride at a reasonable pace, it shouldn't glow for long. If it persists... Your jetting is too lean. Check out thumpertalk.com for a pictorial step by step how to re-jet
SOURCE: Derestricting 05 model wr450 exhaust
Usually pull exhaust pipe off at cylinder head and remove a restricting device there.
SOURCE: EXHUST DOWN PIPE GLOWS RED HOT AFTER BEEN RUNNING
Perfectly normal mate, a 4stk will boil if you leave it ticking over for any length of time.
SOURCE: 04 yz250f pipe at motor glowing red hot
Any reason you had to change the jetting??New pipe,Intakes.?But,even though you may have it a bit rich on idle the pipes WILL get very hot,very quickly without some sort of air flow over the front of the motor and radiator.At the very least,have a strong fan blowing directly on the front of the motor if you are going to let the bike run and you are not riding it.I have seen the white plastics in front of the radiator distort from the radiant heat.Don't idle them for in more then 20 seconds.It can do heaps of damage.Ride the bike and see if its running well.When you stop,turn it off.All the yz and wrf will get very hot at idle.Hope this helps
SOURCE: Glowing RED exhaust pipe
try a bigger jet or its going to cause some damage. You can pull the choke on to get some more fuel in to cool it .
Check that the cam timing hasnt been played with, some change the exaust cam by a tooth to copy yz specs, on top dead centre, there is a little arrow on each cam that lines up with the rocker cover surface
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