I have an '07 700 raptor with a K&N filter, Monster Duals, and a Powercommander. I am using the pre-loaded map from TQS, has always seemed OK. So, today I installed my Koso EGT, and the results are alarming. The EGT went up to over 1400F at idle. Now, I expected catastrophic failure around 1300F, so over 1400 seems like it would be total devastation. I pulled the plug and it's black, , not sooty, but black, , no signs of aluminum though. My thoughts are: is it possible I'm getting a bad reading? As the EGT went up 900, 1000, 1100, 1200, 1300, 1400, , the idle never wavered one bit either way. I would expect that if it was eating itself up, the idle would have been effected one way or another.

Now, one of the reasons I put an EGT on is because I ride right at sea level and often when it is below freezing or even below zero. The last time I rode, I noticed a bit of glow in the pipes, but it was super dark at the time, I didn't think much of it.

Any ideas of how to tell if it is leaning out of not? any help will be appreciated. Thanks.

 

if the plug is sooty at idle its rich, which maybe the cause of high egt cause the unburned gas is burning in the exhaust pipe. just a thought.

 

Thanks for the reply Jay. I never thought of fuel burning in the pipe raising the temp, , I was guessing a lean condition. The plug isn't sooty, but it is black. I don know the machine NEVER overheated when I rode, the fan didn't come on much, even in the summer. It did come on occasionally, , but it wasn't constantly on.