Burn Color Inside the Pipe

[boondocker97]

I just made an observation when I had the pipe off of my 900 pro-lite. After riding it for a couple hundred miles the whole inside of the pipe and can are an even cardboard brown color like a good set of plugs should be. I've never noticed this before on my other sleds. Most of the time it is some shade of black. I'm useing the Cat synthetic APV oil that I have used in every other sled I've had.

Anyone else seen this before? Not worried about it, I'm assuming it is just a sign that the fuel map is tuned pretty close to where it should be. Only other time I have seen this was on the piston domes of my 4 stroke race quad when it was tuned in perfect, but that is not burning oil like a 2 stroke is.

 

[9071000]

I would check the y-pipe and cylinders,if they look good '''no worries.personaly I like to see oil in the y=pipe.

 

[Thunder101]

I only see oil film about 1 inch in Y pipe from piston face

 

[summ8rmk]

From my experience. If u shut the engine down at full operating temp and pull the pipe, its nice and dry and brownish color. If u start the sled up and pull it into the shop to tear it apart, its all wet and black inside.

Ridin da Yamacat