Hard residue in exhaust

[Tbone07]

This is what I found in the header of my exhaust during my tear down for the winter. It doesn't look normal to me

Now I did suck in quite a bit of dirt and water on my trip to WV, due to my shitty air-box setup. How much I sucked in i'm not sure




Some pics of the piston

[C-Leigh Racing]

Y'all see what the inside of that pipe looks like, now wonder where those scratches came from on the piston skirts & bore wall. Now just think, how confused that wave travel is as it travels back & forth through the pipe.
Neil

[Pumashine]

Now just think, how confused that wave travel is as it travels back & forth through the pipe.
Neil

:thinking:

It is ugly inside there. Time for a SC Tbone07 and you won't have the extra sludge gumming up the pipe.

[Tbone07]

:thinking:

It is ugly inside there. Time for a SC Tbone07 and you won't have the extra sludge gumming up the pipe.

I know i'm running pretty rich, but i've run richer on bikes before and never had an exhaust that looked like this.

[Jerry Hall]

Take the pipe to an automotive rebuilder that has a hot tank.  Dirt can cause the inside of the pipe to look like that and so can castor two stroke oil when the engine is not being run real hard all of the time.  If you ran enough dirt through the engine to cause the pictured build up, your rod bearings, piston, and bore would probably already be history.

The top of your piston shows to have been running a little on the cool side.  The cool piston crown could be caused by being rich or just not holding the throttle wide open for more than a few gears at a time and then giving it 30 seconds of rest by idling around between full throttle blasts.

[udontknowme]

given enough time your gonna see build up in the exh regardless what oil. might see more or less carbon depending what kind of oil, what ratio, how the bike was ridden and how the tune was.

[Tbone07]

Take the pipe to an automotive rebuilder that has a hot tank.  Dirt can cause the inside of the pipe to look like that and so can castor two stroke oil when the engine is not being run real hard all of the time.  If you ran enough dirt through the engine to cause the pictured build up, your rod bearings, piston, and bore would probably already be history.

The top of your piston shows to have been running a little on the cool side.  The cool piston crown could be caused by being rich or just not holding the throttle wide open for more than a few gears at a time and then giving it 30 seconds of rest by idling around between full throttle blasts.

This is exactly the type of riding I was doing on my last trip, virtually no wide open riding and tons of idling and putting around. I was also running castor 927 at a little richer than 32:1.

My piston and bore actually look pretty good. I'm throwing another piston and rings in it this winter for safe measure.

[broken1]

Wow, your pipe looks like my chimney before I swept it. Are you burning fir for fuel?

[StrokedAZ]

^^^lol