Jim H.
I have seen here thanks to these guys, the correct most sure way is to pull the head and wire brush it off. unlike an automobile they are simple to do .
For the price of a head gasket cant beat the cost either.
Compared to automotive heads a Cub Cadet is a cake walk! No kidding. That carbon build up might be more. I have seen on two out of two build up that was more like a "clinker" from a coal furnace. But instead of the blue - purple colors it was orange - yellow. The guys that know said that was most likely from fuel additives. But the stuff is rock hard and not what you think of as carbon build up. I just found an otherwise good piston that had about two inches of it's edge taken out from this stuff. Also before you finish take 10 minuets and adjust your valves. This sounds like a lot of work to a novice wrench. But if you have done top end work on cars this is just so much easier with the end result being the same. Good luck and let us know what kind of crap you find under the head.
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