MF135 Perkins Gas Compression results

The #2 cylinder had very hard carbon deposits built up around the lower portion of the spark plug hole such that the 1/2 hole was constricted to about 1/4-3/8 in. I bored it out carefully by hand with a series of drill bits 1/64 at a time until it was fully open. I kept the bits oiled to 'catch' the particles as best I can. Most were very small.

Questions: What do you think of these numbers? Will what little carbon particles that fell into the cylinder cause a problem? What was the likely problem that caused the buildup in the first place ..rings?

Thanks for your input....

I did not overhaul my MF135 and have only acquired mine last Fall as my first tractor, so I am no better off than your friend.

Wish I could be more help.

BTW... My tractor is loud an noisy in general and I doubt whether a faint, tinny sound could be heard.

Still, my experience with machinery in general suggests to me that when I hear a sound as you describe it is generally two pieces of metal that are not part of the engine that are vibrating at a very high pitch in close approximation so that they don't appear to be moving. Does the noise persist or change in any way when the engine is revved up or shut down?