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The wear at the top of the cylinder is from "piston rock" as the crank goes around top dead center the piston rocks and wears right through the nikisil. I've done it with my motors and seen it on others. Totally normal on a high hour engine. Happens faster if you like to bounce your motors off the rev limiter.

You have excessive wear and scratches on the piston skirt and cylinder. Your air filter is not being cleaned enough or has poor fit and or quality. Dirt is getting through.

The timing chain guide I dont know.

No point rebuilding the motor if you are not going to do the oil mod. Could take as little as an hour to seize a new crank. Riding a track does nothing to help get oil onto the rod bearing.
 
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