KX60 cylinder engine please help!!!?

My 2000 kx60 I was riding and I was being stupid and was staying in second gear at high rpms. I downshifted and the bike shutoff. It roll started in second gear for like 3 times then never did it again. I took off the cylinder head and the top of the inside of the cylinder head was killed. No doubt I need a new one of those. Then I took off the cylinder and it has one big gouge on the inside wall, but the rest of it was perfect. The piston was killed but I already have a new one to replace it. The connecting rod and bearings are worn out so I need a new one and bearings which is about 60 bucks. The cylinder head is about 50 and the piston was wiseco and came with all the stuff needed and that was 60. So im looking at new connecting rod and bearings, and a cylinder head. I could only find one cylinder for sale and it was 300 bucks! I am willing to pay top of 200 to repair this thing myself not including the piston price. So I am wondering how I could repair the cylinder for about 100. Thanks.