Your pistons should be cam ground, which means their largest diameter is opposite the pins. That area is also major and minor thrust for the combustion event. While I cannot see the depth of the scoring; cold start hard running (not letting it warm up) and/or overheating can cause this. This is probly not the source of the noise. I assume the noise was at crank speed? I also assume you didn't see copper on any of the bearings, but did you plastigage the mains and rods? Tedious yes, but you need to know on start-up if the knock will be gone. The wrist pins can't be too loose. Lightly oiled, you should not feel any looseness as you rock the rod in the piston. Did you check the flywheel for looseness? Did you check for adequate oil pressure cold and hot? And was the knock deep sounding or a rap on acceleration. How the knock sounded would give you a lot of information. Since a shop ruled out injectors could it be carbon. They can give a rod type knock. Stick to your evidence. Hope this helps. Gerard
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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