Wow, out of the box your transfers are better than mine. Mine point about 10-15 degrees toward the exhaust on the exhaust side (intake side is good though). Your corrected transfers are much larger and at a better angle now, I bet that thing screams compared to stock, especially with that giant exhaust port. I was actually considering removing the transfer walls in order to gain more flow but apparently the disturbance from the piston would just screw up the flow, not to mention the transfers arent completely uncovered anyway so it wouldnt do anything for me. What sort of intake are you using? You said you run a YZ80 pipe, but if you're using a stock carb/intake you could probably gain a ton with a larger carb, and even more top end with some arrow reeds and a boost portAlright so your going to wanna sharpen the wall on the T port sides of the base of the cyl. You can see the first pic on my junk cyl that the cyl wall is jagged and not smooth or arrow dynamically sharp.
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With the base of the T ports ported as well with the case ported the same will gain a lot better flow and more.
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I also have a pic of a weed eater engine cylinder to show that there isn't even wall in between the T ports.
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Ouch man, the rings are good though?? That looks like something snagged and got dragged along the cylinder. Maybe note the ring gap positions and see where they line up with the ports, perhaps they're different than ours (ours are designed so they dont run by any ports, maybe your exhaust port is too big?)View attachment 64299
Unfortunately this is what happened when i first started it, about a minute of running it... cyl was well lubed so there was no dry start. I may have revved it too high too soon. My mistake so now i gotta get yet another cylinder and do it all over again! yay!
Is there no such thing as nikasil plating in china?