I was in the middle of rebuilding the top end and found that there is a small section of the exhaust port missing. I just bought a new piston and ring and went ahead and put that all onto the connecting rod ready for the cylinder and head. My question is...stupid as it may be, how bad would it be to run the bike without part of this bridge? I've been working on this bike ('98 YZ 125) since I bought it 2.5 weeks ago. Now I'm upset and don't know what to do about it. I don't want to spend another 250.00 for a new cylinder. What are my alternatives? Thanks in advance!