I just bought a 86 TY350 that's in excellent condition. It's has a Falcon mono shock and a aluminum silencer but appears otherwise stock. The previous owner claims it has a new rebuild but the bike wouldn't start.
I cleaned the pilot jet and noticed the needle has a funny shape, almost a bulb on the tip of the needle. I assume this is normal? Anyway, after cleaning the carb it started up and runs great EXCEPT, a horrible knocking engine noise. I first thought it was the piston pin but after reading about "pinging", I now wonder if there's too much distance between the piston crown and head? I understand how to measure the distance but how much clearance is critical?
Thanks