I have a 1981 Honda C70 passport engine that I rebuilt over the winter, did a top end job on it. Put it all back together and now there’s some ticking noise coming from the clutch side of the bike. When putting the right side engine cover back on, I kinda crushed some of the clutch components in there since I did not install it right, and I’ll be getting new parts for it soon. I’ve been trying to diagnose the ticking/knocking noise. Definitely is nothing related to the valves or piston slap, and it’s definitely not rod knock. I’ve been able to diagnose it to something with what I did with the clutch.
While inspecting everything, I had the right side cover off again, and when I spun the crankshaft, the outer race of the crank bearing was spinning slightly when I moved the crank. And when you pull on the clutch and push on it, it moves in and out slightly. I also have a 1981 C70 parts engine and it does the same, with the outer race spinning and the crank moving in and out the same amount. I’m assuming this is normal and this bearing is not a tight fit to that case? Hopefully it’s not a spun bearing? Seems to be normal since I have two of these engines and it does the same thing on both of them. Maybe when the motor gets hot, the bearing will expand and hold itself in place? Really hoping it’s not a spun bearing.
While inspecting everything, I had the right side cover off again, and when I spun the crankshaft, the outer race of the crank bearing was spinning slightly when I moved the crank. And when you pull on the clutch and push on it, it moves in and out slightly. I also have a 1981 C70 parts engine and it does the same, with the outer race spinning and the crank moving in and out the same amount. I’m assuming this is normal and this bearing is not a tight fit to that case? Hopefully it’s not a spun bearing? Seems to be normal since I have two of these engines and it does the same thing on both of them. Maybe when the motor gets hot, the bearing will expand and hold itself in place? Really hoping it’s not a spun bearing.