cb360j
Been Around the Block
Background Story:
I’m newer to the world of Vintage Motorcycles, having had newer Ducati’s but never anything old enough that the dealership didn’t work on... shame on me as I’m an engineer and should be doing more. The bike is a 1976 cb360 I got from my neighbor for free, and I decided to just do a full rebuild.
I did all the frame work I wanted, put on a cool snazzy new seat and repainted the frame. Had the cylinders bored in order to put .50 over wiseco pistons in due to the rings being stuck to the old pistons. I am now in the process of reassembling the engine before I put it back into the frame, put the pistons in, cylinders on, head on, all bolted down according to spec.
Now it is time to put the valve covers on, I filled the oil baths with oil and put the gasket sealer from common motor collective, then proceeded to place the valve cover on and bolt it to spec. Before I put the valve cover on, the engine turned freely and I heard air coming from the cylinders. Obviously with the valve covers off, the rocker arms were not pushing down on the valves. The problem is that the engine will spin about half a rotation till it comes to a dead stop, not trying to bend a valve, I don’t push down on it any harder and I take the valve cover back off.
Here is my thought process so please help me with this and correct me where I am wrong: the valve cover off means the engine can spin freely with no worries of the valves coming in contact with the engine. When the valve cover on, the rocker arms push the valves down and cause them to come in contact with the piston causing the engine to not complete it’s stroke. Assuming the timing is off, or the valves need adjustment, Is this a problem I need to address with the valve cover off? If so, how do I go about this. Thank you in advance.
Here is some pictures of the bike in its current state in case y’all wanted to throw some opinions at that too Haha
I’m newer to the world of Vintage Motorcycles, having had newer Ducati’s but never anything old enough that the dealership didn’t work on... shame on me as I’m an engineer and should be doing more. The bike is a 1976 cb360 I got from my neighbor for free, and I decided to just do a full rebuild.
I did all the frame work I wanted, put on a cool snazzy new seat and repainted the frame. Had the cylinders bored in order to put .50 over wiseco pistons in due to the rings being stuck to the old pistons. I am now in the process of reassembling the engine before I put it back into the frame, put the pistons in, cylinders on, head on, all bolted down according to spec.
Now it is time to put the valve covers on, I filled the oil baths with oil and put the gasket sealer from common motor collective, then proceeded to place the valve cover on and bolt it to spec. Before I put the valve cover on, the engine turned freely and I heard air coming from the cylinders. Obviously with the valve covers off, the rocker arms were not pushing down on the valves. The problem is that the engine will spin about half a rotation till it comes to a dead stop, not trying to bend a valve, I don’t push down on it any harder and I take the valve cover back off.
Here is my thought process so please help me with this and correct me where I am wrong: the valve cover off means the engine can spin freely with no worries of the valves coming in contact with the engine. When the valve cover on, the rocker arms push the valves down and cause them to come in contact with the piston causing the engine to not complete it’s stroke. Assuming the timing is off, or the valves need adjustment, Is this a problem I need to address with the valve cover off? If so, how do I go about this. Thank you in advance.
Here is some pictures of the bike in its current state in case y’all wanted to throw some opinions at that too Haha