Post by pvlietstra on Jul 7, 2008 0:06:28 GMT -5
I never owned one, but i was negotiating to buy an M21 and rode it a few times(see pic). Good fun and very slow. If you retard the ignition when riding up a hill, you do not need to gear down. It just pulls at 1000 rpm. (but runs hot!)
When retarded, the ignition occurs after tdc. This combined with a compression ratio of 5:1 and side valve arrangement makes for easy starting with the exhaust valve still open.
If you lift the valve too far on a ohv engine, it may interfere with the piston. I would not consider attempting to start with the exhaust valve open an option.
When retarded, the ignition occurs after tdc. This combined with a compression ratio of 5:1 and side valve arrangement makes for easy starting with the exhaust valve still open.
If you lift the valve too far on a ohv engine, it may interfere with the piston. I would not consider attempting to start with the exhaust valve open an option.
