I'm not a mech engineer but I know that EB is generated by the compression phase in both 2 and 4 stroke engines.
On throttle the compression phase still exists but the expansion phase generates power that overcome this loss.
Sport motorcycles engines also have a huge compression ratio (over 12:1) similar to diesel car engines.
2 strokes have less EB because you have to compare similar power ---> smaller capacity values and these engines have no inertia coming from camshafts, valves etc.
On throttle the compression phase still exists but the expansion phase generates power that overcome this loss.
Sport motorcycles engines also have a huge compression ratio (over 12:1) similar to diesel car engines.
2 strokes have less EB because you have to compare similar power ---> smaller capacity values and these engines have no inertia coming from camshafts, valves etc.