Q. How this engine is able to produce similar power to RE's 500 cc mill being lesser in displacement than its 350 sibling - 42 - 42 - 42?

There's a difference on short stroke and long stroke engine which is why jawa 42 produce more power just like the sports bike it's nothing like pure cruiser or roadster it is just a sport bike with the body of vintage retro bikes where as Royal enfield bikes are pure cruiser or roadster.

Technically better performing engine , hence you gets 27 BHP

RE fan cant believe if some one did better power with lesser displacement engine....