I don't have a scale that will weigh it accurately but the info is available from Carr. I am using battery CDI to keep down weight and keep the engine compact. I don't have the ability to post pics at this time but the porting is impressive. The ports nearest the exhaust
are very large and should be extended into the crankcase. With the proper pipe I also think this engine can get into the 5-7 hp range.
It will require matching the crankcase to the cylinder and judicious porting. I think the secret is moderation.

I have built race engines in the past that broke track records just before they exploded.

My long shaft engine with crankcase lightened to the max, less prop hub and exhaust, appears to weigh approximately one kilo.