MVVS 45MG (43cc) with plug, prop washers, bolts and nuts: 45.5 oz ( 2lbs 13.5 oz)
This includes a built in mount. In my application I did not need standoffs.
Ignition -- 5.6 oz

TOTAL - Motor - 50.1 oz (3lbs 2.1 oz)

Muffler - KS 60cc canister + 12" KS header = 12 oz.

Hi Bob,

I did a survey like this years ago for 40-50 engines, but I did not include the standoffs(unless engine required them), muffler, battery or switch because I figured these are installer specific and not engine specific.