BTW, engine weight.
Engine, with drive and all needed bolts, standoffs etc.: 4812 g (10,58 lb)
Ignitions: 224 g (0,49 lb)
Total ready to run weight: 5036 g (11,07 lb)
When it´s fitted with exhaust system my guess is, that the weight is about the same as a Moki 250. Not too bad.