The S.p.A. Fratelli Daldi & Matteucci motorcycle factory was at Ufficio Commerciale Moto, Via Pirelli 16/A, Milan, Italy.
Daldi e Matteucci Motori (DEMM) began in 1953 in Milan, Italy. Their mostly 49cc two cycle engines were used by other marques, such as Legnano and Testi. In the mid fifties Demm produced a 49cc model called a Dick-Dick. In the late 1950’s UK, Bert Fruin built his own motorcycles and used the Demm 3M engine in his racing machines. The “Fruin Dartella” bikes raced in the Isle Of Man TT and at many other UK circuits. The 49cc 3-speed manual grip shift highly modified Demm Dick Dick engine also achieved a speed record of 89mph, according to Sheldon’s Emu.
Demm was first imported and distributed in the US by ZSN (Zelloe, Sgro, & Neiner, Inc. 351 S Raymond Ave, Fullerton CA 92635 USA), from late 1976 to about 1978. The Demm Scout, with stainless fenders, came from an eastern US distributor, somewhere, possibly ZSN east, PO Box 3176 Annapolis MD 21403 USA. There was also a Demm Smily 2, with ape hangar handlebars and a high back solo seat. All of the Demms in California USA are the Smily model, with white gas tank and fenders. Some of those are labeled as “Grycner”. They were distributed by Grycner Leisure Group (aka Grycner Motors Corporation) 301 Tamarisk Rd, Palm Springs, CA 92262 USA. Grycner is also a two or three wheeled Taiwan made moped with a Sachs or Minarelli engine.
Here is the genuine excellent line drawing exploded view of the Demm one speed automatic moped engine. It is similar to a Minarelli V1. The piston assembly interchanges Minarelli but the individual rings do not. The clutch looks similar. The clutch shoes/weights are the one-piece-molded kind, like Benelli.
Demm Smily components: Demm 1-speed engine 1.5 hp, Dellorto SHA 14/12 carburetor #52 jet, CEV bullet headlight, CEV round chrome switches, Domino chrome controls, Grimeca hubs and 90mm drum brakes, CEV magneto, CEV or Huret speedometer with LH driver.