Jack & Heintz Twin

 

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The Marman Co. sold out to the Jack & Heintz Co. and they made the Jack & Heintz Twin Bicycle Motor. The Co. was called the Jack & Heintz Precision Industries, Inc  in Ohio.  They improve on engine by incorporating two compression releases in the heads the valves where activated by a two cam lever and pulled by a cable up to the left hand twist grip. The next improvement was two twist grips as opposed to Marman using a thumb lever. Left for compression release and right hand for throttle. Next was the carb which was changed from Tiltiston to Carter. Coil was also changed from a bakelite covered shell two an open varnished coil winding style which gave huge problems. Neither of these two kits came with lighting. 

Dave Bagne

Jack & Heinz by Ron Dow Jack & Heinz by Ron Dow Jack & Heinz by Ron Dow

This beautiful Jack & Heintz Twin by Ron Dow

From Dave Bagne's Collection

Dave Bagne's Marman Twin Dave Bagne's Marman Twin Dave Bagne's Marman Twin  Jack & Heintz

Dave Bagne's Marman Twin Dave Bagne's Marman Twin Dave Bagne's Marman Twin Dave Bagne's Marman Twin Dave Bagne's Marman Twin

Another one from Dave Bagne

 

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Jack & Heintz Twin 31/4 hp 2 cycle on a Rare S-10 Schwinn Bike. Made for engine kits. Engine on this bike is like N.O.S so was a real pleasure to restore & a nice performer. Of all the frames that Schwinn has made I consider this 24" bike to be one of their best in handling & comfort of ride. Gene Bollmeier of IL is now the proud owner & will complete his collection of the Marman & Jack & Heintz. Dave Bagne  Hutchinson Minn.

Jack & Heintz Twin

Thanks to Mickeybike.com

 

Background is Highway 101 in Santa Monica Ca. in the 1950s