Lazair Ultralight powered by Pioneer 100cc Chainsaw 5.5hp Engines?

[Armilite]

The initial model Lazair Ultralight was a single-seater with a 36.3-foot (11.1 m) wingspan and was powered by two 5.5 hp they were either 90cc or 100cc Pioneer chainsaw engines, directly driving plastic propellers in tractor configuration. I think they were called a Model 61.

Does anyone know the Spec's of these Model 61 Engines?

Were there any Big Bore options for these?

Does anyone make a Tuned Pipe for them?

Thanks
Rich

[weimedog]

http://www.acresinternet.com/cscc.nsf/ed1d619968136da688256af40002b8f7/7a507cf1c2b66a4a88256b00001f7653?OpenDocument