The pistons of the 1200 have 3mm less compression height compared to the stock 750 pistons.Suppose they had used 1200 Mondials, in which case the pockets were not suitable for the elettronica’s bigger valves and different valve angle.
Marnix
I have 1200 pistons in my long-stroke GTL, and yes, the valve pockets needed to be modified, even for the small valve 750 head.
To make them work in a 750, either a longer stroke or longer conrods are needed.
piet


