why do.................

[bristolmod]

TV175 pistons have windows and other models only have cutaways??

[Rich_T]

Because the gudeon pin is further up the piston the skirt is less supported. The ring around the bottom of the piston supports the skirt.

[Muppet]

I few of the 200 pistons came with windows instead of cutaways.

[bristolmod]

interesting point re the strengthening element..........However, I've just stripped down an SX150 engine, and that piston (OE fitted) has windows as well

Chris