Frame diferences between 750s and SF1

[Smartv11]

I notice 750s and early 'knee pad' SF seem have a 'straight line' running along tank edge and seat base, while later SF1,2 etc seem to have the seat 'kicking up' slightly?

Is there a different frame with seat rail raised on later SF's?

Paul

 

[Paul Marx]

The 2 frames are completely different but I think seat rails are horizontal on SF1/2/3.
Main diference in frames concerns the engine mounting points, the engine being more tucked in on the SFs than on the S, making the plot more rigid. Same goes for the across swingarm brace which appeared on the later S, the earlier bikes would twitch their arse a lot.
Paul

 

[71Laverda750SF]

I notice 750s and early 'knee pad' SF seem have a 'straight line' running along tank edge and seat base, while later SF1,2 etc seem to have the seat 'kicking up' slightly?

Is there a different frame with seat rail raised on later SF's?

Paul

Two totally different seats, metal pan for the early SF's (weigh a ton) but fiberglass for the latter ones. The SF1/2 seats fit the early ones but the slots in the front to the fiberglass do not engage the frame tangs that hold it down, and there is a painful gap between the tank and seat front  :-[. There is a bit of a rise on the later ones but other than the hold down tangs the frames are pretty much the same. I have had the fiberglass seat on my '71 for 30 years but found an original seat to get it back to normal (though a few pounds heavier).

Clay