Cylinder bore

heres a set of 741 cylinders bored out to 2-7/8" sport scout size.
the max is supposed to be 70mm or 2-3/4" but these cylinders were obviously in service.
It gives hope to rescuing old cylinders but then SS pistons have a lower CH 1.525" so low comp.
741 = 1.65625"

https://www.ebay.co.uk/itm/Indian-741-7 ... 4331225357

[Dusty-Dave]

Wonder what stroke and rods they were running? Id always heard that 2 7/8" was a surefire recipe for broken cylinders. Even seen pictures of a few blowed in half. Those obviously ran a while though. I've got a 741 with Sport scout wheels n rods with GS850 pistons that has been rock solid and runs right on down the road.
Dusty

cant possibly be SS stroke. would have to be 741 stroke and limping along with low compression.
I measured 1925 cylinder and is the same as 741 cylinder dimensions so 2-3/4 is normal bore max.
the Junior scout has the same cast as the early scout


because of low compression , possible candidate for super charge ?

[Dusty-Dave]

Why can't it be 3.5" stroke? I've got a SS lower in a 741 With no problem finding 69 mm pistons with the right compression height but if you wanted to use the SS pistons a .250 stroker plate would be in order. But even though they got away with 2.875 on that set it seems to generally be a very bad idea.
Dusty

yea , cylinder height diff