"Well, that explains it", he said, wiping the egg from his face once again . . .
DSCN0170 by
Chris Conrad, on Flickr
That's busted. Here's how it's supposed to look -
DSCN0172 by
Chris Conrad, on Flickr
DSCN0171 by
Chris Conrad, on Flickr
So I went and did my "go-zin-tas" on this.
I was using a 948 Bugeye master and slave cylinder combination ("Frogeye" for those across the pond). Both the master cylinder and slave cylinder are .875" diameter, yielding a one-to-one ratio. So for every ounce of fluid forced out of the master cylinder, the slave cylinder receives one ounce of fluid. Therefore, for every inch of travel the master cylinder was depressed, a corresponding inch of extension was achieved to actuate the clutch fork.
The 1275 clutch arrangement is different. The master cylinder bore is .70" diameter and the slave cylinder is 1.0 - a .7-to-one ratio. So one inch of travel of the master cylinder translates to .7 inches of travel from the slave.
Why the difference? The 1275 utilizes a diaphragm style pressure plate - the 948 Sprite, a 3 finger arrangement -photo courtesy of Moss Motors - just don't tell them they extended me this courtesy . . .
190-963_2 by
Chris Conrad, on Flickr
I was pushing about 40% more fluid into the system than the mechanicals were able to handle, and that's why the clutch failed.
I'll be figuring out the engine management a little later this winter.