And while this thread is active, I'll add a note on fitting a saver to 750 cases.
This applies to later type 750 cases with external clutch slave.
I managed to squeeze a proprietary case-saver behind my std, 15T gearbox sprocket but it was damn tight.
Occasionally I reckoned I could hear the chain scraping the saver when the engine was on the overrun and the top run of the chain was slack.
Witness marks on the saver confirmed this.
However, I decided that it wasn't a major issue and left things as they were.
Then last year, as I was about to set off for the TT, I noticed a couple of shiny,worn areas on the chain where the saver scraping had been most severe .. possibly due to a minor tight spot in the chain, even though the chain was generally in decent condition.
Having no time to investigate further, I crossed my fingers and set off for the Island.
Luckily, when the chain snapped I was only 50yds from my tent at Kirkmichael.
I have since resorted to fitting a 14T gearbox sprocket and there are now no more clearance issues between chain and casesaver.
In the light of my experience I would not recommend fitting a casesaver to late 750 cases if the std 15T sprocket is retained.