would this be a problem ?

[paul.jameson]

I have had the same hole in one of my sets of cases. I can't tell you which set but it might even be the current set in my Red Hunter. I have not experienced any issues as a result of the hole.
On my 1957 VH in the seventies I broke the drive side cast iron flywheel which I put down to the use of a ball bearing as the timing side main bearing instead of a roller bearing. I believe the extra flexibility of the ball bearing caused the flywheel to flex more than it was designed to do but I will admit to a high compression piston, big carb, etc at the time of the breakage. So I would not use a ball bearing on the timing side in a 500cc engine.

[nevhunter]

Failure of those LATER cast wheels is NOT uncommon Paul. The weren't ARIELS Finest Hour. Maybe a BSA Plot, Nev

[Vincent.vanGinneke]

Thanks all.
I think the main advantage of a roller bearing would be that upon closing the crankcase it's easier to slide the roller in it's outer ring compared to a ball bearing that already sits in the TS.

[Vincent.vanGinneke]

Xmas Nothing else to do today, so I made a few washers.
0.16mm aluminium sheet.
if anyone needs one let me know.

[nevhunter]

The trouble with unshouldered rollers is the Outter sleeve can come loose in the case when the engine gets very hot and come out till it hits the flywheel. Nev