Re: Primary Cover (outer) - Are there more than 1 type?
I realised the 'flanged' cover didn't fit a long while back after I'd spent a few days preparing, spraying and lacquering one to go on the 1947 Girder fork M21 I was building at the time....Doh!!....Ian:laughing:
Re: Primary Cover (outer) - Are there more than 1 type?
I have a spare “flanged” primary cover destined for a Bitsa M20; it appears that it would be simple enough to cut the flange flush with the cover lip and have a good fit. (?)
I’m assuming someone has tried this at some point as the flanged covers are more readily available.
Re: Primary Cover (outer) - Are there more than 1 type?
The flange is spot welded to the cover...Drilling out the welds would allow it to be completely removed though the resulting small holes would have to be welded up afterwards...
If the flange was cut back to the edge of the cover that would leave a thin strip of material the thickness of the flange still welded to it..Though visible I shouldn't think the remaining piece would be at all obvious with a little filler applied before painting...Just keep away from rivet counters...:laughing: ...
If the bike isn't to standard specification the cover can be fitted with the flange only partially cut away to clear the breather casting on the crank case...Ian
Re: Primary Cover (outer) - Are there more than 1 type?
I have had more than a few genuine WW2 WD M.20 outer chaincase covers over the years, some with damage and others appearing good. The general comment from those whom I have asked to repair holes in some has been the metal is extremely poor quality steel. I had one in particular that looked good but discovered it was porous with a constant film of oil on the outside of the chaincase.
I suppose that is how it was at the time - if it did not require top quality material you did not get it.