In a word, no..........well, some parts are but not the crankshaft assembly.....
WD versions have a smaller crankshaft assembly (narrower) that used 1/4" rollers that were 21/64ths long..............whereas post-war beefed-up the crankshaft assembly to take 1/4" rollers that were 1/2" long...............as such, both may be interchangeable as complete units but not individual components...........
The post-war crankcases were also "beefed-up" internally by omitting the "gaps" or "webs" on the internal casings so this may or may not affect interchangeability...........they look identical externally however.......
The blueprints for changing the above were actually drawn up in mid-1943 (I have the original factory drawings) but were shelved until post-war civvy production commenced. Perhaps the one unknown matter is the last 1,500 WD Flea's were cancelled by the War Office so it is unknown IF these were built up as civvy machines but retaining the WD crankshaft assembly or built using the revised version....
As for pistons, some early original pistons have "deflectors" cast in to the top whereas later ones omitted these.........all are interchangeable however for all years...........
Civvy cylinder barrels went over to a clip-fitting stub for the exhaust pipe whereas WD versions were threaded to take a clamping ring........other than that they are the same.............
WD magneto covers are plain without any lettering......post-war civvy had "Royal Enfield" cast in and had the slots to attach the cover (to vary the ignition advance) replaced with holes to fix the assembly in one position.............
The remainder of the engine components are the same between WD and civvy......gearing , primary case and clutch all being the same.........note that the WD version had a one-tooth larger rear sprocket however..........
Good luck on finding the ignition points assembly ! Impossible to find today and only used on the Flea and, seemingly, a model of Sarolea.....fortunately, I have a set or two.......
WD versions have a smaller crankshaft assembly (narrower) that used 1/4" rollers that were 21/64ths long..............whereas post-war beefed-up the crankshaft assembly to take 1/4" rollers that were 1/2" long...............as such, both may be interchangeable as complete units but not individual components...........
The post-war crankcases were also "beefed-up" internally by omitting the "gaps" or "webs" on the internal casings so this may or may not affect interchangeability...........they look identical externally however.......
The blueprints for changing the above were actually drawn up in mid-1943 (I have the original factory drawings) but were shelved until post-war civvy production commenced. Perhaps the one unknown matter is the last 1,500 WD Flea's were cancelled by the War Office so it is unknown IF these were built up as civvy machines but retaining the WD crankshaft assembly or built using the revised version....
As for pistons, some early original pistons have "deflectors" cast in to the top whereas later ones omitted these.........all are interchangeable however for all years...........
Civvy cylinder barrels went over to a clip-fitting stub for the exhaust pipe whereas WD versions were threaded to take a clamping ring........other than that they are the same.............
WD magneto covers are plain without any lettering......post-war civvy had "Royal Enfield" cast in and had the slots to attach the cover (to vary the ignition advance) replaced with holes to fix the assembly in one position.............
The remainder of the engine components are the same between WD and civvy......gearing , primary case and clutch all being the same.........note that the WD version had a one-tooth larger rear sprocket however..........
Good luck on finding the ignition points assembly ! Impossible to find today and only used on the Flea and, seemingly, a model of Sarolea.....fortunately, I have a set or two.......
[/quote]Hi Steve
Thanks very much for that excellent breakdown and info , thats helped no end
Reason I ask I'm intending on building up some spares to keep on the shelf, so at least if something gives up the ghost I'll hopefully have it on hand
Thanks again Steve
Dave