Is this one of the very rare 3 cylinder OHV/SV BSA photoshop models? Ron
email (option): ronpier@talk21.com
['They wanted to see if they could build a machine with a dynamo as inaccessible as a G3 !'...']
Impossible, even with photoshop...
...Ian
email (option): ian@wright52.plus.com
you fooled me...
email (option): maartenengels@hotmail.com
I had a complete Y13 750 given to me years back in the mid 70's when they weren't worth a lot and I didn't really appreciate that sort of thing anyway...
I got it running (just) and swapped it for a Royal Enfield Interceptor engine...I was running a R.E. Constellation myself at the time..
Seemed like a good deal back then.. 
....Ian
email (option): ian@wright52.plus.com
Don't know if you can spot the difference from a picture, maybe from the diameter of the cylinders.
What I do know is that the 500 had the rods side by side with a-symmetric conrods to bring the cylinders back in line. The 750 had a plain and forked conrod like V-twins should have..
Very nice engine!!
Would have been difficult to run this combination since the engine is reversed and would turn in the wrong direction even if you could get the gearbox turned around 180 degrees. Normally the magneto is in front. This is the timing side showing against the drive side of the M20.
Regards,
Leon
email (option): leonhop3_at_planet_dot_nl
Exactly so Leon. That is why I posted a link to a picture from a Dutch guys site. Ron
email (option): ronpier@talk21.com
I din't think I need another such project Mike.......But never say never I suppose
Ron
email (option): ronpier@talk21.com