1951 Sun Motorcycle

[Newzmitch]

Hi, I have a 1951 Sun Motorcycle 122cc that I would like to get any
 information / photos on please, As in New Zealand there is very little
 info to be found on these motorcycles. Frame number is RMc 772 H,?
 Engine number is 935/207680, thanks for your help,
Cheers Mitch

[rogerwilko]

http://www.cybermotorcycle.com/euro/brands/sun.htm

[33d6]

Hi Mitch,
Old British lightweights can be very difficult to identify as many of them bought their components from the same sources and once the transfers on the tank disappear they get tricky.  I suspect you may have fallen foul of this old problem.
The identifying prefixes you quote for both the frame and engine numbers, RM and 935, appear to be those for a 1951 125 Francis Barnett Merlin so I suggest a photo is in order to clear up any confusion.  The relevant prefixes for a 1951 Sun powered by the same engine are PMC-S for the frame and 941 for the engine.
A photo would help a lot as the Fanny Bee and Sun engines are totally interchangeable and you could possibly have a Sun with an engine from a Fanny Bee. Mixing and matching was a common thing when these bikes were daily riders but can be confusing when trying to sort out what you have 50 years later. Spares and info are very easy regardless of what make it finally turns out to be.
Cheers,