C15 Engine plates for B31 frame

[Alderley E]

Hi, does anyone know someone who supplies plates to fit C15 Engine into a B31 frame?
Or anyone that has done this?
Thanks Colin

[DAVE BRADY]

Hi Colin,

I cannot imagine anyone having such plates in stock or ever having fitted a C15 engine in a B31 fame.  Assuming it is a swinging arm frame then as it was used for B31,B33, A7, A10 and right through to Gold Star and Rocket Gold Star in various trims so really designed for more powerful engines.  The frame is quite heavy for the 350cc B31 so I would imagine that a 250cc C15 would be very underpowered even if you got the drive lined up.
Is it a challenge you have taken on or do you want to have a usable bike at the end of it?

Dave.