Hello, A few years ago I picked up a Scott crankcase at the Mannheim autojumble in Germany. The seller was from Latvia. The engine number is ” FL 3244A “. The FL prefix isn’t shown in the Scott book. The number is clearly shown on both sides of the casing and I’m sure has been there from new. Any ideas ? The main bearing area is different from the norm and it has the very hard old remains of a rubber oil seal. More pictures can be posted if you are interested. Nick.
Although I’ve never seen one of the FL prefixes I would take a guess as Brian mentioned that they were stationary engine crankcases. With FY and FZ the F meant a 68.25mm stroke but the Y giving a 600cc and the Z a 500cc, letters which ID’s later engines of those capacities too.
However… there were LFY and LFZ numbers issued in the early-mid 1930’s. Just to confuse matters they had a 71.4mm stroke.
So as a guess I would say the FL was a short stroke stationary engine of niether 500cc or 600cc, perhaps less than 500cc. Knowing what Scott was like perhaps a 68.25mm stroke and a 66.6mm bore to give a low revving high torque engine favoured in stationary applications.
Thanks to both of you for that theory. I had never thought of it being from a stationary engine. Maybe that’s the answer ? I think my TT Rep. has also decided it’s engine is a stationary unit, as it refuses to make noises ! Well, that’s not quite true. The other day it refused to start from cold. It had plenty of fuel getting through, good spark etc. In the end I gave up. I went over to it today, didn’t touch the fuel tap or tickler and it fired up first kick and sounded fine. Bl–dy bike, but I do love it though. God know why. regards, Nick.