thought Martyn and a few others might like a look at this taken from bike exif site not sure if the purist will but its keeping old bikes alive in a different form .
Now I like that I have never played with the Triumph singles closest being the 350-500 twins I put one of them motors in an sp 370 back in the early 80s it made a cracking little play thing I did some bad things to lot's of old bikes in my time. but brit stuff was cheap back then parts of old bikes was in the back of barns shed's all over the place an could be had for very little money. I remember putting the grinder through that Model Twenty One frame just to get the motor out to this day an yes it was a 500 she had sat in a old damp shed with mud floor for years the wheel rims had turned to powder all the tin ware was lost to Mr rust the old boy took £25 pound off me for that.