Bored out version of the C15 which was only reliable when used mildly but loads of the things left over from army use, so many modded hacks still going strong. Some very nasty, vibratory, oily heaps on offer at the lower end of the market. SS90 had sporting clothes and a little more power but not exactly inspiring. It’s hard to find something good and easy to end up spending loads of dosh rebuilding the motor.
1960-65 343cc (79x70mm) OHV single 22/25hp, 80mph, 75mpg 300lbs