here it is my simson s50 b2 completely transformed and basically a s51 now.. I'll answer any question! Been building it for quite some time now and im not done yet. :
Simson s50 B2 - YouTube
Pazoma Motorbike Steel Green Orange Gas Tank Motorcycle Fuel Tank For Simson S50 S51 S70 - Fuel Supply - AliExpress
Simson S50 B2 1978 - Duesen-Trieb.com
SIMSON S 50 B2 Baujahr 1979 in Rot :: Fahrzeugmuseum Staßfurt :: museum-digital:sachsen-anhalt
Simson S50 B in Senfgelb | Simson, Simson s50, Simson awo
SIMSON simso-s50-b2-elektronik-mit-tittenlampe-60-km-h-12-volt-anlage Used - the parking motorcycles