So you're saying after three litres of fuel your engine is in that bad of shape? The engine in question was an FMS right? That sounds pretty fgar fetched but not impossible by any means if a( your fuel was no good (seen tha) b(your air filter is no where near as good as you thought it was c( improper break in and not preheating before firing engine
I have cranks on all types of engines that don't measure that small that have 6,7,8 gallons so this is by no means normal
Pm or email me if you have any Q's
Happy motorin',
Monty