Moin moin. I reactivated my Rex 50 Bj96 once again. It stood for a year because of a piston eater. The reason for this was or is a defective oil pump. I bought a 50cc aluminium cylinder kit and drive my scooter since 1:50 self-mixed.My problem:The scooter suddenly takes on only bad gas during the ride and then goes out. After 2-3 min it starts again. what could this be?The following things I did on the scooter:New aluminium cylinder new petrol filter r Carburettor with ultrasonic cleaned new spark plug (Standart spark plug ) Do I need a more heat-resistant spark plug?