After conversion to 172ccm it starts well, but does not bring any power with ignition oscillation

Hello together, first of all a short introduction – am the Bayerwolf and owns a Gilera Runner 125 FX D/T, year 1999. I wanted to take advantage of a piston damage and installed the Malossi conversion kit on 172ccm. First everything fine, jumped wonderfully, first warm up and wanted to drive the first meters, he did not bring any power – the more gas, the less – and also constantly had ignition oscillations. Because of the oscillations I have now new: clearly the spark plug e, the spark plug plug and the CDI ignition unit. Now slowly but surely the ideas run out, but the power drop with the ignition dropouts is still there. Do you still have some and who can help me from you. Who really thanks you for useful advice and tips! Thank you in advance already to the community The Bayerwolf