Defective cylinder head | Questions and answers among users

enzobarrett1971 · 2026-06-09T19:42:12.274000Z

I bought the first Polini 70 cylinder kit in October 2025. After 3 months, the circlip on the left side of the wrist pin came off and I destroyed everything. In February I bought the same cylinder kit. At the end of May, the booster stops. I open the cylinder kit and the same defect: circlip on the left side in the crankcase and the cylinder broken and the piston destroyed. What should I do?

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