Hello, a few months ago, new crankshaft bearings and a new cylinder were installed on my scooter (NRG Power). When picking up from the workshop it only jumps very badly (but when it was on it ran without problems and I thought nothing about it, cylinder was finally new). Nevertheless, I suspect that the engine pulls wrong air somewhere, I checked the carburettor and the ASS, 100% leakproof. If I keep the air filter input the engine still runs, norm The connection between the carburettor and the air filter box is also tight (in addition to fixed with cable ties). So only the Simmerrings remain, these have also been newly installed, because there is the probability that a new Simmerring is leaking? That candle picture is right so far, since I have re-set the carburettor, makes me only stunned that the engine is still running even though I hold the air filter box? I hope someone can hold me help.